Hydraulic System Flashcards
Each Hydraulic System provides ____ psi hydraulic pressure
3000
The engine driven hydraulic pumps are on the ____ which is ran by the ____
ADG (Accessory drive gear box) ; (PTO) power takeoff shaft
if system A and B fail, the ____ driven pump provides hydraulic pressure to system ____
EPU ; System A
EPU system activates automatically if both system pressures fall below _______ psi
1000 psi
what are the 4 types of hydraulic system accumulators
Reservoir pressurization acc.
FLCS acc.
Brake/JFS acc.
LG/hook acc.
both systems operate
LEFs (leading edge flaps) and Primary Flight controls
each system has _____ accumulator which are separated by _______ ______
FLCS ; check valves
_________ adds more pressure when rapid flight control movements take place, before the EPU receives a start command and activates which takes about ___ seconds
FLCS accumulators ; 2 second
Brake/JFS accumulators provide ______ for the JFS, and _______ for the brakes
starting power ; emergency pressure
if engine is at least ____%, it will take ___-___ seconds for system B to recharge the brake/JFS accumulators
12% ; 40-60
the LG/Hook pneumatic accumulator provides ___________ and _________. This accumulator ____ rechargeable during flight.
alternate landing gear extension and holds the hook firmly on the runway
Not rechargeable during flight
Hydraulic cooling is provided by ______ which also cools _______ and_______ oil
a hydraulic fluid fueled heat exchange ; constant speed drive and ADG
Normal Hydraulic pressure is _____-____ psi
2850-3250
Hydraulic/Oil Pressure illuminates when ______ system drops below ____ psi
either ; 1000 psi
Landing gear system is normally operated by system __
B
the main landing gear retract ______ and extend by _____
hydraulically ; free fall assisted by air loads
Nose gear extends and retracts by _______ pressure with a ____ degrees twist and may not indicate down and locked until below ____ kts
hydraulic ; 90* ; 190
While on the ground, the LG Handle is locked down, after takeoff a signal from the ________ gear WOW switch activates a solenoid which unlocks the handle
left main
WOW switches are on the ______ gear and operate as a function of ________ or _______.
both MLG and NLG ; strut extension or compression
with system ___ hydraulic pressure available make sure the LG handle is down before using the ALT GEAR handle because the handle sends a signal to ____ and _____ to operate normally
system B ; brakes and Trailing Edge Flaps
LG and Hook emergency Pneumatic bottle is located in the ______ well
NLG
gear is up and locked when __________
all three lights are off and LG handle warning light is off
LG handle warning light illuminates red when:
LG/doors do not match LG handle position LG/doors are in transit LG not locked in commanded position Airspeed <190 kts altitude <10,000' MSL rate of descent >250 fpm
LG warning horn when:
Airspeed <190 kts
Altitude <10,000’ MSL
rate of descent >250 fpm
TO/LDG CONFIG warning light illuminates when:
airspeed <190 kts altitude <10,000' MSL rate of descent >250 fpm TEFs not full down LG not down and locked
hydraulic system A operates:
Speedbrakes
fuel flow poportioner
leading edge flaps (LEFs)
FLCS
hydraulic system B operates
LEFs FLCS gun system air refueling system landing gear system nosewheel steering system wheel brake system JFS system
NWS is _____ controlled and _____ operated using system ____ pressure
electrically controlled ; hydraulically operated using system B pressure
NWS is limited to ___ degrees
32
NWS is automatically disengaged when ______
NLG strut is extended
NWS not available after_____
alternate gear extension
NWS FAIL caution light
System B Failure
NWS FAIL light does not illuminate for _____ or ______
System B Failure
or Strut Extension
Brake hydraulic pressure is provided by system ___
B
Brake pedals receive ____ power from the _____, and ___ power from the brake channel selection and has two batteries to provide DC power for redundancy and has ____ pistons - *Need full AC and DC power for full braking power
AC power ; 4 FLCS inverters ; DC power ; 3 pistons
if _____ power is lost, no braking is available
battery
channel 1 braking system:
normal position
brakes with LG handle down only
provides ant-spin when LG retracted
channel 2 braking system:
brakes with LG handle up or down
LG handle stuck up (alternate gear extension) - channel 2 must be selected
deceleration skid control is active with _____% pressure and _____ braking action
<85% and good braking action
Max performance skid control is active with ____% pressure and ____ braking action
85% or more and poor braking action
full anti skid protection above __ kts when accelerating and to __ kts when decelerating
above 12 kts ; 5 kts when decelerating
not antiskid available with ANTI-SKID switch ___ and brakes in CH. __
OFF ; ch. 2
Parking brake works when:
throttle off to idle position and WOW
parking brake requires power from _____ and _____ or _____ accumulator
battery bus and system B or Brake/JFS accumulator
parking brake automatically released when:
advancing throttle >1” beyond idle
ANIT SKID caution light on when:
> 5 Kts with malfunction affecting braking
<5 Kts with malfunction not affecting braking
LG handle down and switch in OFF
max engagement speed for hook operation
150 kts
hook operation is ______ operated and pressure is supplied by the ______________
pneumatically ; LG/Hook emergency bottle
in two-seater when will hook be raised?
when both switches are in the up position
if the hook was down, and you move the switch to up…
allows hook to raise a little to taxi over cable, or be manually disengaged
HOOK caution light when:
anytime hook is not up and locked
For an approach-end arrestment, touch down at least ____ before cable and lower _____
500’ before and lower nose gear
for departure-end arrestment, get hook down _____ before cable and reduce speed as much as possible
1500’
to prevent hook bounce and possible missed engagement avoid ________
centerline lighting
hook engagement: speeds greater than 150kts and greater than ____ from centerline or with ____ in the air could result in structural damage
35’ from centerline, with nosewheel in the air
