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207 Cards in this Set
- Front
- Back
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On the AR Boom hoist lever, what is the purpose of the FREEWHEEL position?
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It allows the boom to be flown by use of the ruddevators.
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When the boom hoist leaver is in the HOLD position, what position will the boom assume?
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FIXED
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How many switches are built into the boom control stick?
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3! 2 thumbswitches to control the interphone and microphone and the trigger to AR disconnect
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What are the length dimensions of the AR boom when retraced or extended?
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27ft 8in and 47ft 3in
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What six basic functions does the boom hydraulic system perform?
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Open the operator's door, hoists the boom, extends and retracts the boom, operates teh fuel bypass valve, opens the boom nozzle poppet, and furnishes pressure to the ruddervator's power units.
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How the slipway doors can be opened with both the open and closed lines pressurized?
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There's a larger area on the open side of the actuator.
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What item on the toggle actuator prevents the excessive system pressure on the pull-away of the air refueling nozzle from the receptacle?
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A spring loaded ball relief valve
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What are the three positions in order of sequence of the ARR indication system?
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Ready, contact made, disconnect
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In the CONTACT MADE poition, what supplies voltage to the toggle limit switch?
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Signal amplifier
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How are electrical signals transferred from one aircratft to another during hook up?
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Induction coils in the nozzle
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What position is the ramp placed for straight-in loading and off-loading of pallets?
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Horizontal
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When can you operate the cargo door and ramp from the pilot's ADS control panel?
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In-flight
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At what locations can the ramp and door be operated from?
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Pilot ADS panel, forward loadmaster control panel, and the aft loadmaster control panel
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During normal ramp lowering, why are the ramp close (up/unlatch) actuators energized prior to lowering the ramp?
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Removes the ramp weight from the latches
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What is the purpose of the toes that are installed on the aft end of the ramp?
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Loading rolling stock
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How is the cargo door and ramp manually operated?
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Using the manual solenoids on the aft loadmaster panel
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What station panel would you use to operate the cargo door/ramp manually?
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Aft loadmaster control
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How can you use the manual override buttons on the aft loadmaster's control panel?
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To assist you in troubleshooting/isolating a problem
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Why are the door mechanical shutoff vlaves mechanically opened?
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To port pressure to the cargo door actuators
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What component sense that the ramp is full up and allows the latch actuators to be energized?
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Up-limit position sensor
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What is the purpose of the override switchew on the aft loadmaster's control panel?
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Operating the door and ramp manually
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Where are the two locations that the bomb doors can be operated from?
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Pilot's and radar navigation station
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Can the bomb doors be closed manually without hydraulic pressure while airborn?
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What? No. Of course not.
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What provides hydraulic system pressure to the bomb doors system?
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Engine-driven hydraulic pumps for the left and right body system.
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What is the purpose of the pressure switches installed in the door close line between the main doo control valves and hydraulic actuators?
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Check for pressure in the close line after the doors are closed and latched
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What is the pupose of the dual shuttle valve?
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It selects either normal or emergency hydraulic pressure to operate the forward bomb bay door actuator
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What does the bomb door control valve ground check light indicate?
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A malfunction exists with the control valve and there's pressure in the close line.
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Before attemting to use any troubleshooting procedures, what must you do?
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Acquire as much information as possiblle about the malfuntion from all sources.
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What are the two possible faulty components if you are not getting pressure to the forward door hydraulic actuator, provided all electrical and mechanical paths are good?
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Forward hydraulic control valve or the dual shuttle valve
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What would be a simple way to check for hydraulic pressure at the close side of the dual shuttle valve?
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The pressure switch
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Why do nonpressurized reservoirs have space above the fluid?
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To assist the fluid in purging air bubbles from the system
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What prevens foreign material from entering the reservoir during servicing?
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Finger screens
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What are the two main reason for pressurizing a reservoir?
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Esuring positive fluid flwo, and preventing foaming at high altitudes
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How is a hydraulic pressurized reservoir serviced with fluid?
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A self-sealing filler valve
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What is used to prevent damage to a hydraulic pressurized reservoir during servicing?
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A relief valve
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What is the first thing you must do in order to service or perform maintenace on an air-pressurized reservoir?
