Air Management System (AMS) Flashcards
Where do the packs distribute air to?
Pack 1: Flight Deck / Cabin
Pack 2: Cabin
Air to cool the forward electronic bay is taken from:
The flight deck
There are two fans installed in the aft electronics bay. (T or F)
False
The gasper air distribution system provides air to:
Each Pilot and Passenger position
How many ECS (Environmental Control System) packs are on the aircraft?
Two (2) independent packs
How does the flight attendant know if the temperature setting knob allows him/her to adjust the temperature?
An ENABLED led on the Flight Attendant control panel turns on whenever the pilot selects the ATTND position in the cockpit
Which cargo bay(s) have ventilation fans?
Forward cargo bay
How many recirculation fans recirculate air back into the cabin and flight deck?
2
Can a single bleed source power both packs?
Yes, through the crossbleed valve
What cargo compartment(s) may we transport live animals and why?
Forward cargo bay because it has air recirculation
What does pushing out the RECIRC button do?
Turns off both recirculation fans
What cools the 3 E-BAYs?
Forward E-BAY : 3 fans that draw air from the flight deck
Center E-BAY: 3 fans that draw air from the rear cabin
Aft E-BAY: Natural air flow from the passenger cabin
What does the ATTND position do on the PAX CABIN knob?
It transfers cabin temperature control to the flight attendant control panel(s)
Engine and APU bleed air are the only air sources for the pneumatic system on the ground. (T or F)
False
With both overheat detection loops for engine bleed, air conditioning ducts, APU bleed air distribution, and anti-ice supply ducting operational, both loops must detect a leak before an EICAS message is displayed. (T or F)
True
What does the Overheat Detection System (ODS) monitor?
- APU bleed duct
- L/R engine bleed and air conditioning ducts
- L/R slat anti-ice ducts
- Trim pressure duct
How many bleed sources does each engine have?
2
What is the APU bleed air used for?
ON THE GROUND: Engine starting.
IN THE AIR: Engine starting ( < 21,000’) and Bleed source for pressurization, heating and cooling ( < 15,000’)
Where is the external ground air source panel located?
Lower fairing between the wings
Where is bleed air tapped from the engine?
6th and 10th stage compressors
What is external pneumatic air used for?
Engine starting and air conditioning
What provides air for the AMS (Air Management System)?
Engine bleeds, APU bleed and external pneumatic source.
What does the Pneumatic System provide air for?
- Engine start
- Environmental control
- Engine & Wing anti-ice
- Water pressurization
Can the APU bleed be used for the anti-ice system?
No
What happens when the XBLEED button on the panel is pushed out?
It manually closes the crossbleed
The DUMP switch is used for?
- Emergency evacuation
- Smoke evacuation
- Fast cabin depressurization
What happens when the DUMP button is pressed:
- Sets ECS Packs OFF.
- Sets recirculation fans OFF.
- Controls OFV for 2000 FPM cabin climb to 12,400’, then closes OFV.
The outflow valve can be modulated:
Automatically and manually
Is the pressurization system still in the AUTO mode when the LFE is entered manually?
Yes
The pressurization system consists of:
- Two Cabin pressure controllers (CPC)
- One Cabin Outflow Valve (OFV)
- One Negative Pressure Relief Valve (NPRV)
- One Positive Pressure Relief Valve (Safety valve)
- One Static Pressure Port
Cruise altitude automatically updates in the MCDU on PERF INIT page 3 if cruise altitude is changed in flight. (T or F)
False
Why does the DUMP button have a red raised border around it?
So it can be found in low visibility conditions in the cockpit.
Where does the CPCS (Cabin Pressure Control System) get Landing Field Elevation (LFE)?
FMS or LFE Selector knob on pressurization panel
Will the DUMP button work when the PRESSURIZATION MODE knob is in the manual mode?
No, HOWEVER both ECS packs and recirculation fans are turned off.
The MAN pressurization mode position allows manual control of?
The Outflow Valve (OFV)
What two ways can the outflow valve be modulated?
Automatically or manually
How can you determine the position of the outflow valve?
The outflow valve position indicator on the ECS synoptic page
In the MAN mode, will the cabin depressurize on landing?
No
What are the DOWN/UP positions used for on the CABIN ALT selector knob?
Manually closes/opens the OFV to decrease/increase the cabin pressure altitude.
What is the LFE CTRL selector position on the pressurization MODE selector knob used for?
To manually input of the landing field elevation.
How would you manually control the LFE?
By momentarily selecting DOWN / UP to decrease / increase the LFE in 100’ increments.
What color is the LFE on the EICAS?
- GREEN: FMS input.
2. CYAN: manual input; prefixed with a cyan “M”
Where does the CPCS (Cabin Pressure Control System) get cruise flight level and landing elevation?
Automatic operation with FMS:
- CRZ: PERF INIT page 3/3
- LFE: FMS database.
Automatic operation without FMS:
- CRZ: Ambient pressure
- LFE: Manually selected
The maximum altitude for single pack operation is? [SOP Limitation]
31,000’
