Hydraulic Flashcards

1
Q

Pressure to Pitch and roll trim actuators in pilot assist

A

1000 psi

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2
Q

Pressure of system

A

3000 psi

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3
Q

LDI

A

leak detection/isolation system

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4
Q

No.1 Hydraulic powers?

A

First stage of the primary servos and first stage of the tail rotor servo

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5
Q

What drives No 1/2 pumps

A

accessory modules

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6
Q

Pump components

A
Pressure relief valve
Bleed valve
Pressure filter
Return filter
Automatic low level sensing
Both pressure and return filters have PDI
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7
Q

Filter with bypass

A

Return filter, Pressure filter has no bypass

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8
Q

Transfer module

A

Routes fluid
Automatically routes fluid from backup pump if pressure lost through transfer / shuttle valve
Shutoff valves for primary servos and tail rotor servo/pilot assist

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9
Q

No.2 Hyd pump powers what?

A

Second stage primary servos and pilot assist servo assembly

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10
Q

How to secure pitch and roll trim actuators

A

Pressing TRIM cube on AFCS

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11
Q

How to secure boost servos and SAS actuators

A

SAS/BOOST pushbutton

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12
Q

Electrical interlock between first and second stage of primary servos

A

Prevents securing hydraulic power to both, if malfuntioning stage it precludes inadvertent securing of the good stage

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13
Q

What powers Backup hyd pump

A

AC electrical motor

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14
Q

Backup hyd pump purpose prior to rotor engagement

A

Provides pressure to #1/2 hyd systems

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15
Q

Other functions of Backup hyd pump

A

Pressure to rescue hoist system

Recharges the APU accumulator

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16
Q

What is secured when Backup is supplying pressure to #2 tail rotor servo

A

Priority valve secures pressure to the rescue hoist

17
Q

Time to energize the Backup pump

A

4 seconds with APU, 0.5 seconds with either main generator

18
Q

Backup pump internal depressurizing valve

A

reduces the output pressure to aid startup of the electric motor

19
Q

WOW backup switch functions

A

OFF- off
ON- recirculates fluid to and from each transfer module, maintains pressure to apu accumulator and rescue hoist
AUTO- Automatically maintains pressure to #1/2 systems and second stage of tail rotor servo as detected by LDI

20
Q

Weight off wheels

A

OFF or AUTO - same as WOW auto and pressure to second stage tail rotor if tail servo switch placed to BKUP

21
Q

Run time if backup hyd pump switch is cycled

A

90 seconds, 180 seconds with winterization kit

22
Q

When will Backup pump automatically turn on

A
#1 HYD PUMP (Loss of pressure)
#2 HYD PUMP (Loss of pressure)
#1 RSVR LOW
#1 TAIL RTR SERVO (Loss of pressure)
23
Q

Utility module function

A
Acts as transfer module for Backup pump
Has velocity fuse to secure fluid flow to APU accumulator if flow rate is excessive
24
Q

Requirements for HYD leak test

A
WOW
AC power
Rotors engaged
All reservoirs full
Backup Hyd pump switch in AUTO
25
What could fail if ON when Backup pump is turned on
FLIR
26
Backup pump CB popped and you need to trun the backup pump on
Caution make sure the aircraft is configured so the backup pump will not come back on when CB is reset
27
Indications of HYD leak test
``` #1 / 2 RSVR LOW BACKUP RSVR LOW SAS BOOST SERVO OFF AFCS DEGRADED #1 / 2 TAIL RTR SERVO BACKUP PUMP ON MASTER CAUTION ```
28
Hydraulic fill system
Hand pump and manual selector valve used to fill and service reservoirs Also serves as rotor brake reservoir
29
Utility Hyd system
Independently operates the sonar reeling machine Right rear quarter of the main transmission Circulates at 1000 PSI when not on Increases to 3000 PSI when turned on
30
Three boost servos
Collective, Yaw, and Pitch
31
All boost servos and roll channel incorporate a SAS actuator which provides rate damping
Roll channel is not boosted, just SAS