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Flashcards in Air Management System (AMS) Deck (36):

What does the AMS use bleed air for?

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


How many AMS controllers are installed?

One controller with 2 channels which control the respective Onside system


What happens if a channel fails?

The remaining channel is able to control the entire AMS


What provides air for the AMS?

-Engine Bleeds
-APU Bleed
-External Pneumatic source


What is bleed air used for?

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


What is external pneumatic air used for?

-ECS on the ground
-Engine start on the ground


Where is the external ground source panel located?

Lower fairing between the wings


What is the primary use for the APU bleed air?

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


Can engine bleed air flow back to the APU?

NO. A check valve prevents flow-back


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


What is normal pressure for any engine operation?

45 PSI


What is the purpose of the pre-cooler?

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


What cools the pre-cooler?

-Ground - N1 fan
-Flight - N1 fan or RAM air


What does the Overheat Detection System (ODS) observe?

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


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 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?

-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