Air Management System

Question 1

Air Management System uses bleed air for?

Answer 1

ECS (heating and cooling )

Engine start

Pressurization

Eng and wing anti-ice

Water pressure

Hot air leak detection

Question 2

How many AMS controllers?

Answer 2

1 controller with 2 channels which control respective onside system

Question 3

If one channel of AMS controller fail, then?

Answer 3

Remaining channel can control entire AMS

Question 4

What provides air for AMS?

Answer 4

Engine bleeds

APU bleed

External pneumatic source

Question 5

Bleed air used for?

Answer 5

ECS - heating n cooling

Engine start

Eng n wing anti-icing

Water pressurization

Question 6

External pneumatic air used for?

Answer 6

ECS on ground

Engine start on ground

Question 7

External ground source panel located?

Answer 7

Lower fairing between wings

Question 8

Primary use for APU bleed air?

Answer 8

ECS on ground

Engine start on ground

Assist w engine start in air FL210 or below

Bleed source for pressurization, heating n cooling 15,000 or below

Question 9

Bleed air tapped from engines, where?

Answer 9

6th and 10th stage compressors (EBV , HSV respectively)

System alternates between valves to regulate an adequate and safe pressure

Question 10

Normal pressure for any engine operation?

Answer 10

45 psi

Question 11

Purpose of pre-cooler?

Answer 11

Cools the hot bleed air coming from engine to the AMS

Question 12

What cools the pre-cooler?

Answer 12

Ground N1 fan

Flight N1 fan or ram air

Question 13

Overheat Detection System - ODS monitors what?

Answer 13

Engine bleeds n packs

APU bleed

Plumbing for wing n engine anti-icing system

Question 14

Both loops have to function to detect overheat condition?

Answer 14

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

Question 15

How many ECS packs?

Answer 15

2 independent Packs

Each engine provides air to respective pack

Question 16

Ratio of fresh air to recirculated air?

Answer 16

52% fresh to 48% recirculated air

Question 17

When are recirculation fans commanded off?

Answer 17

Cockpit switch

Smoke detected in recir bay

DUMP button pressed

Respective Pack is commanded Off

Question 18

Avionics E bay cooling?

Answer 18

Fwd and mid E-bay —- 3 fans pull air from cabin to bay

Aft E-bay —— natural airflow from cabin to bay

Question 19

When is emergency Ram Air ventilation activated?

Answer 19

Both Packs commanded OFF or failed below 25,000 msl (via L side Ram intake and electronically controlled)

Ram air pressure greater than cabin pressure (via R side Ram intake) at any altitude

Question 20

How many channels on Cabin Pressure Control CPC?

Answer 20

2 channels, one active n one standby mode

Question 21

What happens when DUMP button pressed?

Answer 21

Commands both packs Off

Opens OFV and raises cabin to 12,400 at rate 2,000 fpm

Shuts off both Recir. fans

Question 22

Bleed air priority in flight?

Answer 22

Onside engine

Opposite engine

APU if available

Question 23

What will close ECS packs?

Answer 23

Any engine start if APU is bleed source

Engine start on ground

Respective bleed system duct leak

Bleed air source not available for the pack

TL set to MAX on 🛫

REF A/I set to ALL on 🛫

REF ECS set to Off on MCDU (APU off)

Question 24

When r ECS packs recovered?

Answer 24

TL not at MAX and
- airplane is 500 AFE w both engines operating
- airplane is > 9,700 MSL w 1 engine operating

Question 25

If smoke detected in recirculation bay?

Answer 25

Both Recir fans deactivate

Cargo Recir fan deactivate

Cargo outflow valve closes