Hydraulics Flashcards

1
Q

How many hydraulic systems are on the airplane?

A

3 independent systems

HYD 1, 2 and 3

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2
Q

What systems use hydraulic power?

A
  • Flight Controls
  • Spoilers
  • Landing gear
  • nose wheel steering
  • wheel brakes
  • thrust reversers
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3
Q

Can hydraulic fluid be transferred between systems?

A

No

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4
Q

How many hydraulic pumps are on the airplane?

A

Six:

  • 2 EDPs (engine driven pumps)
  • 4 ACMP ( AC motor pumps)
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5
Q

What are the basic components of the hydraulic systems?

A
  • reservoir
  • pumps
  • accumulator
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6
Q

What do accumulators do?

A

Maintain constant pressure and prevent pump cavitation

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7
Q

When will ACMP 1 or 2 activate automatically on the ground?

A

When flaps are > 0 and:

  • TL set for takeoff, or
  • GS > 50 kts
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8
Q

When will ACMP 1 or 2 automatically activate when in the air?

A
  • engine failure or EDP failure

- flaps > 0

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9
Q

Name some important systems controlled by HYD 2

A
  • Landing gear
  • nose wheel steering
  • inboard brakes
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10
Q

What is the PTU?

A
  • power transfer unit

- mechanical pump that uses HYD 1 power to provide HYD 2 pressure

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11
Q

What is the primary purpose of the PTU?

A

To allow landing gear retraction in the event of an engine 2 or EDP 2 failure

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12
Q

When will the PTU automatically activate?

A

When engine 2 or EDP 2 fails and:

  • Flaps > 0 or landing gear not up and locked
  • EDP 1 not failed
  • HYD 2 reservoir quantity > 12%
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13
Q

With ACMP 1 and 2 in AUTO how is single engine taxi on engine 1 possible if nosewheel steering is on HYD 2?

A
  • releasing parking brake activates ACMP 2
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14
Q

What is the purpose of HYD 3?

A

Backup for the primary flight controls

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15
Q

What are HYD ACMP 3A and B pump switches ON and AUTO respectively?

A
  • HYD ACMP 3A is primary and has no automation

- HYD ACMP is the backup and automatically activates if ACMP 3A fails

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16
Q

What HYD ACMP will function if the RAT is the only power source?

A

HYD ACMP 3A

17
Q

In an electrical emergency what provides hydraulic pressure to flight controls until the RAT comes online?

A

HYD 3 accumulator

- after 8 seconds the RAT will power ACMP 3A

18
Q

In an electrical emergency can HYD 3 system power requirements overload the RAT?

A

No. HYD 3 system pressure is unloaded automatically to prevent a RAT stall