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AT 354 > Hydraulics and Fuel > Flashcards

Hydraulics and Fuel Flashcards

1
Q

BTFANGS

A

Brakes
Thrust Reversers
Flaps
Airbrakes
Nosewheel Steering
Gear
Stick Pusher

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2
Q

how is hydraulic power provided

A

variable volume, engine driven pumps
not “on demand”

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3
Q

if one hydraulic pump fails what systems fail

A

none - either pump can operate all systems

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4
Q

why is the hydraulic system pressurized

A

prevent foam and provide positive flow of fluid

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5
Q

what operates the on-off hydraulic valve

A

HP Cocks

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6
Q

HYD OVHT at what temperature

A

90C

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7
Q

where to check hydraulic fluid level

A

aft equipment bay

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8
Q

LO PRESS extinguishes at / starts at

A

1750 psi
1500 psi after 57 second delay

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9
Q

normal hydraulic system pressure

A

3000 psi

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10
Q

if there is no hydraulic pressure

A

pressure maintaining valve closes to try to provide 2300 psi for brake operation

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11
Q

auxiliary hydraulic system

A

6 pint tank
hand pump in flight deck

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12
Q

what does the auxiliary hydraulic system allow the hawker to do

A

lower landing gear
operate flaps
(enough to fully extend flaps and lower gear)

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13
Q

how many tank sections are there

A

6 per wing

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14
Q

boost pumps

A

if only one is operating it will only go to the side with the operating tank
takes 10 minutes with two pumps
18 minutes with one pump

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15
Q

XFEED

A

opposite tank feeding engine

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16
Q

TRANSFER

A

opens wing transfer valve and fuel will move to side with operating boost pump

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17
Q

what are boost pumps powered by

A

PS

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18
Q

what is the Emergency boost pump powered by

A

PE bus

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19
Q

FUEL LO PRESS

A

fuel line below 7 psi

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20
Q

Fuel Quantity

A

right MFD

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21
Q

fuel limitations

A

fuel cannot be in the ventral tank unless wings each have 3450 lbs
ventral must be full or empty
500 lbs max imbalance
ventral tank must be transferred when each wing reduces to 3300 lbs
ventral tank must be empty for landing

22
Q

what are the hydraulic pumps

A

1 engine driven
aux
hand pump

23
Q

hydraulic pressurization

A

over pressure 4000 psi
normal pressure 3000 psi
trapped if pumps fail 2300psi
low pressure out 1750
low pressure on. 1500 psi (for 57 seconds)

24
Q

hydraulic accumulators

A

main 1000 psi
brake 1000 psi
thrust reverser 1500psi

25
Q

ponds of fuel is equal to what percent @ 6.7 lbs

A

15

26
Q

fuel pumps

A

jet pumps (4)
boost pumps (2)
engine driven (2)

27
Q

fuel jet pump description

A

no moving parts
no electricity
vacuum system
use motive flow off boost pumps

28
Q

fuel boost pump description

A

can turn off / on
only controllable pumps

29
Q

cons of engine driven pumps

A

if it fails, we fail
provides pressure for fuel to get atomized

30
Q

where are the fuel annunciators

A

overhead panel above pump switches

31
Q

max fuel in order to transfer ventral fuel to wings

A

3300lbs

32
Q

minimum wing fuel with fuel in the ventral tank

A

3450lbs

33
Q

ventral tank quantity

A

1500 lb

34
Q

where is the fuel quantity read

A

right (copilot) mfd

35
Q

how long does fuel transfer take

A

10 minutes or 18 with single boost pump

36
Q

Boost pumps are located in the `

A

left and right wing tanks

37
Q

there are ____ water drains in the fuel system

A

five

38
Q

When the ventral tank contains fuel, a low Vmo speed warning will sound whenever aircraft speed exceeds

A

280 kts

39
Q

Total usable fuel capacity is

A

10,000lbs

40
Q

the maximum lateral imbalance permitted is

A

500lbs

41
Q

with both boost pumps inoperative:

A

ventral tank fuel cannot be transferred

42
Q

if the ventral tank is to be used in flight, it must be full, and each wing must contain

A

3450lbs fuel

43
Q

the aircraft fuel system accepts a maximum refueling supply pressure of

A

50psi

44
Q

when using the auxiliary system, landing gear should always occur before or after the operation of flaps

A

before

45
Q

pulling the AUX HYD SYSTEM lever

A

disengages balk arm, freeing hand pump for operation
closes on-off valve to block main system pressure and connect landing gear actuators to the reservoir return
landing gear handle no longer controls gear movement

46
Q

when can the hand pump action be stopped

A

once all three greens are on and positive resistance is felt to ensure landing gear is down and locked

47
Q

if one engine driven pump fails ( in relation to what the pressure indicator will show)

A

the hydraulic pressure indicator will display 3000psi and the applicable low pressure annunciator will illuminate

48
Q

if both engine driven pumps fail

A

indicated pressure is 2300 and both low pressure annunciators are illuminated

49
Q

the main hydraulic reservoir is pressurized to prevent

A

loss of wheel brakes

50
Q

the first step in operating the auxiliary hydraulic system is to

A

pull the AUX HYD SYSTEM lever

51
Q

the purpose of the pressure-maintaining valve in the main hydraulic system is

A

to maintain 2300 psi in the main accumulator for normal brake operation

52
Q

if one engine driven pump fails:

A

the remaining pump is capable of actuating all subsystems

AT 354 (12 decks)

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