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Depressurize
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What component in a pressurized hydraulic reservoir system controls the air pressure within safe limits?
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Air pressure regulator
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In an air-pressurized reservoir, where is the air for reservoir pressurization usually take from?
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Engine bleed air
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If either check valve inside the hand pump malfunctions, what would be the indication, if the pressure line did not have a third check valve?
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The hand pump would become inoperative
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What is a drawback of a contant-volume pump?
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The pump will eventually build up enough pressure to burst lines and containers
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What is the thineed portion on the drive shaft of a gear-type pumpe called?
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Shear section
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On a vane type pump, what keeps the vanes against the housing wall?
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Springs
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In the constant-volume piston pump, what drives the cylinder block?
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Universal links
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Why does a constant-volume piston pump always have a constant intake intake and output of fluid?
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There are always pistons between the upper and lower positions.
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What happens to the excess case drain pressure in a constant volume piston pump?
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It is routed back to the intake side of the pump.
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Describe the suction boost pump's impeller.
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A paddle wheel that slings fluid outward from the center
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What does the suction boost pump do for the engine driven pumps?
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Ensures an adecquate supply of fluid to the engine pump
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What regulates pressure in a variable-volume pump?
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An integral flow-control valve or compensator
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What is the main difference between a Vickers stroke-reduction pump and a constant-volume pump?
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The angle between the drive shaft and cylinder block
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When the system is at 0 PSI, the vickers pump's cylinder block and yoke are in what position to provide full flow?
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Extreme angle position
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Do the pistons have a stroke when the vickers pump reaches the ZERO FLOW point?
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Nope
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The Kellogg pump is made up of two major component groups. What are they?
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The rotating group and the pressure-compensating group
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What determines the Kellogg pump's length of piston stroke?
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The angle setting of the cam
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What is the purpose of the creep plates in stratopower pumps?
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Cooler operation and more even wear on the cam
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Describe the pistons of the strtopower pump.
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Pistons with fairly large hollow centers connected with cross-drilled holes.
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If the stratopower pump sense a pressure increase, what component is acted on to reduce the pressure?
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Compensator piston
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On the stratopower pump, which way would you turn the adjusting screw to increase pressure?
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Clockwise
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List the differences between a hydraulic pump and a hydraulic motor.
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Flow is directed into the motor rather that from it. The motor does not have a foot valve.
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What can be used to control the speed of a hydraulic motor?
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Flow-control valve.
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Explain the principle of a jackscrew.
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The screw turning causes the nut to move back and forth.
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Which accumulator has a drilled passageway in the piston for lubrication?
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Piston type accumulator
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Which accumulator has four separate chambers and 2 pistons connected by a rod?
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Self-displacing.
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What are the two distinct operations of a MOC valve?
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When closed, it acts as an automatic check valve. When open, the valve acts as a straight tube.
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List three basic types of shutoff valves.
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Manual, motor, and solenoid
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What are some common names for manual shutoff valves?
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Globe and needle
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What determines the purpose of the solenoid operated shutoff valve?
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Location in the system
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Which type of shutoff valve has an indicator to show if it is closed or open?
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Motor
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What causes the motor-perated shutoff valve to shut off when it reaches the fully-open or fully-closed position?
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Limit switcehs
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What are relief valves? What do they do?
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Pressure limiting devices that prevent pressure from building up to a valve that would burst the container.
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What is back pressure?
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Return line resistance
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How much fluid does a thermal relief valve relieve?
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A few drops
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What is the most common trouble you will find with relief valves?
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Internal leakage
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Which chamber of the self-displacing accumulator is serviced with fluid when the supply system is serviced with the hand pump?
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Storage
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What is the purpose of a compensator in a self-displacing accumulator system?
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It spring forces the fluid from the compensator
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In the self-displacing accumulator system, where is the relief valve located?
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Between the pressure line and return line
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What are the three basic parts of a filter assembly?
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Head, element, and bowl.
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Which part of the filter assembly is normally mounted to the aircraft?
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The head
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What is meant by micron rating?
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The amount of dirt or contaminates that filter
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What are the two ways fluids can usually flow through a fliter assembly?
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Bypass and normal
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Where are hydraulic fluid coolers normally located in a hydraulic system?
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Return lines
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Why is routing the hot hydraulic fluid lines through the fuel system advantageous?
