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59 Cards in this Set
- Front
- Back
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Name the caution to do with moving flight controls |
Must have a safety man |
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Describe the 4 benefits of lockclad use on control cables? |
-Similar co-efficient of expansion to aircraft -requires less support hardware (less slack) -less friction - less maintenance |
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What is the purpose of the four way sensor in the control wheel hub? |
Gives commands to the pitch and roll channels for autopilot |
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Purpose of the phenolic friction plate at the base of the pilots control column |
Damper small movements of the aileron control linkage |
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What is different about the aileron booster package compared to rudder and elevator? |
The input quadrant is mounted remotely from the booster package |
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Purpose of slack absorbers? |
Prevent slack in an unloaded cable, when the other cable is subjected to unusually high tension. They also provide a means of adjusting cable tension |
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How does a slack absorber assy work? |
Spring tension for expanding and contracting and physical stops. |
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Purpose of the aileron pushrod assembly having a differential bell crank? |
The upwards angle/travel of the aileron is significantly more than the downwards travel |
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Minimum gap between top roller and aileron pushrod? |
0.010" |
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5 main components of the rudder? |
- rudder pedals - cable system - viscous dampers - booster attachment - booster input |
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Purpose of the two rudder viscous dampers? |
-Prevent oscillations or vibrations through the control surfaces. -Prevent surface flutter should the linkage from booster to the surface fail |
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What component increases the force required of the pilot to move the control column when the aircraft pulls an excess of 1g, in order to prevent excessive force loading? |
The control column augmenter weight. |
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3 functions of the elevator tension regulator?? |
- Tension regulator (expanding and contracting aircraft) - Slack take up (unloaded cables) - Cable tension indicator |
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Whats different about the elevator viscous dampers? |
They are double acting. Twice the damper actuation for the same surface movement |
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Purpose of the elevator spring cartridge? |
Gives the elevator down force resulting in more force required at the control column |
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What limits trim control travel (act as travel stops)? |
Swaged ball fittings on the control cables contact the the aircraft structure as travel limit stops |
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How do the aileron trim actuators give asymmetrical movement? |
Trim actuators are Identical and installed facing inboard |
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2 things elevator auto trim clutch arrangement does? |
- Free manual operation when auto trim is disengaged and/or for motor to wind down during disengagement - Allows for manual over ride by holding the flight deck trim wheel |
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Purpose of load sensors on elevator booster package? |
Create an electrical signal proportional to the hydraulic differential across the actuator piston, to move the trim tab until in desired postion |
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Purpose of the auto trim down spring? |
Allow for accurate feedback at higher speeds |
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Purpose of the force link tab? |
"Improve longitudinal stability and increase CoG loading range." Higher the aircraft speed the more the force link tab opposes nose up tendency |
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How does the force link tab position relate to the elevator/nose postion? |
Opposite Elevator/nose full up - force link tab full down Elevator/nose full down - force link tab full up |
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2 purposes of the teeter totter? |
- Act as a mass balance to avoid tab flutter - Contact the elevator skin to for a travel limit stop |
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Why is force link tab spring loaded? |
To allow force to be progressive with feedback. Smooth force reactions |
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What kind of flap does the p3 have? |
Fowler high lift wing flaps |
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Purpose of the flaps? |
Augment high lift at low speeds ie landing etc |
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3 things that would be required when interchanging flaps? |
- Extension marks are relocated - Asymmetry cable anchor is repositioned - Fuel deflector installed only on left hand flap |
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Purpose of the droop cam on flat track? |
To angle the flap to 40° in the last 23% of flap extension to provide aerodynamic braking |
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Is sequence of telescopic flap actuator relevant? (Does it matter) |
No, primary and secondary screwjack are the same length |
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What limits the flap range of movement? |
