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E-Jet EMB175 > ECS Questions > Flashcards

ECS Questions 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 detect
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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
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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 engine?

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

- System alternates between valves to regulates and adequate and safe pressure.

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11
Q

What is normal pressure for engine operation?

A

45 psi

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12
Q

What is the 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

What does 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 & right)

- Each engine provides bleed air to its 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, up to FL310

19
Q

What is the ratio of fresh air to recirculation air?

A
  • 52% fresh air to 48% recirculated
20
Q

When are the recirculation fans commanded off?

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

What keeps the 3 avionic E-BAY’s cool?

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

- AFT E-BAY natural air-flow from cabin to bay

22
Q

When is the Emergency Ram 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 dose the CPC get Landing 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 ft at a rate of 2,000 FPM

26
Q

Can the cabin altitude be raised hight then 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
    • Aircraft is on the ground
    • Wheel speed < 50 kts
    • Opposite engine bleed pressure is not enough for engine start
30
Q

When will the crossbreed 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 things that 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 record fans deactivate
  • Cargo record fan deactivates
  • Cargo outflow valve closes
34
Q

Where does the CPCS get cruise flight live & 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 stop climbing and begins a descent, and
    • Airplane has not climbed > 5,000 AFE or > 10,000 MSL

E-Jet EMB175 (30 decks)

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