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Heated fuel will burn more efficiently
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Why are fluid manifolds used?
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Common fluid lines can come together
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What are three basic parts of an automatic spring valve?
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Spring, poppet, and seat
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Why is the spring of a check valve relatively weak?
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It's only to keep the poppet against the spring
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Which type of check valve has a ball follower and what is it used for?
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Automatic check valves do to prevent the ball from cocking to side.
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When the manual-type poppet selector valve is in the neutral position, which poppets are on seat?
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All of the poppets
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If the cam on the manual poppet selector valve is poitioned 45 degrees from neutral, what will happen?
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One pressure and one return poppet will be forced from their seats
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Which one of the manual selector valves can be used as a metering valve?
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Slide
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Why are solenoid-operated valves used instead of manual valves?
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Solenoids permit the position selector valves
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Name two types of solenoid-operated selector valves.
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Slide and poppet
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What centers the control spools on either the poppet or the slide selector valve?
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Springs
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Why would you want to have a valve that is designed as a full-trail valve?
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When you want your alternating lines to have free flow back to return
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What does half-trail mean?
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Half the valves allow fluid to be trapped in the alternating lines.
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What is the major difference between a selector valve and a servo valve?
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The servo valve controls and directs flow.
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What are the three basic types of actuators?
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Single, double unblanced and double balanced
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How many pistons are found in a tandem actuator?
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2
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If a tandem-type actuator is used on the primary flight controls, will it be able to handle the aircraft if one system fails?
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Yes
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What is the purpose of the internal snubber actuator?
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To reduce damage to mechanisms
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Which direction of fluid flow controls the speed of the internal snubber actuator during extension?
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Outflow
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What function does an internal locking actuator serve?
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To prevent it from moving out of position
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What forces the actuator's lock balls against the detent?
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The plunger
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What must happen before the acctuator's lock balls are allowed to move out of the detent to unlock the actuator?
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Pressure must be applied to force the locking plunger away from the balls.
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What happens to the locking segments as the actuator piston retracts and applies pressure to the segment retainer?
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They spring behind the piston lips
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What is the difference between automatic and nonautomatic position control systems?
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Automatic positions itself back to neutral
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Which position control system has a follow-up system that limits the movement desired?
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Auto
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Which follow-up mechanism neutralizes a selector valve operation via a pinion gear hooked to an operation arm and uses a set of gears?
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Differential follow-up
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Which follow-up mechanism uses cables and pullies?
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Mechanical follow-up
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Which follow-up mechanism works on a servo loop principle and will send a signal to the amplifier that will hold the servo valve in neutral?
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Electrical follow-up
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Name two types of actuators primarily used for limited rotary motion.
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Nave and Rack & pinion
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What is the pinion of a rack & pinion actuator normally attached to?
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A moveable object
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On a vane-type actuator, which vanes are connected to the wingshaft?
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Moveable ones
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What is used to allow free-flow in one direction and restricted flow in the other?
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Orifice check valve
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What has a screen to prevent orifice from being clogged?
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In-line filter restrictor
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Which orifice can be adjusted?
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Variable orifice
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Which orifice(s) restricts flow in both directions?
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Fixed, variable, orifice check valve, and an in-line filter restrictor
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What is the job of a hydraulic flow regulator?
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Keeping fluid flow at a constant rate
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How are flow regulators rated?
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Gallon/minute
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What do flow equalizers do?
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Synchronize movement in 2+ hydraulically actuating cylinders
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What is the purpose of a quantity-measuring fuse?
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It stops fluid flow after a specific amount has flowed through
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What does the size of the orifice determine in a hydraulic fuse?
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The amount of fluid that will flow through the valve before it fuses
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Which type of fuse automatically resets
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Type I
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Which type of hydraulic fuse is held in the fused position by a lock spring and stop rod?
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Type II
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When would a hydraulic system need a pressure reducer?
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When full system pressure is not required
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How many ports does the pressure reducer have? How are they connected?
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Three: pressure, return, and reduced pressure
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What is one way you can tell if a shuttle has internal leakage?
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Excessive heating
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What are the three types of sequencing?
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Mechanical, electrical, and hydraulic
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Which type of sequencing unit is used for sequencing a mechanical system?
