Air Management System (AMS) Flashcards by Adam Kwong

What does the AMS use bleed air for?

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

How well did you know this?

Not at all

Perfectly

How many AMS controllers are installed?

One controller with 2 channels which control the respective Onside system

How well did you know this?

Not at all

Perfectly

What happens if a channel fails?

The remaining channel is able to control the entire AMS

How well did you know this?

Not at all

Perfectly

What provides air for the AMS?

Engine Bleeds
APU Bleed
External Pneumatic source

How well did you know this?

Not at all

Perfectly

What is bleed air used for?

ECS (heating and cooling)
Engine starting
Engine and Wing Anti-Icing
Water pressurization

How well did you know this?

Not at all

Perfectly

What is external pneumatic air used for?

ECS on the ground

- Engine start on the ground

How well did you know this?

Not at all

Perfectly

Where is the external ground source panel located?

Lower fairing between the wings

How well did you know this?

Not at all

Perfectly

What is the primary use for the APU bleed air?

ECS on the ground
Engine starting on the ground
Assist with engine start (

How well did you know this?

Not at all

Perfectly

Can engine bleed air flow back to the APU?

NO. A check valve prevents flow-back

How well did you know this?

Not at all

Perfectly

Where is bleed air tapped from the engines?

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

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

How well did you know this?

Not at all

Perfectly

What is normal pressure for any engine operation?

45 PSI

How well did you know this?

Not at all

Perfectly

What is the purpose of the pre-cooler?

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

How well did you know this?

Not at all

Perfectly

What cools the pre-cooler?

Ground - N1 fan

- Flight - N1 fan or RAM air

How well did you know this?

Not at all

Perfectly

What does the Overheat Detection System (ODS) observe?

Engine bleeds and packs
APU bleed
Plumbing for the wing and engine anti-icing system

How well did you know this?

Not at all

Perfectly

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

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

How well did you know this?

Not at all

Perfectly

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

2 Independent packs (left/right)

- Each engine provides bleed air to its respective pack

Can a single pack provide adequate temperature control and pressurization?

Yes, up to FL310

Can a single bleed source power both packs?

Yes, through the cross-bleed valve

What is the ratio of fresh air to recirculated air?

52% fresh air to 48% recirculated air

When are the recirculation fans commended OFF?

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

What keeps the 3 Avionic E-Bays cool?

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

When is the Emergency RAM Air Ventilation activated?

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)

How many channels on the Cabin Pressure Control (CPC)

2 Channels, one active and one in standby mode

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

FMS or can be manually selected

What happens when the DUMP button is pressed?

- Commands both ECS Packs OFF | - Opens OFV and raises the cabin to 12,400ft at a rate of 2,000ft fpm

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

- Yes, by using the manual mode | - Cabin altitude will rise due to natural leak

In Manual Mode, will the cabin depressurize on landing?

What is the Bleed System priority?

- Onside - Opposite side engine - APU (if avail)

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

- APU has priority if - Aircraft is on the ground - Wheel speed

When will the crossbleed valve automatically open?

- Only one side bleed source is available - Engine 2 start in the air - Engine 1 start in the air if APU is not available

What are some things that will close the ECS packs?

- 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)

When are ECS Packs recovered?

- TL not at MAX, and - Airplane is 500' AFE with both engines operating - Airplane is > 9,700' MSL with one engine operating

What happens if smoke is detected in the Recirculation Bay?

- Both Recirc fans deactivate - Cargo Recirc fan deactivates - Cargo Outflow valve closes

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

- FMS before takeoff or CPCS calculates using ambient pressure - LFE may be manually inputted

What color is the LFE on the EICAS?

- Green - FMS input | - Cyan - Manual input (an 'M' will be in front of LFE)

What is the ABORT mode?

- 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