Air Management System Flashcards
What does the Dump Button do
Provides rapid cabin depressurization, by opening the outflow valve and commanding the packs and recirculation fans to off.
What Systems provide air for the AMS
Engines and APU
The Engines or APU provide Air for what systems
- Engine Start
- Environmental
- Water pressurization.
- Cabin Pressurization
- Anti - Ice -> Engines Only
When will the system automatically just down bleed system,
- When leak, over pressure, of fault is detected.
The XBLD is commanded open when.
- One side has bleed air at the other side does not have any.
2.
When would eng 1 bleed valve be commanded closed?
- When XBLD valve fails open and the other bleed source is engine 2.
- You pull the fire handle
Single pack operating altitude
31,000
When does the Ram Air vent open up
- Both packs fail and below 25k
What is the purpose of APU Bleed air
- ECS on the ground.
- Pressurization and ECS up to 15K
- Engine Starting.
- Assist with Engine starts below 21k
How Many AMS are there? Can 1 control the entire system
2 and yes
What is normal PSI for the system
45psi
How many fire loops does the AMS have to detect a fire
2 Loops, both need to detect a fire, if one fails only one needs to detect a fire.
When do the Recirculation Fans turn off?
- Packs are off
- Press the button
- Smoke detected in the fwd cargo bay or recirculation Bay
- Dump button is pressed
What happens when the Dump Button is pressed
- Both Packs commanded off
2. Open OFV and raises the cabin altitude to 12,400 at 2000fpm
What is the bleed system priority
- Onside Engine
- Opposite Side Engine
- APU
When will the XBLD valve open Automatically
- Only one side bleed source is detected
- Engine start 2 in the air
- Engine 1 start in the air with no APU Available.
What will command the Packs off
- Engine Starts
- System Duct Leak
- No bleed air available from its side.
- TL Set to Max Takeoff
- Pressing the DUMP button
Selecting LFE on pressurization knob– what is that?
Allows you to set the Landing Field Elevation manually but still using Auto mode, Cyan color
What color is the LFE on EICAS
Green Auto input
Cyan Manual input
What engine do you start first on Air Start
Engine 2
The engines provide Bleed air from what stages
From 6th and 10th stage
When doing an external Air start what do you need to turn off and why?
The packs to prevent air contamination
How are the Cargo Bays ventilated
Fwd - Receives air from the cabin than dumped over board
Aft Cargo has no air
What happens at Cabin ALT 9,700
Cabin ALT HI WARNING Message
What happens at Cabin ALT 12,400
OFV closes
What happens at Cabin ALT 14,000 - 14,750
Oxygen masks auto drop
How many AMS controllers are there?
1 controller with 2 channels
What is external air used for?
Engine starting and Cabin cooling with packs off
What is APU Bleed air used for
- Engine Starting on the ground
- Engine starting in the air below 21k
- ECS on the ground
- Pressurization
- ECS below 15k in the air
Can engine bleed flow back into the APU
No A check valve protects the APU
What is normal pressure for any engine operation
45psi
Can a single bleed air power both packs?
Yes through the crossbreed valve
When are the Recirc Fans commanded off
- Pressing the Dump Button
- Smoke in the recirc bay
- Cockpit switch
Where does the CPC when landing field elevation?
From FMS or enter in Manually LFE button
What is ABORT MODE
Cabin is scheduled back to the takeoff altitude
- Airplane stops climbing and begins a decent
- airplane has not climbed above 5000 AFE
What color is the LFE on EICAS
Green - Auto - FMS
Cyan - Manual input ( M in front of LFE )
What happens if the DUMP button is pressed in Manual mode
Only the Packs and Rec Fan turn off, the out flow valve do not open
When does the safety valve open?
When cabin pressure exceeds 8.6 psi
At what pressure does the negative relief valve open
negative .5 psi
Can you carry Dry Ice and Animals in the forward Cargo?
No. Only one or the other.
In the event of a Fire in the Forward cargo what happens?
A shutoff valve closes to isolate it from the cabin. and the fan turns off.
While in Auto Mode, when does the XBLEED valve open?
- When Bleed air source is available from one side but not the other.
When does the XBLEED Valve close when in Auto?
Bleed Leak is dented or Pull the fire handle.
While in Auto mode when does the BLEED 1 or 2 close?
- Engine Fire
2. Bleed Duct leak
When does the APU BLEED valve close?
- APU or Left bleed duct leak
- Anti-Ice is on
- Left engine bleed is available.
