Hydraulics System Flashcards

1
Q

HYDRAULICS

What provides system A and B reservoir pressure

A

Bleed air

Sby system is connected to Sys B reservoir for pressure

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2
Q

HYDRAULICS

Minimum fuel for ground operation of electric motor-driven pumps

A

760kgs in the related main tank

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3
Q

HYDRAULICS

System A Leak in Electric Driven Pump - what does the fluid level reduce to

A

indicates 0%

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4
Q

HYDRAULICS

System A Leak in Engine Driven Pump - what does the fluid level reduce to

A

indicates approx 20% as fluid is provided by a standpipe

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5
Q

HYDRAULICS

System B Hydraulic Leak in Electric Pump

A

indicates 0% and system B pressure is lost. Fluid remaining in system B reservoir is sufficient for PTU operation

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6
Q

HYDRAULICS

System B Hydraulic Leak in Engine Pump

A

indicates 0% and system B pressure is lost. Fluid remaining in system B reservoir is sufficient for PTU operation

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7
Q

HYDRAULICS

Purpose of the PTU

A

Supplies the additional volume of hydraulic fluid needed to operate the autoslats and leading edge flaps and slats at the normal rate when system B engine-driven hydraulic pump volume is lost.

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8
Q

HYDRAULICS

PTU operates automatically when all of the following conditions exist:

A

System B engine-driven pump hydraulic pressure drops below limits

airborne

flaps are less than 15 but not up.

SFP/MAX
flaps not up

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9
Q

HYDRAULICS

Landing Gear Transfer Unit Purpose

A

provides volume of hydraulic fluid needed to raise landing gear at normal rate when Sys A engine-driven pump volume is lost.

Volume provided by the System B engine driven pump

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10
Q

HYDRAULICS

Landing Gear Transfer Unit operates when:

A

Airborne

No. 1 engine RPM drops below a limit value

landing gear leaver is positioned UP

either main landing gear is not up and locked

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11
Q

HYDRAULICS

Standby Hydraulic System powers:

A

uses a singel electric motor-driven pump to power:

thrust reversers
rudder
leading edge flaps and slats (extend only)
standby yaw damper

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12
Q

HYDRAULICS

Standby Hydraulic System Manual Operation Description positioning FLT CONTROL switch to STBY RUD:

A

Positioning either FLT CONTROL switch to STBY RUD:

  • activates sby pump
  • shuts off related hydraulic system pressure to ailerons, elevators and rudder by closing flight control shutoff valve
  • opens stby rudder shutoff valve
  • allows the sby rsystem to power rudder and thrust reversers
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13
Q

HYDRAULICS

Standby Hydraulic System
positioning ALTERNATE FLAPS switch to ARM

A
  • Activates sby pump
  • Closes trailing edge flap bypass valve
  • Arms ALTERNATE FLAPS position switch
  • Allows sby system to power leading edge flaps and slats and thrust reversers
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14
Q

HYDRAULICS

Standby Hydraulic System Automatic Operation
initiated:

A
  • loss of system A or B, and
  • flaps extended, and
  • airborne or wheel speed greater than 60kts, and
  • FLT CONTROL switch A or B hydraulic system ON

OR

main PCU force flight monitor (FFM) trips

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15
Q

HYDRAULICS

Standby Hydraulic System Automatic Operation does what:

A
  • activates sby pump
  • opens sby rudder shutoff valve
  • allows sby system to power the rudder and thrust reversers
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16
Q

HYDRAULICS

Standby Hydraulic System Leak in reservoir quantity decreases to

A

0%

17
Q

HYDRAULICS

Standby Hydraulic System leak in reservoir B system quantity decreases to

A

72%

18
Q

HYDRAULICS

Variations in hydraulic quantity indications occur when

A
  • system becomes pressurised after engine start
  • raising or lowering the landing gear or leading edge devices
  • cold soaking occurs during long periods of cruise

note: have little effect on systems operation.