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E Jet 175 Study Guide > ECS > Flashcards

Flashcards in ECS Deck (36):
1

How many AMS controllers are installed?

One controller with 2 channels which control the respective onside system

2

What happens if a channel fails?

The remaining channel is able to control the entire AMS

3

What provides air for the AMS?

Engine bleed

APU bleed

external pneumatic source

4

What does the AMS provide?

ECS (heating and cooling)
Engine start
Pressurization
Engine and wing anti- ice
Water pressure
Hot air leak detection

5

What does the AMS provide?

ECS (heating and cooling)
Engine start
Pressurization
Engine and wing anti-ice
Water pressure
Hot air leak detection

6

Can we use APU for wing anti- ice?

No

7

What is the abort mode?

Cabin is scheduled back to the takeoff altitude if

Airplane stops climbing and begins a descent, and

Airplane has not climbed > 5,000 AFE or > 10,000 MSL

8

What color is the LFE on the EICAS?

Green FMS input

Cyan. Manual input (an M will be in front of LFE)

9

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

FMS before takeoff or CPCS calculates using ambient pressure

LFE may be manually inputed

10

What happens if smoke is detected in the recirculation bay

Both recirculation fans deactivated

Cargo recirculation fan deactivated

Cargo outflow valve closes

11

When are ECS packs recovered?

TL not at max, and

Airplane is 500 feet AFE with both engines operating

Airplane is > 9500 MSL with one engine operating

12

What are some things that will close the ECS packs?

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

13

When will the crossbleed valve automatically open?

Only one side bleed source is available

Engine 2 start in the air

Engine 1 start in the air If APU Is Not Available

14

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

APU has priority if

Aircraft is on the ground

Wheelspeed

15

What is the bleed system priority in flight?

Onside Engine

Opposite side engine

APU (if available)

16

In manual mode will the cabin de pressurize on landing?

No

17

Can the cabin altitude be raised higher than 12,400 ft?

Yes, by using manual mode.

Cabin altitude will rise due to natural leak

18

What happens when the dump button is pressed?

Commands both ECS packs off

Opens OFV and raises the cabin to 12,400 feet at a rate of 2,000 fpm

(Recirculation fans also shut off)

19

Where does the CPC get landing Field elevation (LFE)?

FMS or can be manually selected

20

How many channels on the cabin pressure controller (CPC)?

2 channels, one active and one In standby mode

21

When is the Emergency Ram Air Ventilation activated?

Both packs commanded or failed OFF below 25,000 ft (via left side and electronically controlled)


Ram Air Pressure greater than cabin pressure (via right side)

22

What keeps the 3 avionic E-BAYs cool?

FWD & CTR E-BAY. 3 fans each pull air from cabin to bay


AFT E-BAY. Natural air-flow from cabin to bay

23

When are the recirculation fans commanded off?

Cockpit switch

Smoke detected in the recirculation bay

DUMP button is pressed

Respective pack is commanded off

24

Can a single bleed source power both packs?

Yes, through the crossbleed valve

25

Can a single pack provide adequate temperature control and pressurization

Yes, up to FL 310

26

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

2 independent packs (left and right)

Each engine provides bleed air to its respective pack

27

Do both loops have to function in order to detect an overheat condition?

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

28

What does the Overheat Detection System ODS observe?

Engine bleeds and packs

APU bleed

Plumbing for the wing and engine anti-icing system

29

What cools the precooler?

Ground. N1 fan

Flight N1 fan or ram air

30

What is the purpose of the precooler?

Cools the bleed air coming from the engine to the AMS.

31

What is normal pressure for any engine operation?

45 psi

32

Where is the bleed air tapped from the engine?

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

System alternates between valves to regulate an adequate and safe pressure

33

Can engine bleed air flow back to the APU?

No.

A check valve prevents flow-back

34

What is the primary use for APU bleed air?

ECS on the ground
Engine starting on the ground
Electrical source (

35

Where is the external ground source panel located?

Lower fairing between the wings

36

What is external pneumatic air used for?

ECS on the ground

Engine start on the ground