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Atlas - 409MC > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

When will the demand pumps operate if the hydraulic demand pump selector is in the AUTO position?

A
  • Demand pumps operate when related engine pump output pressure is low, or when respective fuel control switch is in CUTOFF
  • Demand pumps 1 & 4 also operate when flaps are in transit on ground , or flaps extended past 1 in flight
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2
Q

What does the hydraulic system (SYS FAULT) fault light indicate?

A
  • Low hydraulic system pressure
  • Low hydraulic reservoir quantity
  • Excessive hydraulic fluid temperature
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3
Q

What does a hydraulic demand pump low PRESS light indicate?

A
  • Demand pump selector positioned to OFF or AUX

* Demand pump commanded to operate and output pressure is low

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4
Q

What does a hydraulic reservoir quantity indication of .80 mean, as displayed on the Secondary EICAS display?

A

• 80% of normal service level

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5
Q

What does a magenta “RF” displayed next to a hydraulic quantity indicator on the Secondary EICAS mean?

A

• The reservoir requires refill

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6
Q

When is the engine driven hydraulic pump pressurized?

A
  • The engine is running

* The engine pump switch is ON

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7
Q

Which demand pumps are air driven, and which ones are electric motor driven?

A

No wing fence.

  • Systems 1 and 4 are air driven pumps, through the bleed air manifold.
  • Systems 2 and 3 are electric driven pumps.
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8
Q

What is the purpose of the auxiliary pump?

A

• Used for ground handling operations

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9
Q

Why are the hydraulic reservoirs pressurized by the bleed air system?

A
  • To prevent pump cavitation

* To ensure positive flow during high demand conditions

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10
Q

How does pulling a fire switch affect the hydraulic system?

A
  • Respective hydraulic fluid shutoff valve closes.
  • The EDP depressurizes.
  • The respective demand pump operates.
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11
Q

What will cause a Hydraulic System Fault to illuminate? (Two lows and a high)

A

Low hydraulic system pressure
Low hydraulic reservoir quantity
Excessive hydraulic fluid temperature

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12
Q

What will cause the #1 and #4 demand pumps to operate when in. the Auto position?

A

Engine Demand Pump output low or Fuel Control switch placed to CUTOFF.

Also Trailing Edge Flaps in transit past 1 on the ground, or Trailing Edge Flaps extended past 1 inflight.

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13
Q

What demand pumps are electric, and which are pneumatic?

A

no wing fence

Pumps #1 and #4 are pneumatic and #2 and #3 are electric.

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14
Q

What do I monitor when placing the #4 demand pump selector to AUX?

A

Verify SYS FAULT light extinguished

PRESS light remains illuminated

BRAKE SOURCE LIGHT extinguished

BRAKE ACCUMULATOR PRESSURE indicator in the
GREEN band.

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15
Q

With the loss of hydraulic system 4 how do I lower the landing gear and flaps?

A

The Landing gear will have to be lowered using the Alternate Gear Extension switch.

The flaps will revert to Secondary mode and extend more slowly.

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16
Q

What may cause the nose to pitch up on landing with the loss of hydraulic system 4?

A

Rapid extension of the Spoilers.

17
Q

What are some examples of major system components powered by each hydraulic system 1 and 4

A

• Systems 1 and 4 power the

steering
body gear
normal brakes (SYS 4), 
alternate brakes (SYS 1), 
trailing edge flaps

Systems 1 and 4 also provide redundant power to the primary flight controls.

18
Q

What are some examples of major system components powered by each hydraulic system 2 and 3

A

• Systems 2 and 3 power the

primary flight controls
stabilizer trim
elevator feel.

System 2 also powers the
alternate brakes
lower yaw damper.

System 3 powers the

upper yaw damper.

19
Q

What are some examples of major system components powered by each hydraulic system 1, 2 and 3

A

• Systems 1, 2, and 3 power

the respective center, right, and left autopilot servos (L,C,R are powered by systems 3,1,2 respectively)

20
Q

What are some examples of major system components powered by each hydraulic system 2, 3 and 4

A

• Systems 2, 3, and 4 power the spoilers.

21
Q

What are some examples of major system components powered by each hydraulic system

System 1 and 4?

Systems 2 and 3?

Systems 1, 2, and 3?

Systems 2, 3 and 4?

A
  • Systems 1 and 4 power the trailing edge flaps, body gear, normal brakes (SYS 4), alternate brakes (SYS 1), and steering. Systems 1 and 4 also provide redundant power to the primary flight controls.
  • Systems 2 and 3 power the primary flight controls, stabilizer trim, and elevator feel. System 2 also powers the alternate brakes and lower yaw damper. System 3 powers the upper yaw damper.
  • Systems 1, 2, and 3 power the respective center, right, and left autopilot servos (L,C,R are powered by systems 3,1,2 respectively)
  • Systems 2, 3, and 4 power the spoilers.

Atlas - 409MC (40 decks)

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