Landing Gear Flashcards
Describe the OFF position of the landing gear
Landing gear hydraulic system is depressurized
How many degrees can the nose-wheel steering system turn the nose gear with the TILLER, and how many with the RUDDER PEDALS?
TILLER - 70°either direction
RUDDER - 7°
What does the BRAKE SOURCE amber light indicate when illuminated?
Active brake hydraulic sources (hydraulic systems 4, 1,2) have low pressure
How are the landing gear held in position after retraction?
Main gear held up by uplocks
Nose gear is mechanically locked in the up position
When does RTO apply maximum braking? (3)
-airplane on ground
-wheel speed above 85 knots
-thrust levers are closed
What is the purpose of the brake accumulator?
Provides for parking brake application
What does a white, crosshatched, expanded gear position indication mean?
related landing gear in transit
What conditions must be satisfied in order for the landing gear lever lock to release?
Main gear are tilted
Body gear centered
What hydraulic system pressurizes the brake accumulator
System 4
What value on the brake temperature monitoring systesm causes BRAKE TEMP EICAS to appear
5
How does landing gear extend with the alternate gear extension system
By pushing the alternate gear extend switches the gear up locks and door latches are electrically released and the gear free falls.
Gravity and air-loads extend gear, and springs pull the ` into locked position
Why is it necessary to pressurize hydraulic system 4 before other systems?
Precludes the transfer of hydraulic fluid from system 1 or 2 into system 4. When parking brake is set an then released, brake hydraulic return lines dump into system 4
What does an EICAS message LIMITER indicate?
-Brake torque limiter failure on more than one wheel per truck
-The parking brake lever is released and the parking brake valve is not fully open
-Brake system control unit power loss occurs
