Hydraulics Main Flashcards

1
Q

What do the main hyd pumps provide hyd pressure to

A

flight controls, apu, rescue hoist

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2
Q

what does the utility hyd pump provide hyd px to

A

dome

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3
Q

hyd system components

A

3 identical hyd pumps, 2 transfer modules, one utility module, 3 dual stage primary servos, 2 tail rotor servos, pilot assist servo assembly, apu accumulator, and the rescue hoist

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4
Q

general pressure of the hyd system

A

3000 psi

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5
Q

what component of hyd system is at a lower px

A

pitch and roll trim actuators in the pilot assist servo assembly which are at 1000 psi

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6
Q

what kind of distribution system

A

dual isolation distribution system

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7
Q

when will we get a hyd warning

A

when the hyd system is severely degraded as a result of several compound malfunctions in #1/#2 and back up sys

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8
Q

what does the #1 pump power

A

1 pri servo and 1st stage of tail rotor servo

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9
Q

what are the components of the #1 hyd sys

A

1 hyd pump, #1 xfer module, 1st stage pri servo, 1st stage tail rotor servo

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10
Q

parts of the #1 hyd pump

A

px relief valve, bleed valve, px filter, return filter, automatic low level sensing switch

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11
Q

how many PDIs per pump

A

2

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12
Q

Of the 2 filters in the hydraulic pumps, which is bypassable

A

the return filter, the pressure filter will not be bypassed and allow bad fluid in

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13
Q

what causes the #1 RSVR low caution

A

closing of the auto low level sensing switch

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14
Q

purpose of the #1 transfer module

A

passes fluid from the #1 pump to the first stage pri servo and 1st stage tail servo, and in the event of loss of pressure of the #1 pump routes fluid from the back up pump

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15
Q

1 transfer module components

A

transfer/shutoff valve, pressure switch, first stage pri shutoff valve, first stage tail rotor shut off valve

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16
Q

What causes the #1 hyd pump caution

A

activation of the pressure switch in the #1 xfer module which also signals the LDI

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17
Q

what does the #2 hyd system power

A

second stage primary servos, pilot assist servo assembly

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18
Q

2 hyd sys components

A

2 hyd pump and xfer module, second stage pri servos, pilot assist servos

19
Q

where is the #2 pri servo shutoff valve

A

2 xfer module

20
Q

can we directly actuate the pilot assist servo shut off valve?

A

Kind of, not fully secured with just one button

21
Q

what does pressing the sas/boost push button secure

A

hyd pressure to the boost servos and SAS actuators

22
Q

what causes a pri servo press caution

A

at least one of the 3 pressure switches on that stage sense low px

23
Q

what does the back up hyd sys do

A

powers #1 and #2 hyd sys before rotor spin up, powers rescue hoist system, and recharges the accumulator, and provides redundancy

24
Q

SAR concern if the b/u pump is supplying power to 2nd stage T/r

A

priority valve may secure hyd power to the rescue hoist

25
Q

back up hyd sys components

A

back up hyd pump and utility module

26
Q

caution about b/u hyd pump cb?

A

if the b/u hyd pump cb is out and a condition exists that would cause it to turn on upon being reset, you must either secure ac power or remove that condition before resetting or it may damage the current limiters and cause you to lose all loads and the #1 ac pri bus

27
Q

difference between b/u hyd pump and other pumps

A

powered by ac motor not engines/transmission

28
Q

b/u hyd pump contains what to ease start up for electric motor

A

internal depressurizing valve

29
Q

time frames associated with b/u pump energization

A

4 seconds on APU or ext power
.5 sec on main gen

30
Q

Weight on wheels B/U pump switch
off, on, auto

A

off - pump will stay off
on - if #1 and 2 are operating normal, it circulates fluid and maintains px in apu and rescue hoist
auto - holds px in #1/2 systems (including second stage tail servo) if LDI requires

31
Q

Weight off wheel B/U pump switch
off, on, auto

A

off/auto - auto maintains power in the #1/2 systems if required by LDI - will also hold px second stage if tail servo sw placed in backup
on - if other pumps operating normally, circulates flyid and maintains px in apu accum and rescue hoist

32
Q

how long minimum will the b/u pump operate if apu accum low

A

90 sec
180 if winterization kit is installed

33
Q

What will automatically turn on the b/u pump

A

1 HYD pump (aka loss of px)

#2 HYD pump (aka loss of px)
#1 RSVR low
#1 Tail RTR servo (aka loss of px)

34
Q

what does the utility module do

A

routes fluid to #1/2 xfer modules, second stage tail servo, rescue hoist and apu accum. it also contains a px switch that indicates when the pump is on

35
Q

what is the purpose of the priority valve between the utility module and rescue hoist

A

restricts hyd fluid to rescue hoist if px goes below a prescribed level

36
Q

what is the purpose of the velocity fuse in the utility module

A

secures fluid flow to the apu accumulator if flow rate goes past limit

37
Q

first reaction of LDI if #1 rsvr low

A

assumes leak is in 1st stage tail rotor servo lines and secures the 1st stage tail servo

38
Q

first reaction of LDI if #2 rsvr low

A

assumes leak is in pilot assist servo assembly and secures hyd pressure to the assembly

39
Q

if a leak progresses from rsvr low to hyd pump caution, what does LDI do

A

reopens the valve it shutoff and relies on pilot to secure the affected pri servo

40
Q

5 requirements for a hyd leak test

A

AC power
B/U hyd pump switch auto
All rsvr’s full
Weight on wheels
rotors engaged

it tests all hyd circuitry except for xfer shuttle valve operation

41
Q

10 lights indicating successful hyd leak test

A

1 rsvr low

#2 rsvr low
buck up rsvr low
Back up pump on
SAS
boost servo off
afcs degraded
#1 tail rtr servo
#2 tail rtr servo on
master caution

42
Q

what doubles as the rotor brake rsvr?

A

coffee can

43
Q

components of utility hyd sys

A

hyd pump, rsvr manifold, main xmsn oil cooler, distribution sys

44
Q

px of utility hyd sys when off/on

A

1000/3000psi