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Mechanical
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In a pressure sequenced system, what provides the sequencing effect?
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Priority valve/balanced relieft valve
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What is the purpose of the wivel joint?
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To provide tubing between moving parts
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How many times should you leak-test a swivel? What should you do to it while testing it?
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3 times, rotate it 360 degrees during the test
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What is the advantage of a balanced extension unit over simpler swivels?
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It will extend and retract.
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Why is a vent line filter installed on a reservoir?
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To prevent contamination
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What connects the reservoir to the suction boost pump and why?
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Flexible hose because of severe vibrations
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Why does the suction boost pump have a bypass line installed?
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Cooler operation
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If a fire occurs, what provisions does the hydraulic system have to cut off the supply of hydraulic fluid to the engine driven pumps?
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Firewall shutoff valves "T-handles"
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Briefly explain why a runaround circuit is used when the hydraulic pump shutoff valve is closed.
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It cools the fluid and keeps the engine-driven pump lubricated.
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How are the hydraulic supply lines to the engine-driven hydraulic pumps pressurized?
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Suction boost pump
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Before you start any in depth troubleshooting, what should you check first?
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Inspect the applicable connections
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What makes the brake pedal feel spongy? Why?
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Air getting compressed
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When a hydraulic power system is being bled, why is someone stationed at the reservoir?
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To ensure a continous fluid supply
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What is the best way to bleed a system when no component actuation is required?
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Low pressure
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When a hydraulic power system is being bled, how much pressure does the suction boost pump produce?
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100 PSI
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When should you do a complete power system bleed?
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Only when necessary
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Why do you disconnect the nose landing-gear forawar door during a landing gear system bleed?
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For better nose-gear bleed point access
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During a landing gear bleed, what is the first component you bleed?
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The manual gear box assembly
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Why do you need an external hydraulic test stand to complete the landing gear system bleed?
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Suction boost pump cannot actuate the gear
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What can cause air in a brake system?
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Low reservoir fluid
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Why do you actuate the pilot's brake pedals at least five times?
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To ensure hydraulic landing of the brake control valves
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What should you do before you apply hydraulic pressure during a flap system bleed?
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Ensure the flap selector agres with the actual position at the flaps.
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How do you reposition the emergency flap brake valve to NORMAL?
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Manually
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What would large particles of impurities in a hydraulic system indicate?
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Wearing of components
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How can you tell if a hydraulic system has been contaminated?
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By performing a test on a sample and looking at the color
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Why is it necessary to disconnect and sometimes remove some units from an aircraft to properly drain a system?
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They would prevent the fluid from being used
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What two items are stressed while flushing a hydraulic system?
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Cleanliness of fluid and elimination of air
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Prior to disassembling an accumulator, what precaution should you take?
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Ensure that air pressure is released
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Other than by visiual inspection, how else can defects in the accumulator be detected?
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NDI
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During accumulator reassembly, which direction is the piston installed in the accumulator?
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hollow end towards teh air side
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From the tests described in the text, how would internal leakage be detcted?
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Bubbles in hydraulic fluid
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Name three reasons for bench checking a reservoir.
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Troubleshooting, bench checking before or after a repair/overhaul
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What is the primary reason for bench checking a reservoir?
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To check after a repair/overhaul
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How can a flightline journeyman benefit from an in-shop journeyman's expertise when troubleshooting a reservoir?
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Backshop may have a better understanding of why a malfunction occured.
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How do reservoir overhaul TOs usually let you know what is required for the bench test setup?
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They depict the setup in an illustration and direct the journeyman to connect the reservoir IAW the illustration.
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What is the purpose of a text fixture?
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Holding the reservoir in place during a test.
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How can the test stand schematic help you when you're bench checking a reservoir?
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It's a graphic layout of all the test stands connetions.
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What is the purpose of the proof pressure test?
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Checking for faults under proof-pressure loads
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Why does an overhaul TO require you to pay special attention to what you're doing?
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They tell you what to do without telling you how.
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What are the danger of not properly attending to any "Unused" ports during the reservoir bench check?
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You could cause an explosion/implosion of the reservoir.
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What component is capable of directing hydraulic pressure from either system, and how is it actuated?
