Air Management System Flashcards

1
Q

When will the bleed valve system automatically shut down?

A

When a leak, overpressure, or fail condition is identified

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2
Q

Can APU bleed air be used for the anti-ice system?

A

No

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3
Q

Is it possible to have the APU and engines supplying bleed air simultaneously?

A

No

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4
Q

Can a single engine bleed supply air to both ECS packs?

A

Yes, via the cross bleed valve

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5
Q

How does the negative and positive pressure relief valves work?

A

Spring loaded check valve that does not require electrical power

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6
Q

When will the negative pressure relief valve open?

A

When pressure exceeds -0.5 psi between the cabin and surrounding environment

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7
Q

When will the positive pressure relief valve open?

A

When pressure exceeds 8.6 psi between the cabin and surrounding environment

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8
Q

What is normal differential pressure below 37,000 ft?

A

7.8 psi

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9
Q

What is normal differential pressure above 37,000 ft?

A

8.34 psi

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10
Q

Is the dump function available in manual pressurization mode?

A

No

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11
Q

In manual pressurization mode is there automatic cabin depressurization on the ground?

A

No

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12
Q

What conditions must be met for the engine bleed valve to automatically open?

A
  • Bleed switch set to auto
  • Engine bleed is available
  • No fire is detected in the engine
  • No bleed duct leak is detected
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13
Q

Recirculation fans provide what percentage of fresh air to recirculated air?

A

52% fresh air to 48% recirculated air

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14
Q

When will the recirculation fans be commanded off?

A
  • Both packs are commanded off
  • Cargo bay fire signal activates
  • Dump button is pressed
  • Smoke detected in the recirculation bay
  • Cabin warmup mode
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15
Q

What provides air to the gasper ventilation system?

A

Air from the right recirculation fan

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16
Q

When will the emergency ram air ventilation valve open?

A
  • Both ECS packs are commanded off or failed

* Planes altitude is less than 25,000 ft

17
Q

What comprises the cabin pressurization control system?

A
  • Cabin pressure controller (CPC)
  • One cabin outflow valve (OFV)
  • One negative pressure relief valve (NPRV)
  • One positive pressure relief valve (safety valve)
  • Static pressure port
18
Q

What happens when the DUMP button is pushed?

A
  • CPCS sets the ECS packs and recirculation fans off

* Opens the outflow valve to maintain 2,000 ft/min climb to 12,400 ft

19
Q

What is the CPCS abort mode?

A

Cabin pressure is set back to the takeoff altitude

20
Q

When is the CPCS abort mode activated?

A
  • Airplane stops climbing
  • Cruise mode was not activated
  • Pressure altitude is lower than 10,000 ft
  • Airplane is lower than 5,000 ft above takeoff field elevation
21
Q

What color is the landing field elevation (LFE) on the EICAS?

A
  • Green FMS input

* Cyan manual input

22
Q

What happens if the cross bleed valve fails open?

A

Engine bleed #1 will be closed if the other bleed source is engine #2

23
Q

What prevents engine bleed air from flowing to the APU?

A

APU bleed check valve

24
Q

Where is bleed air extracted from the engine?

A

6th and 10th stages