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RJET E170/175 Official Study Guide 2016 > Air Management > Flashcards

Air Management Flashcards

1
Q

What does the AMS provide?

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

What happens if the active channel fails on the AMS controller?

A

The other channel is able to control the entire AMS

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3
Q

What provides air for the AMS?

A
  • engine bleeds
  • APU bleed
  • external pneumatic source
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4
Q

What is bleed air used for?

A
  • ECS (heating and cooling)
  • engine start
  • engine and wing anti ice
  • water pressure
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5
Q

What is external pneumatic air used for?

A
  • ECS on ground

- engine start on ground

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6
Q

Where is the external ground source panel located?

A

Lower fairings between the wings

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7
Q

What is the primary use for APU bleed air?

A
  • ECS on the ground

- Engine start on the ground

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8
Q

Can engine bleed air flow back to the APU?

A

No, a check valve prevents flow-back

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9
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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10
Q

What is normal pressure for any engine operation?

A

45 psi

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11
Q

What is the purpose of the precooler?

A

Cools the bleed air coming from the engine to the AMS

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12
Q

What cools the preschooler?

A

Ground - N1 fan

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13
Q

What does the Overheat Detection System observe?

A
  • Engine bleeds and packs
  • APU bleed
  • Plumbing for the wing and anti-ice system
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14
Q

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

A

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

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15
Q

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

A
  • 2 independent packs (L and R)

- Each engine provides bleed air to its respective pack

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16
Q

Can a single pack provide adequate temperature control and pressurization?

A

Yes, up to FL310

17
Q

Can a single bleed source power both packs?

A

Yes, through the crossbleed valve

18
Q

What is the ratio of fresh air to recirculated air?

A

52% fresh, %48 recirculated

19
Q

When are the recirculation fans commanded off?

A
  • Cockpit switch
  • Smoke detected in the recirc bay
  • DUMP button
  • Respective pack commanded off
  • Fire detected in the cargo bay
20
Q

What keeps the 3 avionic EBAYs cool?

A
  • FWD and CTR: 3 fans each pull air from cabin to bay

- AFT EBAY: Natural air flow from cabin to bay

21
Q

When is the emergency ram air ventilation activated?

A
  • Both packs commanded off below 25,000 ft (via left side and electronically controlled)
  • Ram air pressure greater than cabin pressure (via right side)
22
Q

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

A

2 channels, one active and one in standby mode

23
Q

Where does the CPC get landing field elevation?

A

FMS or can be manually selected

24
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 2000 fpm

25
Q

Can the cabin altitude be raised above 12,400 ft?

A
  • Yes, by use of the manual mode

- Cabin altitude will rise due to natural leak

26
Q

In manual mode will the cabin depressurize on landing?

A

No

27
Q

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

A

APU has priority if:

  • APU BLEED and XBLEED buttons are set to AUTO
  • APU BLEED and XBLEED valves are functioning normally
  • Wheel speed < 50 kts
  • REF ECSOFF and REF A/I not ALL, or single engine taxi
28
Q

When will the crossbreed valve open automatically?

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
  • APU BLEED button pushed out for engine start
29
Q

When and how will the system turn off an ECS pack?

A
  • The AMS can command a pack off due to air supply source and bleed valve position, or:
  • The FADEC can send a signal to the AMS commanding pack off when it is required for engine performance
30
Q

When are ECS packs recovered?

A

The ECS packs are recovered at an altitude where the performance is no longer required (or in the case of two engines, TL is reduced below TOGA)

31
Q

What happens if smoke is detected in the recirculation bay?

A
  • Both recirculated fans deactivate
  • Cargo recirculated fan deactivates
  • Cargo outflow balve closes
32
Q

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

A

FMS before takeoff or CPCS calculates using ambient pressure

- LFE may be manually input

33
Q

What color is the LFE on the EICAS?

A
  • Green: FMS input

- Cyan: Manual input (plus and ‘M’ will be in front of LFE)

34
Q

What is the ABORT mode?

A

Cabin is selected 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

RJET E170/175 Official Study Guide 2016 (17 decks)

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