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60 Cards in this Set
- Front
- Back
What is the wire screen called in a non-pressurized reservoir? |
Finger screen |
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What is the purpose of a standpipe in a reservoir? |
Reserve fluid for the emergency pump. |
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During one complete cycle of a single acting double displacement type hand pump, fluid is drawn in through the inlet (supply) line on |
one stroke and forced out on both strokes |
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Why don’t variable-volume pumps require a separate pressure-regulating device in the system? |
They have an integral flow control valve (compensator) |
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What principle does a filter assembly with a differential pressure indicator operate? |
Difference between pressure entering the element and pressure leaving the element. |
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Hydraulic manifolds are used in a hydraulic system to provide a location where |
common fluid lines can come together. |
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What should you do to ensure an automatic check valve is installed properly? |
Make sure that the arrow marked on the valve housing is pointing in the direction of free-flow. |
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On which line is a manually-operated check valve usually installed? |
pressure
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Which type of shutoff valve gives a positive indication of the position of the valve? |
motor-operated
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If a relief valve with a ball seat area of 1/6 sq. inch is to relieve 1800 pounds per square inch (psi), the spring force would be |
300 pounds
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A balanced outlet relief valve |
eliminates the effective area that back pressure can act upon |
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In the poppet-type solenoid-operated selector valve, the poppets are attached to the solenoids by a |
plunger
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The difference between a selector valve and a servo valve is that the |
servo valve will control fluid flow. |
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Within a tandem actuator that utilizes a power control cylinder, what component allows fluid to position the actuator cylinder? |
Slide control valve |
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How is the selector valve in a nonautomatic hydraulic actuating system controlled? |
Manually by the operator |
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In an electrical follow-up system, the follow-up action will catch up and neutralize the servo valve when the |
input and follow-up transducers send the same signal to the amplifier. |
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Which type of orifice allows normal speed of operation in one direction, but limits speed in the other? |
check valve
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Hydraulic flow regulators regulate fluid-flow |
in one direction only
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If fluid does not split evenly in the flow equalizer, a |
free floating piston shifts position. |
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What is the purpose of installing sequence valves in a hydraulic system? |
So one operation is performed before the rest of the system can operate. |
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In a typical electrically sequenced system, what unit is used to ensure proper sequencing? |
micro switch
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In an emergency, the engine-driven hydraulic pump shutoff valves may be operated by |
pulling the T-handle |
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When electrical power is lost in a hydraulic power system, what would be the position of the solenoid-operated shutoff valves? |
open
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When the pump low-pressure warning light illuminates while the engines are running and the pressure reading on the accumulator pressure gauge reads low, the first component that should be suspected of having a malfunction is the |
engine-driven pump
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If when the engines shutdown, one of the engine pumps low-pressure warning lights fails to illuminate, what would be the first thing you should check? |
Press-to-test feature of the warning light. |
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When filling a system reservoir, you must observe the fluid level, because overfilling may cause the reservoir to |
rupture
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When bleeding a power system, how much additional fluid should you bleed out after air bubbles are no longer evident? |
one quart
|
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What must you do anytime you install a jumper wire in any system? |
Place a write-up in the aircraft forms under a Red X. |
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When taking fluid samples on a hydraulic system, you should |
take the sample from the reservoir and various other locations in the system. |
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If a hydraulic system is found to be contaminated, where should you begin draining the affected system? |
Reservoir |
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When accomplishing a piston seizure test on a hydraulic accumulator, hydraulic pressure, measured in pounds per square inch gauge (psig), should not exceed |
50 psig
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Which test should you perform to determine if the accumulator piston seals are leaking or bypassing? |
An internal leakage test |
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When performing an internal leakage test, air bubbles coming out of the accumulator end cap indicates |
internal leaking of the accumulator piston. |
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The purpose of the fluid quantity system test is to test the |
indication system |
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During extension and retraction, what unit slows the landing gear as it approaches the DOWN AND LOCKED and the UP AND LOCKED positions? |
Spring-loaded sliding-valve snubbing assembly |
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Refer to Foldout 3 for the following question. During a landing gear operational check, the main and nose gear fail to retract. You’ve determined that hydraulic pressure is available to the selector valve. What valve in the landing gear system would be the probable cause? |
Selector |
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Refer to Foldout 4 for the following question. During an operational check of the landing gear system, the nose gear fails to extend, but the doors open. Further investigation reveals that the nose gear actuator has no pressure to it. What would be the probable cause? |
Nose-gear sequence valve. |
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What would you use to remove the sleeve from a selector valve body? |
Wooden dowel |
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While disassembling a selector valve, you notice an “X” marked on the sleeve of the shuttle and sleeve assembly. It is marked in this manner to indicate |
proper position of matched parts. |
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If the steering became sluggish, what item within the metering valve might you suspect of causing the problem? |
Metering valve filter has become clogged. |
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In the event a brake line ruptures and the hydraulic fuse sets, how much hydraulic fluid (in cubic inches) will be lost? |
40 (+10/–0). |
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After receiving a write-up for dragging brakes, you have checked the brake adjustment and found it to be correct. The next logical step in troubleshooting the problem is to check the |
return pressure |
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During a post flight debriefing, the pilot reports that the antiskid is completely inoperative. Upon inspection you find that the antiskid switch is ON, and all circuit breakers are engaged. What is the next component you would check? |
Antiskid control box |
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When disassembling a brake, you should not disassemble the grip and tube parts of the assembly because they are |
mated parts |
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In the aircraft’s roll axis, what system compensates for imbalance or external environmental conditions that affect stabilized flight? |
trim
|
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What flight control surface is used to augment the ailerons to achieve the roll rate commanded either by the pilot or autopilot? |
spoiler
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If during a preflight check the pilot noted that he had no roll input in the mechanical mode of operation, what is the first thing that the hydraulic technician should do? |
Look at the appropriate Fault Isolation (FI) manual. |
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What is the position of the boom hoist lever when the boom is being flown? |
Freewheel |
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In the air refueling (A/R) system, what connects the tandem surge boots to the fuel-tube weld assembly? |
Gland nuts |
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If the air refueling (A/R) READY indicator light fails to illuminate with the A/R master switch to ON, what faulty component is the most likely cause? |
Signal amplifier circuit breaker |
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What is a probable cause if the air refueling (A/R) signal system fails to advance to MADE condition upon contact with the receiving aircraft? |
Signal coil |
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During breakaway of the air-refueling nozzle, what valve prevents excessive pressure buildup in the toggle actuators? |
Relief |
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Energizing the air refueling (A/R) slipway door control valve to the open side will direct hydraulic pressure to the |
open and close side of the slipway door actuators. |
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What component aids in forcing the cargo door down? |
Hydraulically actuated downlocks. |
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What component unlocks the ramp? |
Electro-mechanical actuators |
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Which panel allows you to manually operate the cargo door and ramp? |
Aft loadmaster’s control panel |
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The ramp raises, but fails to lock once the control switch is released, what would be the most probable cause? |
Latch actuators |
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At what minimum pounds per square inch (psi) pressure in the door close line, will the bomb door control valve ground check light illuminate? |
1500 (±50) |
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What hydraulic component in the bomb door system controls normal and emergency hydraulic pressure to the forward door hydraulic actuator? |
Dual shuttle valve |
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What would happen if you try to open the bomb doors with pressure in the door close line, as indicated by the illuminated ground check light? |
Damage to the aircraft could occur |