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E jet > Air Management System (AMS) > Flashcards

Air Management System (AMS) Flashcards

1
Q

What does the AMS use bleed air for?

A
  • Environmental Control System (ECS) (heating and cooling)
  • Engine start
  • Pressurization
  • Engine wing and wing anti-ice
  • Water pressure
  • Hot air leak detection
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2
Q

How many AMS controllers are installed?

A

One controller with 2 channels which control the respective Onside system

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3
Q

What happens if a channel fails?

A

The remaining channel is able to control the entire AMS

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4
Q

What provides air for the AMS?

A
  • Engine Bleeds
  • APU Bleed
  • External Pneumatic source
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5
Q

What is bleed air used for?

A
  • ECS (heating and cooling)
  • Engine starting
  • Engine and Wing Anti-Icing
  • Water pressurization
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6
Q

What is external pneumatic air used for?

A
  • ECS on the ground

- Engine start on the ground

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7
Q

Where is the external ground source panel located?

A

Lower fairing between the wings

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8
Q

What is the primary use for the APU bleed air?

A
  • ECS on the ground
  • Engine starting on the ground
  • Assist with engine start (
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9
Q

Can engine bleed air flow back to the APU?

A

NO. A check valve prevents flow-back

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10
Q

Where is bleed air tapped from the engines?

A
  • 6th and 10th stage compressors (EBV and HSV respectively)

- System alternates between valves to regulate an adequate and safe pressure

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11
Q

What is normal pressure for any engine operation?

A

45 PSI

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12
Q

What is the purpose of the pre-cooler?

A

Cools the bleed air coming from the engine to the AMS?

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13
Q

What cools the pre-cooler?

A
  • Ground - N1 fan

- Flight - N1 fan or RAM air

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14
Q

What does the Overheat Detection System (ODS) observe?

A
  • Engine bleeds and packs
  • APU bleed
  • Plumbing for the wing and engine anti-icing system
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15
Q

Do both loops have to function in order to detect on overheat condition?

A

Yes, but if one fails the other will work alone to detect the overheat

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16
Q

How many ECS packs are on the airplane? What provides air for the packs?

A
  • 2 Independent packs (left/right)

- Each engine provides bleed air to its respective pack

17
Q

Can a single pack provide adequate temperature control and pressurization?

A

Yes, up to FL310

18
Q

Can a single bleed source power both packs?

A

Yes, through the cross-bleed valve

19
Q

What is the ratio of fresh air to recirculated air?

A

52% fresh air to 48% recirculated air

20
Q

When are the recirculation fans commended OFF?

A
  • Cockpit switch
  • Smoke detected in the Recirc Bay
  • DUMP button is pressed
  • Respective Pack is commanded OFF
21
Q

What keeps the 3 Avionic E-Bays cool?

A
  • FWD & CTR E-Bay - 3 fans each pull air from cabin to bay
  • AFT E-BAY - Natural air flow from cabin to bay
22
Q

When is the Emergency RAM Air Ventilation activated?

A
  • Both packs commanded or failed OFF below 25,000ft(via left side and electronically controlled)
  • Ram air pressure greater than cabin pressure(via right side)
23
Q

How many channels on the Cabin Pressure Control (CPC)

A

2 Channels, one active and one in standby mode

24
Q

Where does the CPC get Landing Field Elevation (LFE)?

A

FMS or can be manually selected

25
Q

What happens when the DUMP button is pressed?

A
  • Commands both ECS Packs OFF

- Opens OFV and raises the cabin to 12,400ft at a rate of 2,000ft fpm

26
Q

Can the cabin altitude be raised higher than 12,400ft?

A
  • Yes, by using the manual mode

- Cabin altitude will rise due to natural leak

27
Q

In Manual Mode, will the cabin depressurize on landing?

A

No

28
Q

What is the Bleed System priority?

A
  • Onside
  • Opposite side engine
  • APU (if avail)
29
Q

If engine and APU bleed air are available simultaneously, which has priority?

A
  • APU has priority if
  • Aircraft is on the ground
  • Wheel speed
30
Q

When will the crossbleed valve automatically open?

A
  • Only one side bleed source is available
  • Engine 2 start in the air
  • Engine 1 start in the air if APU is not available
31
Q

What are some things that will close the ECS packs?

A
  • Any engine start if the APU is the bleed source
  • Engine start on the ground
  • Respective bleed system duct leak
  • Bleed air source not available for the pack
  • TL set to MAX on takeoff
  • REF A/I set to ALL on takeoff
  • REF ECS set to OFF on MCDU (APU is OFF)
32
Q

When are ECS Packs recovered?

A
  • TL not at MAX, and
  • Airplane is 500’ AFE with both engines operating
  • Airplane is > 9,700’ MSL with one engine operating
33
Q

What happens if smoke is detected in the Recirculation Bay?

A
  • Both Recirc fans deactivate
  • Cargo Recirc fan deactivates
  • Cargo Outflow valve closes
34
Q

Where does the CPCS get cruise flight level & landing elevation from?

A
  • FMS before takeoff or CPCS calculates using ambient pressure
  • LFE may be manually inputted
35
Q

What color is the LFE on the EICAS?

A
  • Green - FMS input

- Cyan - Manual input (an ‘M’ will be in front of LFE)

36
Q

What is the ABORT mode?

A
  • Cabin is scheduled back to the takeoff altitude if
    • Airplane stops climbing and begins a descent, and
    • Airplane has not climbed > 5,000’ AFE or > 10,000’MSL

E jet (22 decks)

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