Hydraulics Flashcards
The Ram Air Turbine (RAT) deploys automatically in flight under which of the following conditions?
Loss of two electric motor-driven pumps (EMPs)
Loss of electrical power to the Captain’s flight instruments
Loss of any two hydraulic systems
All three hydraulic system pressures low
All three hydraulic system pressures low
Regarding the hydraulic systems,…
the airplane has three independent 5000 psi systems: left, right and center.
the hydraulic reservoirs are pressurized by the bleed air system.
the center hydraulic system has two air-driven hydraulic demand pumps for periods of high system demand.
if center hydraulic system pressure is sensed low, the reserve brakes are isolated from the center system.
the airplane has three independent 5000 psi systems: left, right and center.
The left and right hydraulic systems are virtually identical. The left hydraulic system powers…
flight controls, left thrust reverser, left wing spoiler.
flight controls, left thrust reverser, right and left wing spoilers.
flight controls, left thrust reverser, right wing spoiler.
flight controls, left thrust reverser, landing gear activation.
flight controls, left thrust reverser, right and left wing spoilers.
The center hydraulic system is pressurized by…
two electric motor–driven pumps (EMPs), C1 and C2.
two engine-driven pumps and two electrically driven demand pumps.
two electrically driven primary pumps and two air-driven demand pumps.
two air-driven primary pumps and two electrically driven demand pumps.
two electric motor–driven pumps (EMPs), C1 and C2.
The two center hydraulic electric motor-driven pumps (EMPs) alternate as primary pump and demand pump. The primary pump operates continuously after the second engine is started. The demand pump will operate for the first three minutes after the second engine is started, when system pressure is low and under three other conditions. Which of the following is NOT a condition during which the center demand pump operates?
From beginning of takeoff roll until the gear is up and the gear doors are closed
Flaps or slats are in motion
From takeoff thrust set until radio altitude exceeds 2000 feet
During descent when the gear lever is down and radio altitude less than 2000 feet until groundspeed less than 60 knots
From beginning of takeoff roll until the gear is up and the gear doors are closed
In addition to flight controls, the center hydraulic systems powers…
landing gear actuation and nose gear steering.
leading edge slats and trailing edge flaps.
right and left wing spoilers.
All of the above are correct.
All of the above are correct.
The left and right hydraulic system electric motor-driven pumps (EMPs) provide supplementary hydraulic power for periods of high system demand as well as a backup hydraulic power source for the engine-driven primary pumps. In the AUTO position, the demand pumps operate when system low pressure is detected and for the first three minutes after the second engine is started on the ground, under what additional conditions will the EMPs operate?
From takeoff thrust set to flaps retracted
During descent and landing from gear down or RA less than 1000 feet to groundspeed less than 40 knots
Thrust reverser operation
All of the above are correct.
All of the above are correct.
The Ram Air Turbine (RAT), when deployed provides hydraulic and electrical power throughout the flight envelope.
True
False
True
Hydraulic quantity is displayed on the status display as a percentage of the normal service level (1.00 is normal). In addition to quantity indications, LO (amber), OF (white) and RF (white) are displayed to indicate required servicing. OF and RF are inhibited in flight.
True
False
True
The left and right hydraulic demand pumps are…
Engine Driven Pumps (EDPs).
Air Driven Pumps (ADPs).
Electric Motor-driven Pumps (EMPs).
Power Transfer Units (PTUs).
Electric Motor-driven Pumps (EMPs).
The left and right hydraulic systems each have a demand pump that is an electric motor-driven pump (EMP). In the AUTO position, the L and R demand pumps will operate under which of the following conditions?
Flaps are in the Flaps 30 position
From takeoff thrust set to flaps retracted
Flaps not up
During a single engine go-around after the flaps have been retracted to the UP position
From takeoff thrust set to flaps retracted
The Ram Air Turbine (RAT), when deployed, provides 5000 psi hydraulic power to the primary flight controls connected to which hydraulic system?
Left
Center
Right
None of the above. The RAT serves as an emergency source of electrical power only.
Center
The center hydraulic system is pressurized by…
one electric motor-driven pump (EMP) as a primary pump and an air-driven pump (ADP) that serves as a demand pump.
two air driven pumps (ADPs).
one electric motor-driven pump (EMP).
two electric motor-driven pumps (EMPs) that alternate as a primary and demand pump.
two electric motor-driven pumps (EMPs) that alternate as a primary and demand pump.
The center hydraulic system has isolation functionality in the event of a leak. Specifically, the isolation system uses three isolation valves and a reservoir standpipe to ensure the flight crew can…
lower the landing gear and that nose wheel steering is operational for landing, rollout and taxi.
lower the flaps and slats.
move the horizontal stab and elevator.
have anti-skid braking available for landing.
lower the landing gear and that nose wheel steering is operational for landing, rollout and taxi.
The Ram Air Turbine (RAT) deploys automatically in flight under which of the following conditions?
Loss of all four electric motor-driven pumps (EMPs) and an engine fails on takeoff or landing
Loss of all hydraulic pressure in the center and right hydraulic reservoirs
Loss of L1 and L2 buses
Engine failure during go-around
Loss of all four electric motor-driven pumps (EMPs) and an engine fails on takeoff or landing
