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82 Cards in this Set
- Front
- Back
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What is one incident that could occur from overfilling the reservoir?
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The reservoir could rupture.
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After air bubbles are no longer evident, how much fluid should you continue to bleed approximately?
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One quart
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What is the main difference in bleeding a landing gear system as opposed to a hydraulic power system?
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You must actuate the landing gear system.
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When placing the aircraft on jacks, how high should the aircraft be raised?
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High enough to ensure that the jacks support the weight of the aircraft.
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Before you hook a test stand up to the aircraft, what should you do?
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Make sure the test stand has been properly bled of all air.
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What could cause air in the brake system?
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A low resevoir fluid level, external leaks, or removing or replacing a unit.
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Large particles of impurities in the hydraulic system are an indication of what?
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Components in the system are wearing.
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If a hydraulic system doesn't have a bleed valve, how would you go about taking a sample of fluid?
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By disconnecting a hydraulic line.
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If the fluid must be drained from a contaminated system, where should you start?
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The reservoir.
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What makes the brake pedal feel spongy?
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Air in the brake system is being 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 continuous 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 forward 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 that 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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Why do you actuate the pilot's brake pedals at least five times?
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To ensure hydraulic loading 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 agrees with the actual position of 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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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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Because some units cannot be drained properly
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Why is it necessary to bypass some valves when flushing 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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What should you always do prior to disassemble of an accumulator?
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Ensure that the air pressure has been released.
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What should you use to clean all parts?
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TO prescribed cleaning solvent
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What tests should you perform after bench checking an accumulator?
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Piston seizure test, proof pressure test, and internal and external leakage tests.
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What is the purpose of the piston seizure test?
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Ensuring the piston does not seize or bind during operation.
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What is the purpose of a proof pressure test?
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Ensuring that all lines and connections can withstand the proof pressure for five minutes.
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What is the purpose of the internal and external leakage tests?
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Ensuring that there is little to no leakage.
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What are reasons for reasons for bench checking a reservoir?
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Checking before a repair/overhaul, checking after a repair/overhaul, and troubleshooting.
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What are some tests you may perform after bench checking a reservoir?
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Proof pressure test, fluid quantity system test, and functional tests.
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Other than by visual inspections, 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 the air side.
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From the tests described in the text, how would internal leakage be detected?
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Bubbles in hydraulic fluid
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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 occurred
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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 tests.
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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 stand's connections.
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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 waht to do without telling you how.
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What are the dangers 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 all does the landing gear system include?
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A control and position-indicating system, the main gear, the main-gear brake system, the nose gear, a nose-gear steering system, and an emergency extension system.
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The first thing you should know when troubleshooting is
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the full discrepancy.
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What does on "X" marked on a part of a selector valve show?
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When marked on matched parts, it shows the proper position of installation.
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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 landing 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 unlock and downlock positions?
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Spring loaded sliding valve snubbing assembly
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Specify how the main landing gear doors are prevented from closing while the gears are in transit.
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Lock actuator closes the door shutoff valve which restricts the flow of fluid to the door closing return line.
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How is the main landing gear sequencing valve positioned during gear retraction?
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Mechanical linkages in the door
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Why does hydraulic 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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If both main and nose landing gears fail to retract, what could be the most probable cause?
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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 probably cause of the problem?
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Left MLG actuator
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If the main gear is retracted, but failed to lock in, what would be the most probably cause?
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The lock actuators
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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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What makes it possible to steer aircraft in confined areas?
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Nosewheel steering (NWS) and damping systems.
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NWS can be operated
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Mechanically or electrically
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NWS provides
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directional control of the aircraft on the ground.
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What's the purpose of the steering disconnect valve?
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Preventing the nosewheels from trying to steer when the gear is retracted.
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When is shimmy dampening effective?
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Whenever the valve plunger is in neutral.
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If the steering disconnect valve has malfunctioned,
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there will be little or no pressure available for steering.
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What is the maximum number of degrees that the nosewheels can be turned?
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55 degrees
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What is the maximum turning degrees you can use if the aircraft gross weight exceeds 180,000 pounds?
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45 degrees
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What component is installed in 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 shimmy dampening accomplished within the compensator when the steering metering valve is in the neutral position?
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By restricting internal return passages in the valve.
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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 has clogged
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How would a main gear wheel brake dragging affect the 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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What does an automatic brake actuator do?
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operates the pilot's system metering valve during gear retraction to stop wheel spinning.
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Where would pressure come from in the even that both of the aircraft's hydraulic systems failed, but the pilot applied the brakes?
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The reserve brake accumulator
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How many applications of the brakes are supplied bu the reserve brake accumulator?
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Three
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If a wheel skid is experienced while the pilot's brakes are applied, what system will reduce braking at the affected wheel?
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The antiskid system
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What are the three main types of brake systems?
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Independent, integral, and slave brake systems
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What determines the type of brake used?
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The size and weight of the aircraft.
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What can cause the aircraft to pull to one side when brakes are applied?
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Air in the brake system, a dragging brake or brake metering valve improperly rigged, or internal leakage in the antiskid valve, shuttle valve, or brake metering valve.
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In order for the antiskid system to operate,
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the antiskid switch must be in the ON position and the landing gear handle must be down.
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The reserve brake accumulator is also a source for what other component?
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Parking brakes
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Where are the wheel speed transducers located?
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On each MLG
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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 (Simulates return line back pressure)
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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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List four items to check for when inspecting the brake discs
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Thickness, warpage, wear, and cracks
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What could be the results if a brake is allowed to soak in cleaning solvent for a long period of time?
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The paint will lift and crack.
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