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E175 AIR MANAGEMENT SYSTEM (ECS) Flashcards

1
Q

What does the AMS use bleed air for?

A
  • ECS (heating & cooling)
  • Engine start
  • Pressurization
  • Engine and wing anti-ice
  • Water pressure
  • Hot air leak detection
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2
Q

How many AMS controllers are installed?

A

One controller with 2 channels which control the respective onside system

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3
Q

What happens if a channel fails?

A

The remaining channel is able to control the entire AMS

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4
Q

What provides air for the AMS?

A
  • Engine bleeds
  • APU bleed
  • External Pneumatic Source
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5
Q

What is bleed air used for?

A
  • ECS (heating & cooling)
  • Engine start
  • Engine and wing anti-icing
  • Water pressurization
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6
Q

What is external pneumatic air used for?

A
  • ECS on the ground

- Engine start on the ground

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7
Q

Where is the external ground source panel located?

A

Lower fairing between the wings

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8
Q

What is the primary use for APU bleed air?

A
  • ECS on the ground
  • Engine starting on the ground
  • Electrical source (< FL330)
  • Assist with engine start (< FL210)
  • Bleed source for pressurization, heating, and cooling (< 15,000 ft MSL)
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9
Q

Can engine bleed air flow-back to the APU?

A

No. A check valve prevents flow-back

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10
Q

Where is bleed air tapped from the engines?

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

- System alternates between valves to regulate an adequate and safe pressure

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11
Q

What is normal pressure for any engine operation?

A

45 psi

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12
Q

What isthe purpose of the pre-cooler?

A

Cools the bleed air coming from the engine to the AMS

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13
Q

What cools the pre-cooler?

A
  • Ground N1 fan

- Flight N1 fan or ram air

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14
Q

Whatdoes the Overheat Detection System (ODS) observe?

A
  • Engine bleeds and packs
  • APU bleed
  • Plumbing for the wing and engine anti-icing system
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15
Q

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

A

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

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16
Q

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

A
  • 2 independent packs (left and right)

- Each engine provides bleed air to it’s respective pack

17
Q

Can a single pack provide adequate temperature control and pressurization?

A

Yes, up to FL310

18
Q

Can a single bleed source power both packs?

A

Yes, through the crossbleed valve

19
Q

What is the ratio offresh air to recirculated air?

A

52% fresh air to 48% recirculated air

20
Q

When are the recirculation fans commanded off?

A
  • Cockpit switch
  • Smoke detected in the recirc bay
  • DUMP button is pressed
  • Respective pack is commanded off
21
Q

What keeps the 3 avionic E-BAYs cool?

A
  • FWD & CTR E-BAY
    1. 3 fans each pull air from cabin to bay
  • AFT E-BAY
    1. Natural air-flow from cabin to bay
22
Q

When is the EmergencyRam Air Ventilation activated?

A

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)

23
Q

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

A

2 channels, one active and one in standby mode

24
Q

Where does the CPC getLanding Field Elevation (LFE)?

A

FMS or can be manually selected

25
Q

What happens when the dump button is pressed?

A
  • Commands both ECS packs OFF

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

26
Q

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

A
  • Yes, by using manual mode

- Cabin altitude will rise due to natural leak

27
Q

In manual mode will the cabin depressurize on landing?

A

no

28
Q

What is the bleed system priority in flight?

A
  • Onside engine
  • Opposite side engine
  • APU (if available)
29
Q

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

A
  • APU has priority if
    1. Aircraft is on the ground
    2. Wheel speed < 50 kts
    3. Opposite engine bleed pressure is not enough for engine start
30
Q

When will the crossbleed valve automatically open?

A
  • Only one side bleed source is available
  • Engine 2 start in the air
  • Engine 1 start in the air if APU is not available
31
Q

What are some thingsthat will close the ECS packs?

A
  • 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 is OFF)
32
Q

When are ECS packs recovered?

A
  • TL not at MAX, and Airplane is 500 AFE with both engines operating
  • Airplane is > 9,700 MSL with one engine operating
33
Q

What happens if smoke is detected in the recirculation bay?

A
  • Both recirc fans deactivate
  • Cargo recirc fan deactivates
  • Cargo outflow valve closes
34
Q

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

A
  • FMS before takeoff or CPCS calculates using ambient pressure
  • LFE may be manually inputted
35
Q

What color is the LFE on the EICAS?

A
  • Green FMS input

- Cyan Manual input (an ‘M’ will be in front of LFE)

36
Q

What is the ABORT mode?

A

-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

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