Study Guide Air Management System

Question 1

How many AMS controllers on plane?

Answer 1

One with two Channels.

Question 2

What provides air for the AMS?

Answer 2

Engine bleeds
APU bleeds
External pneumatic source

Question 3

What is external pneumatic source used for?

Answer 3

Engine start and environmental control

Question 4

Where is the external pneumatic ground source panel?

Answer 4

Lower fairing between the wings.

Question 5

What is the primary use for APU bleed air?

Answer 5

ECS on the ground.
Engine starting on the ground.
Engine start in flight up to FL210
Ecs up to 15,000

Question 6

Can engine bleed air flow back into APU?

Answer 6

No, q check valve prevents that from happening.

Question 7

What compressor stages are used for bleed air?

Answer 7

Sixth and tenth…. The system alternates between valves to regulate an adequate and safe pressure.

Question 8

Normal bleed pressure for any engine?

Answer 8

45

Question 9

Purpose of the precooler?

Answer 9

Cools bleed air coming from the engine to the AMS.

Question 10

What cools the precooler?

Answer 10

On the ground, N1 fan.

In flight the N1 fan or ram air?

Question 11

What does the overheat detection system (ODS) observe?

Answer 11

Engine bleeds and packs.
APU bleed.
Plumbing for eh engine and wing anti ice system.

Question 12

Do both loops of ODS have to function to detect a bleed system overheat?

Answer 12

Yes, but if one fails the other will work alone.

Question 13

Single pack limit?

Answer 13

FL310

Question 14

Can a single bleed source power both packs?

Answer 14

Yes, through the cross bleed valve.

Question 15

When are the recirculation fans commanded off?

Answer 15

Flight deck switch
Smoke det cited in recirculation bay.
DUMP valve pressed.
Respective pack is off.

Question 16

What keeps the three e bays cool?

Answer 16

Front and center… Three fans in each bay pull air from the cabin.
Aft… Natural air flow from cabin to the bay.

Question 17

When is the EMER ram air vent activated?

Answer 17

Below 25,000 and both packs failed or commanded off.

Ram air pressure is greater than cabin pressure on the right.

Question 18

Where does the CPC… Cabin pressure controller…. get landing field elevation?

Answer 18

Fms or manually selected.

Question 19

What happens when the dump button is pushed?

Answer 19

Commands both packs off

Opens the outflow valve open and raises the cabin to 12,400 at a rate of 2,000 feet per minute.

Question 20

Can the cabin altitude be raised above 12,400?

Answer 20

Yes, by using manual mode.

Cabin will also rise due to a natural leak.

Question 21

In manual mode will the cabin depressurize on landing?

Answer 21

No

Question 22

What is the bleed system priority?

Answer 22

Inside engine… Opposite side engine… APU if available.

Question 23

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

Answer 23

APU has priority if…. On the ground, wheel speed less that 50 knots and opposite engine bleed pressure is not enough for an engine start.

Question 24

When will the cross bleed valve automatically open?

Answer 24

If only one side bleed source is available.
Engine two start in flight.
Engine one start in flight if the APU is not available.

Question 25

What will close the ESS packs?

Answer 25

``` Any engine start if APU is the bleed source. Engine start on ground. Respective bleed duct system leak. Bleed air source not available. Thrust levers set to max on takeoff. REF A/I set to ALL on takeoff. REF ECS set to OFF in MCDU (APU is OFF) ```

Question 26

When are the ECS packs recovered?

Answer 26

TL not at max and 500 feet agl with both engines operating or if at 9,700 feet MSL with one engine operating.

Question 27

What happens if smoke is detected in the recirculation bay?

Answer 27

Both recirculation fans deactivate. Cargo recirculation fan deactivates Cargo outflow valve closes.

Question 28

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

Answer 28

FMS before takeoff or CPCS calculates using ambient pressure. LFE can be manually inputted.

Question 29

What color is the LFE on the EICAS?

Answer 29

Green if done by FMS | Cyan if manually done and will have an M in front of the number.

Question 30

What is the abort mode?

Answer 30

Cabin is scheduled back to takeoff altitude if the airplane stops claiming, begins a decent and the airplane has not climbed above 5,000 above field elevation or above 10,000 MSL.

Question 31

What does AMS use bleed air for?

Answer 31

``` ECS.. heating and cooling Engine start Pressurization Engine and wing anti ice Water pressure Hot air leak detection ```