Q-HYDRAULICS Flashcards
(30 cards)
What services are provided from # 2 HYD system ? 12usq
HINT “LONERE
GONERE
LANDING GEAR OBD SPOILER EMERG BREAKE RUDDER (upper PCU) ELEVATOR (center PCU) NOSE STEERING
What services are operated from #1 HYD ? 8usq
HINT “FAIRE”
FAIREP
FLAP ANTI-SKID / Breaks INBD ROLL SPOILER RUDDER (lower PCU ) ELEVATOR LH/RH outboard PCU
What is the MIN HYD quantity for dispatch ?
HINT “%”
40 %
Where is the STDBY PUMP pressure indication ?
PRESSURE INDICATION ON PSA ( PERMANENT SYSTEM AREA )
Where are the PTU pressure indications displayed ?
On the switch itself
What is the # 3 HYD system for ?
For backup elevator trim
When is the # 3 HYD system used ?
Whenever one of the elevator PTU’s fail
What does the AUX hand operated pump operate ?
The emergency main gear landing gear extension.
How is the # 1-#2 pressurized ?
By the engine driven pump on the reduction gear box at a pressure of 3000 PSI
The standby hydraulic pump functions on what ?
HINT “ BUSSES”
Is powered by the right AC buss with back up from the left AC buss for back up to the #1 hydraulics if the engine fails.
provides 2900PSI
The PTU is a back up for what and is powered by what ?
Is back up for the #2 hydraulics and is powered by the #1 hydraulics.
must be on for takeoff and landing
for it to work you must have fluid in both systems
The #3 back up hydraulics poweres what ?
The left elevator ( inboard PTU )
The right elevator ( inboard PTU )
What does a green/white advisory light on the HYD system indicate In terms of the position of the valve.
Green - open
White - closed
What powers the firewall shut off valves ?
HINT “BUSS”
The battery bus
What is the HYD ISOL VLV caution light ?
HINT “LEAK/ISOLATE”
It means there’s a leak and the system is loosing HYD fluid so the valve closes and
In HYD ISOL VLV situations what is the # 1 system limited too ? (REF)
Rudder
Elevator
Flap
In HYD ISOL VLV situations what is the # 2 system limited too ? (RE)
Rudder
Elevator
Will the STDBY HYD PUMP green switch turn on when the pump turns on automatically ?
No
What is the priority valve ?
Is used if the pressure falls below 2100 psi in the #1 system so it closes the valve.
With the priority valve closed, what systems are cut off in the #1 system ?
HINT “FP”
Flaps and PTU
How does the # 3 HYD system work ? 2.6usq
HINT “MOTOR/SWITCHES”
Automatically by. DCMP 2 pressure switches.
One signals the pump to turn on if pressure drops to 2600 and stops at 3250
The other switch lights up the #3 STDBY HYD if the system falls below 900 psi ( in flight )
Where does the DCMP get it’s power from ?
HINT “ONE OF THE BATTERIES”
The standby battery
What is the accumulator isolation valve ?
Is a valve that isolates the elevators from the #3 HYD system pressure.
It’s energized closed. And opens when wither the #1-#2 HYD systems fail or the engines fail.
What causes an ELEVATOR PRESS caution light.
HINT “STUCK OPEN”
The isolation valve is stuck open supplying #1-2 HYD system even though they’re operative.