Drive system follow up (Even though there are stops located on screw jack ends) |
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Purpose of a torque tube? |
Transfers power from flap drive unit to flap actuators |
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What prevents torque tubes from moving/whipping when they rotate? |
Self aligned sealed ball bearing and housing assemblies |
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Name the 2 sections a flap drive unit consists of? |
-The main gearbox -control valve assembly |
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Purpose of the flap control valve? |
Directs pressure from the NO.1 & 2 hyd system to the respective flap motors |
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Purpose of flap control valve check valves? |
Allow the flaps to be operated by one or both hydraulic system. (Used as a bypass to stop hydraulic lock if one system fails) |
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What postion is your datum when rigging flaps? |
Flaps up position |
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Purpose of the flap asymmetry system? |
Prevent a mismatch of flap position that would put the flap into a roll. (ie if torque tube fails) |
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Components in the flap asymmetry system? |
- 2 asymmetry detectors - Shut off valve - 2 brake units - Signal light |
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What 3 things happen in the asymmetry protection system when the asymmetry Detectors trigger? |
- Flap shut off valve stopping flow of hyd fluid to motors - 2 Flap brake units locking torque tubes - FLAP ASYM light |
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What is the difference in flap position that will set off the asymmetry protection system? |
Less than 1 inch |
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How the asymmetry shut off valve works? |
Permits fluid from both no1 and no2 hyd systems. When solenoid energizes, it shuts off pressure to flap motors |
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What prevents the asymmetry shut off valve from reopening? |
Spring loaded overcentre cam |
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Purpose of the rudder booster shut off system? |
To reduce the pilots control over the rudder when flying at high speeds. Stops the pilot over stressing the tail by putting more feedback through the controls |
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3 times the RUDDER POWER light will illuminate |
- Both hydraulic system pressures reach the rudder booster when flaps LESS than 60% - Only one hydraulic system pressure reach the rudder booster when flaps MORE than 60% - NO HYD PRESSURE at ANY flap position |
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Purpose of booster package ASSY? |
To assist the pilot to over come "air loads" with hydraulic force |
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What hydraulic system does the autopilot use in regards to booster packages? |
Only no1 hydraulic system |
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4 prominent booster package features in rigging? |
- Mechanical neutral - Hydraulic neutral - Control travel limits - Graduated control response |
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4 mechanical components that make up booster packages? |
- Input system - Output system - Follow up link - Boost off mechanism |
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Where is the elevator booster hydraulic assembly mounted? |
On the actuator yoke |
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Purpose of the check valves in the elevator booster hyd ASSY? |
PREVENT CAVITATION when only using one hydraulic system, or when parked and wind moves the control surface |
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Maximum leakage for a booster actuator? |
12 drips per minute |
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Purpose of the booster control valve? |
Governs the hydraulic operation of the booster actuator |
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How does the booster hydraulic load sensor signal the autopilot system? |
Sends a signal by measuring the hydraulic load on the booster actuator (pressure differential across pistons) |
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2 purposes of the trim indicator? |
- To inform the amount of effort the autopilot has to exert the keep the aircraft on current attitude - Provide warning of aircraft attitude in autopilot disconnection |
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Purpose of the orifice valve in the elevator booster package? |
Metering/controlling the hydraulic advantage the pilot receives when boost is on, autopilot is off. Giving the same control sensitivity over the elevators as the ailerons and rudder. |
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3 components the autopilot engagement valve ports hyd pressure to? |
- Auto pilot transfer valve - Auto pilot engagement actuator - Orifice valve shutoff mechanism |
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Purpose of Auto pilot engagement mechanism? |
To give the autopilot authority over the booster control valve (Locks pilot input linkage so control valve only listens to autopilot) |
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3 ways the autopilot can be disengaged? |
- Selecting the off control switch - Disconnect buttons on either pilot control - Loss of number 1 hyd system pressure |
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What 4 things will pulling the boost off handle operate? |
- Control valve to neutral - Increase pilot mechanical advantage - Shuts of hyd pressure to control valve - Operate Dual shut off and bypass valve to provide run round circuit |
