Hydraulics Flashcards
What does an Engine or Electric Hydraulic Pump PRESS light indicate?
Low pump pressure
What is powered by the Ram Air Turbine (RAT)?
Flight controls
What condition automatically deploys the Ram Air Turbine (RAT)?
Both engines fail
What is the minimum airspeed required to maintain adequate Ram Air Turbine (RAT)
hydraulic pressure?
130 knots
What cockpit indication assures adequate pressure to the center system when the
Ram Air Turbine (RAT) is deployed?
PRESS light
What does RF indicate on the Status page adjacent to hydraulic quantity?
Reservoir requires refilling
What does the SYS PRESS light indicate?
Low system pressure
Is it possible to deploy the Ram Air Turbine (RAT) on the ground with no power on
the aircraft?
Yes, RAT will deploy on the ground if RAT switch is
pushed regardless of Battery switch position
How does pulling the Engine Fire switch affect the hydraulic system?
Shuts off fluid to the engine pump and depressurizes the
pump
(757) What does the RSVR light indicate?
Low reservoir hydraulic quantity and/or pressure
(757) What does the OVHT light indicate?
Respective pump temperature is high
(757) What are the electrical inhibits associated with the hydraulic system?
With one engine‐driven generator operating and both
Center Electric Pump switches ON, the number two
electric pump is inhibited
(757) Which components are powered by the left hydraulic system?
Flight controls, alternate brakes, left thrust reverser,
main cargo door, flaps and slats, landing gear, and
nosewheel steering
(757) Which components are powered by the center hydraulic system?
Flight Controls
(757) Which components are powered by the right hydraulic system?
Flight controls, normal and reserve brakes, and right
thrust reverser
(757) What system uses the left reservoir reserve hydraulic fluid?
Power Transfer Unit (PTU)
(757) What condition(s) cause the Power Transfer Unit (PTU) to operate
automatically?
Left engine failure and/or left engine‐driven hydraulic
pump pressure low
(757) Which components are powered by the Power Transfer Unit (PTU)?
Landing gear, nosewheel steering, flaps and slats, and
main cargo door
(757) What system uses the center reservoir reserve hydraulic fluid?
Ram Air Turbine (RAT)
(757) What system uses the right reservoir reserve hydraulic fluid?
Reserve brakes
(767) What does a QTY light indicate?
Low reservoir quantity
(767) Which components are powered by the left hydraulic system?
Flight controls
(767) What reservoir maintains reserve hydraulic fluid for use by reserve brakes and
steering?
Center hydraulic system
(767) Which system(s) use reserve hydraulic fluid?
Reserve brakes and steering
(767) Which components does the center hydraulic system power?
Flight controls, alternate brakes, reserve brakes, tailskid,
landing gear, nosewheel steering, Hydraulic Driven
Generator (HDG), and flaps and slats
(767) Which components are powered by the right hydraulic system?
Flight controls and normal brakes and Pitch Enhancement System (PES)
(767) When does the left electric demand pump operate in AUTO?
Left engine pump pressure low
(767) When does the right electric demand pump operate in AUTO?
Right engine pump pressure low or flap lever in 1, 5, 15
or 20 to ensure pressure to normal brakes during takeoff
(767) When does the Air Demand Pump (ADP) operate automatically?
Low center hydraulic system pressure, heavy load items
are selected or when the Hydraulic Driven Generator
(HDG) is signaled to operate
(767) What is the power source for the Air Demand Pump (ADP)?
Bleed air from the center pneumatic duct
