Pneumatics Flashcards

1
Q

Name the aircraft functions that use pressurized bleed air:

A
  • Wing/cowl anti ice
  • Pressurization
  • Environmental/Air Conditioning
  • Engine starting
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2
Q

If the High pressure valve (HPV) is open, where will the system draw bleed air from?

A

10th stage

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3
Q

When the Bleed valve selector is set to AUTO on the ground, what will be the primary bleed source?

A

APU

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4
Q

When will bleed valve source switch from APU to engines on the ground when set to AUTO.

A

Anti ice is turned on, APU fail, APU shutdown

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5
Q

You takeoff with the APU on and anti ice off, when will bleed valves switch automatically from APU to engines?

A

Thrust less than TOGA, gear up and flaps are 20 or less.

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6
Q

On approach you turn on the APU, assuming you are not using anti ice, when will the bleed valve source switch from engines back to the APU?

A

Gear down OR flaps greater than 20 (Approach BIT)

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7
Q

What valves does ACSC 1 control? ACSC 2? (Air conditioning system controller)

A

ACSC 1: Left PRVSOV, APU LCV, Left HPV, Isolation valve

ACSC 2: Right PRSOV, right HPV

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8
Q

What would cause a L or R ENG BLEED caution message to appear?

A

ACSC Failure, PRSOV failure, HPV failure

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9
Q

PRSOV is also known as?

A

Engine Bleed Valve (EBV)

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10
Q

Name all of the things that would cause PRSOV to close?

A
  1. Fire Push
  2. Isolation due to duct leak
  3. ACSC Fail
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11
Q

What are the five isolation zones of the bleed air leak detection system?

A
  1. Wing anti ice
  2. Left cowl anti ice
  3. Right cowl anti ice
  4. Left bleed zone
  5. Right bleed zone
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12
Q

What is responsible for detecting leaks in wing bleed air? How about cowl leaks?

A

Wing = temperature sensors and loops

Cowl = Transducers

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13
Q

How will AILC (Anti ice leak controller) automatically respond to a bleed air leak?

A

Isolates the leak area

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14
Q

Which valves OPEN during engine start?

A

Starter valve, isolation valve, fuel SOV

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15
Q

Which valves automatically CLOSE during engine start?

A

Pack valves, PRSOVs, Starter valve

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