30 Questions
What is the purpose of the restrictors in the orifice check valves?
To slow down the extension of the gear
In aircraft with a non-mechanical back-up for gear unlatching, what power source is commonly used?
Pneumatic power
What type of valve is used in small aircraft for emergency gear extension?
Free-fall valve
Why does air movement past the gear help in its extension during emergency gear deployment?
To aid in pushing the gear into position
Why are large and high-performance aircraft equipped with redundant hydraulic systems?
To provide backup hydraulic power
What is used to release the uplocks and allow the gear to free fall if hydraulic power fails to extend the gear?
Unlatching device
What is adjusted to provide the correct amount of over-center travel of the side brace links?
Lock link end fitting
In what position should the landing gear be when adjusting the lock link end fitting?
Down position
What must the gear do when held inboard six inches from the down and locked position and then released?
Free fall into the locked down position
How is the down lock spring tension checked?
With a spring scale
What should be done to ensure proper adjustments for each aircraft?
Check manufacturer’s maintenance data
What is crucial to prevent collapse of the gear?
Adjusting the over-center position of side brace locking link
What happens when the gear cylinders are fully retracted?
They mechanically contact the sequence valve plungers
What role do sequence valves A and B play during retraction?
Act as check valves
How is the nose gear unlocked for lowering?
Pressurized hydraulic fluid flows from the hydraulic manifold to the nose gear uplock
What prevents fluid from reaching the down side of the main gear actuators when the doors are opening?
Sequence valves A and B
What happens when the main gear uplocks receive fluid pressure?
They unlock
Which components engage the plungers of sequence valves A and B to open them when the doors are fully open?
Door actuators
How can the roller be adjusted if it is not within tolerance?
By loosening the mounting bolts and raising or lowering the latch roller support
What is typically done at the hinge to adjust landing gear door clearances?
Adjusting door hinges
How is a main landing gear door latch mechanism adjusted on some installations?
By placing a serrated hinge with an elongated mounting hole in the proper position
What allows linear adjustments in certain installations for door hinges?
Using serrated washers
What does packing grease into a clean, dry bearing involve?
Pressing the bearing into the grease on the palm of the hand until it passes through rollers
What is used to hold the position of a serrated hinge during adjustment?
Serrated washers and torqued mounting bolts
How does the pilot extend and retract the landing gear in the simplest system?
By operating a lever mechanically linked to the gear
What is common in decreasing the required force for landing gear operation?
Use of roller chain, sprockets, and a hand crank
What type of landing gear system is typically found on light aircraft?
All-electric system
What is characteristic of an all-electric system in moving the landing gear?
Uses an electric motor and gear reduction
Which component is common in electric/hydraulic landing gear systems like those found in Cessna and Piper aircraft?
Reversible electric motor-driven hydraulic pump
What is a key feature of power packs used in electric/hydraulic gear retraction systems?
Contain a reversible electric motor-driven hydraulic pump
Test your knowledge on aircraft landing gear hydraulic systems by answering questions related to fluid flow, restrictors, emergency gear extension, and equipment components.
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