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Manually actuated hydraulic crossover valve
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Why are high-pressure O-rings and backup rings unnecessary in the lading gear sequence valves?
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Any internal leakage goes directly to the valve return side
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What is used in the main landing gear actuator to restrict the rate of extension and retraction as it approaches the uplock and downlock positions?
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Spring-loaded sliding valve snubbing assembly
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Specify how the MLG doors are prevented from closing while the gears are in transit.
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Lock actuator closes the door shutoff valve which reestrict the flow of fluid in the door closing return line
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How is the MLG sequence valve positioned during gear retraction?
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Mechanical linkages in the door
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Why does hydraulc pressure remain on the gear-retention and lock actuators after landing gear extension?
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To ensure the main and nose gears remain in the LOCKED position
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What is the first thing you should know prior to troubleshooting a malfunction?
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The full discrepancy
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If both MLG and NLG failed to retract, what would be the most probable cause of the malfucntion and why?
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The MLG selector valve
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The left MLG only partially retracted on takeoff. If the gear sequence valve is operating properly, what would be the most probable cause of the problem?
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Left MLG actuator is bad
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If the main gear retracted, but failed to lock in, what would be the most probable cause?
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A bad lock actuator
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What should you do with the parts you remove from a selector valve during disassembly?
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Place them in clean containers.
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How should the coils be checked for continuity?
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Using an Ohmmeter
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Why are matched parts sometimes marked with an X?
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To show position during installation
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What is the maximum degree the nosewheels can be turned?
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55
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What is the maximum degree you can turn if the aircraft's gross weight exceeds 180,000 bounds?
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45
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What component is installed in the steering metering valve to help prevent cavitation under externally applied turning forces?
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Spring loaded bypass check valve in the compensator
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How is the shimmy dampening accomplished within the compensator when the steering metering valve is in the neutral positioned?
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By restricting internal return passages in the valve
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If you receive a write-up that the aircraft has no steering action, what possible hydraulic malfunctions might you encounter?
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Little or no available pressure for steering
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If the steering became sluggish, what item within the metering valve might you suspect of causing the problem?
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Metering valve filter is clogged
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How would a main-gear wheel brake dragging affect nosewheel steering?
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It would cause the aircraft to pull to one side.
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Prior to troubleshooting a steering system, what should you do?
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Carefully inspect for leakage, security, damage, and cleanliness.
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In the event that both aircraft hydraulic systems fail, how many applications of the pilot's brake system are available from the reserve brake accumulator?
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Three
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The reserve brake accumulator is also a source of pressure for what other component?
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Parking brakes
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If a wheel skid is experienced while the pilot's brakes are applied to which brakes will the brake pressuree be reduced?
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The brake that skidding and its tandem.
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Where are the wheel speed transducers located?
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On each MLG
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List four items tho check for when inspecting the brake discs.
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Thickness, warpage, wear, and cracks.
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What components of a brake assembly are mated parts and should never be interchanged?
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Grip and tube
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During testing, how much pressure is applied to the brake assembly when checking for minimum OFF clearance?
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75 PSI
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What primary flight control surface provides control of the aircraft in the ROLL axis?
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Aileron
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Which primary flight controls are located in the trailing edge and near the tips of the wings?
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Aileron
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What primary flight control surface provides control of the aircraft in the YAW axis?
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Rudder
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What is the primary purpose of the rudder trim actuator?
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Reloacate the neutral position of the rudders
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What primary flight control surface provides control of the aircraft in the PITCH axis?
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Elevators
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What are the three modes of operation for the horizontal stab system?
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Electrical, hydraulic, and autopilot What are the two puposes of wing flaps?
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What are the two purposes of wing flaps?
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Shorter landings and takeoff roll anad it allows it to takeoff with greater loads
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What are the most common types of secondary flight controls?
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Whing flaps and spoilers
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Where are the wing flaps located?
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Trailing edge of each wing
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What is the purpose of forcing engine exhaust under the wing, through the flap hinge, and down both sides of the flap?
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It enables the aircraft to reduce it's landing approach
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Why should you determine if there is a fault isolation chart for the problem you are troubleshooting?
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To help aid troubleshooting
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When troubleshooting a malfunction, what should you do if you find there is no FI?
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Use system knowledge and logical trouble shooting methods.
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