13 - Hydraulics Flashcards
The airplane has three independent hydraulic systems: left, right, and center. The hydraulic systems power: (10)
- flight controls • leading edge slats
- trailing edge flaps
- landing gear • wheel brakes • nose wheel steering
- autopilot servos • yaw dampers • tailskid
- thrust reversers (PW)
Left hydraulic system powers (6)
• flight controls
• right yaw damper
- Rudder ratio changer
- Elevator feel
- Stab trim
- L autopilot servos
Right hydraulic system powers (4)
• flight controls
• normal brakes
• pitch enhancement system
- R autopilot servos
Center system powers (11)
• flight controls • left yaw damper • flaps and slats • landing gear • nose wheel steering • alternate brakes • tailskid • hydraulic driven generator - C autopilot servos - stab trim - elevator feel
The Center Hydraulic system consists of a reservoir and, (4)
two electric motor–driven pumps
one air–driven demand pump
a ram air turbine (RAT) pump
What is the difference between the L/R reservoirs and the C reservoir?
The C reservoir maintains reserve hydraulic fluid for use by the brakes and steering in the event of a center system hydraulic leak
The center number one electric primary hydraulic pump is ______ , if system quantity is sensed low, to ______
automatically isolated
provide hydraulic pressure to the reserve brakes and steering system
A hydraulic driven generator is automatically powered by the center hydraulic system when _______
The ______ will then operate continuously to ensure sufficient hydraulic pressure to drive the generator
electrical power is lost from both main AC busses
center air demand pump
The RAT, provides ______ to ______
hydraulic power
center flight controls
The RAT provides adequate hydraulic power at speeds _____
The RAT deploys automatically when _____
The RAT is inhibited from auto deployment _____
above 130 knots
both engines fail
on the ground
The ram air turbine PRESS light illuminates _____
The SYS PRESS light remains illuminated if _____
once the RAT is producing pressure
the RAT is the only source of center system pressure
