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SYSTEMS > HYD System > Flashcards

HYD System Flashcards

1
Q

NATOPS Chap 2

Hydrualic System

What Components do the Hyd pumps provide Pressure to?

A

Flight controls, APU, Tail Rotor, Resucue Hoist.

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2
Q

NATOPS Chap 2

Hydrualic System

The Hydraulic System Components are?

A

Three identical and interchangeable Pumps, Two transfer mods, one util mod, three dual-stage primary servos, tail rotor servos, pilot-assist servos, apu accum, and rescue hoist.

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3
Q

NATOPS Chap 2

Hydrualic System

What are the only actuators that don’t operate at 3000psi?

A

Pitch and roll trim actuators

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4
Q

NATOPS Chap 2

Hydrualic System

Can the systems operate idependently of each other?

A

Yes they can, but they are also redundant and supported by the electric motor-driven backup pump

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5
Q

NATOPS Chap 2

Hydrualic System

What drives the #1 hyd pump?

A

The #1 access mod

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6
Q

NATOPS Chap 2

Hydrualic System

What is incorporated into the Hydraulic pump?

A

a Pressure relief valve, pressure filter, bleed valve, return filter, auto low-level sensing switch

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7
Q

NATOPS Chap 2

Hydrualic System

What triggers the RSV Low Caution?

A

The automatic low-level sensing switch (mounted on top of the pump)

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8
Q

NATOPS Chap 2

Hydrualic System

What does the Priority Valve do?

A

It will secure Pressure to the Rescue hoist if the Backup pump is supplying pressure to the tail rotor servo

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9
Q

NATOPS Chap 2

Hydrualic System

How long does it take to for the B/U pump to energize?

A

4sec on APU/ext pwr or 0.5sec with either main gen on.

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10
Q

NATOPS Chap 2

Hydrualic System

On/Auto/off fx of B/U pump (WOW activated)

A

OFF- B/U pump remains off
Auto- B/U auto maintains px for #1/2 Hyd Pump and #2 TR servo
On- B/U pump recirculates hyd fluid to and from each xsfr mod and maintains Px in APU accum and rescue hoist as rq’d

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11
Q

NATOPS Chap 2

Hydrualic System

What causes the Backup Pump to automatically turn on?

A 
#1 HYD Pump Caution
#2 HYD PUMP Caution
#1 RES LOW Caution
#1 TR Caution
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12
Q

NATOPS Chap 2

Hydrualic System

What Criteria must be met to run Hyd Leak Test? (ABWAR)

A

1) AC power
2) B/U Pump in AUTO position
3) WOW
4) All Hyd Resv Full
5) Rotors Engaged

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13
Q

NATOPS Chap 2

Hydrualic System

Collective to yaw

A

Name: Collective to Yaw

Cause: Main Rotor Torque

Compensation Requirement: Nose yaws right when collective is increased

Compensation: Tail rotor thrust is increased

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14
Q

NATOPS Chap 2

Hydrualic System

Collect to Lateral

A

Name: Collective to Lateral

Cause: Lateral Lead (tail rotor propeller effect)

Compensation Requirement: Helo drifts right when collective is increased.

Compensation: Rotor disc is tilted left

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15
Q

NATOPS Chap 2

Hydrualic System

Collect to Long

A

Name: Collective to Longitudinal

Cause: Rotor downwash on stabilator

Compensation Requirement: Nose pitches up and helicopter drifts aft when collective is increased

Compensation: Rotor disc is tilted forward

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16
Q

NATOPS Chap 2

Hydrualic System

Yaw to Long

A

Name: Yaw to Longitudinal

Cause: Tail Rotor lift vector

Compensation Requirement: Nose pitches down and helicopter drifts forward when left pedal is applied.

Compensation: Rotor disc is tiled aft

17
Q

NATOPS Chap 2

Hydrualic System

Collect/airspeed to yaw

A

Name: Collective/Airspeed to Yaw

Cause: Camber of tail rotor pylon varies side load with airspeed

Compensation Requirement: Nose yaws left as airspeed increases

Compensation: A portion of the main rotor torque compensation is provided by a trim input that is proportional to collective position and airspeed. The trim input is then progressively washed out as pylon side loads increase with airspeed.

18
Q

NATOPS Chap 2

Hydrualic System

What is the job of the Transfer Module?

A

It automatically routes hydraulic fluid from the backup pump if No. 1/2 Hydraulic system pressure is lost.

19
Q

NATOPS Chap 2

Hydrualic System

What are the components in the #1 Transfer Module

A

It consists of:
a transfer/shuttle valve,
pressure switch,
first-stage primary servo shutoff valve,
and first-stage tail rotor servo shutoff valve.

*The #2 is the identical except it incorportates the second stage Primary servos

20
Q

NATOPS Chap 2

Hydrualic System

What happens if No. 1 Hydraulic pressure is lost?

A

The transfer/shuttle valve routes backup pump hydraulic fluid to the first stage of the primary servos and the first stage of the tail rotor servo. The pressure switch illuminates the #1 HYD PUMP caution and sends a signal to the LDI when No. 1 hydraulic pump pressure drops below prescribed limits.

21
Q

NATOPS Chap 2

Hydrualic System

What causes the PRI SERVO PRESS caution?

A

When at least one of the three pressure switches on the first or second stage of the primary servos sense low hydraulic pressure, a circuit is completed that actuates the #1/#2 PRI SERVO PRESS caution

22
Q

NATOPS Chap 2

Hydrualic System

What switches and valves are on the Transfer Module, and what are the associated cautions/advisories?

A

1) Pressure Switch- #1/#2 HYD PUMP
2) Transfer Valve- no associated caution/advisory

3) Shutoff Valves-
a) 1st stage Pri servo shutoff valve
b) 1st stage Tail Rotor shutoff valve
c) Pilot assist servo assembly shutoff valve
d) 2nd stage Pri servo shutoff valve

SYSTEMS (9 decks)

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