Air Management System

Question 1

(B) What does the AMS use bleed air for?

Answer 1

1. Environmental Control System (H/C)
2. Engine Start
3. Pressurization
4. Engine and wing anti-ice
5. Hot air leak detection

Question 2

(B) How many AMS controllers are installed?

Answer 2

One controller with 2 channels which control the respective onside system

Question 3

(B) What happens if a channel fails?

Answer 3

The remaining channel is able to control the entire system

Question 4

(B) What provides air for the AMS?

Answer 4

1. Engine bleeds
2. APU bleeds
3. External pneumatic source

Question 5

(B) What is bleed air used for?

Answer 5

1. ECS for heating and cooling
2. Engine start
3. Engine and wing-anti ice
4. Water pressurization

Question 6

(B) What is external pneumatic air used for?

Answer 6

ECS on the ground

Engine start on the ground

Question 7

(B) Where is the external ground source panel located?

Answer 7

Lower fairing in between the wings

Question 8

(B) What is the primary use for APU bleed air?

Answer 8

1. ECS on the Ground
2. Engine starting on the ground
3. Electrical source up to FL330
4. Assist in engine start up to FL210
5. Bleed source for pressurization, heating and cooling up to 15,000ft. MSL

Question 9

(B) Can engine bleed air flow back to the APU

Answer 9

No. There is an associated check valve which does not allow air to flow into APU

Question 10

(B) Where is the bleed air tapped from the engines?

Answer 10

6th and 10th stage of the compressor (EBV and HSV respectively)
System alternates between valves to regulate an adequate and safe pressure

Question 11

(B) What is the normal pressure for any engine operation?

Answer 11

45 PSI

Question 12

(B) What is the purpose of the pre-cooler?

Answer 12

Cools the bleed air coming from the engine to the AMS

Question 13

(B) What cools the pre-cooler?

Answer 13

1. Ground N1 Fan

2. Flight N1 Fan or ram air

Question 14

(B) What does the overheat detection system (ODS) observe?

Answer 14

1. Engine bleeds and packs
2. APU bleed
3. Plumbing for the wing and engine anti-icing system

Question 15

(B) Do both loops have to function in order to detect on overheat conditions?

Answer 15

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

Question 16

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

Answer 16

• 2 Independent packs
• Each engine provides bleed air to it’s respective pack
• APU on ground or up to 15,000ft. MSL

Question 17

(B) Can a single pack provide adequate temperature control and pressurization?

Answer 17

Yes, up to FL310

Question 18

(B) Can a single bleed source power both packs?

Answer 18

Yes, through the cross-bleed valve in the AUTO light off position

Question 19

(B) What is the ratio of fresh and recirculated air?

Answer 19

52% Fresh Air/48% Recirculated Air

Question 20

(B) When are the recirculation fans commanded off?

Answer 20

1. Cockpit switch pushed out and illuminated
2. Smoke detected in the recirculation bay
3. Dump Valve is pressed
4. Respective pack is commanded off

Question 21

(B) What keeps the 3 avionics E-Bay’s cool?

Answer 21

FWD and CTR E-Bay - 3 Fans each pull air from cabin to bay

AFT E-Bay - Natural air-flow from cabin to bay

Question 22

(B) When is the Emergency Ram Air Ventilation activated?

Answer 22

• Both packs commanded or failed OFF below 25,000 ft. (via left side and electronically controlled)
• Ram air pressure greater than the cabin pressure (via right side as a check valve)

Question 23

(B) How many channels on the Cabin Pressure Control (CPC) are there?

Answer 23

2 - Channels, one active and one standby mode

Question 24

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

Answer 24

FMS or can be manually selected

Question 25

(B) What happens when the dump button is pressed?

Answer 25

- Commands both ECS packs OFF - Turns OFF recirculation fans - Opens OFV and raises the cabin to 12,400 ft at a rate of 2,000 fpm

Question 26

(B) Can the cabin altitude be raised higher than 12,400 feet?

Answer 26

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

Question 27

(B) In manual mode will the cabin pressure depressurize on landing?

Answer 27

No

Question 28

(B) What is the bleed system priority in flight

Answer 28

- Onside Engine - Opposite Engine - APU (if available)

Question 29

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

Answer 29

APU has priority if: - Aircraft is on the ground (Unless > 50 knots and right engine is used only) - Wheel speed less than 50 knots - Opposite engine bleed pressure is not enough for engine start

Question 30

(B) When will the cross-bleed valve automatically open?

Answer 30

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

Question 31

(B) What are some things that will close the ECS Packs?

Answer 31

1. Any engine start if APU is the bleed source 2. Engine start on the ground 3. Respective bleed system duct leak 4. Bleed air source not available for the pack 5. TL set to MAX on takeoff 6. REF A/I set to ALL on takeoff 7. REF ECS set to OFF on MCDU (APU is OFF)

Question 32

(B) When are the ECS packs recovered?

Answer 32

TL not at MAX Airplane is 500ft. AFE with both engines operating Airplane is greater than 9,700 MSL with one engine operating

Question 33

(B) What happens if smoke is detected in the recirculation bay?

Answer 33

- Both recirculation fans deactivate - Cargo recirculation fans deactivate - Cargo outflow valve closes

Question 34

(B) Where does the CPCS get cruise flight level and landing elevation from?

Answer 34

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

Question 35

(B) What color is the LFE on the EICAS?

Answer 35

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

Question 36

(B) What is the ABORT mode?

Answer 36

- Cabin is scheduled back to the takeoff altitude if: - Airplane stops climbing and begins a descent - Airplane has not climbed greater than 5,000 AFE or 10,000 MSL