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Mesa ERJ E-JET 175 > Air Management System > Flashcards

Air Management System Flashcards

1
Q

Can a single pack provide adequate temperature control and pressurization?

A

Yes

(up to FL310)

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2
Q

What is the normal pressure for any engine operation?

A

45 psi

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3
Q

What is the primary use for APU bleed air?

A
  • APU bleed air
  • ECS on the ground
  • Engine start on the ground
  • Electrical source (< FL330)
  • Assist with engine start (< FL210)
  • Bleed source for pressurization and packs (< 15,000 ft)
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4
Q

Where does the CPC get landing field elevation?

A

FMS

( can be manually selected )

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5
Q

What happens when the Dump Button is depressed?

A

Opens the OutFlow Valve

Commands the Packs and Recirc Fans off

A White Bar illuminates on the button

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6
Q

What keeps the 3 avionics E-bays cool?

A

FWD and CTR:

  • 3 fans each pull from cabin to bay

AFT:

  • Natural air flow from cabin to bay
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7
Q
A
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8
Q

Can a single bleed source power both packs?

A

Yes

( through the crossbleed valve )

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9
Q

In manual mode will the cabin depressurize on landing?

A

No

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10
Q

What are some conditions 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 source not available for the pack
  • Thrust lever set to max on T/O
  • REF ECS set to off on MCDU (APU is off)
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11
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
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12
Q

What does the overheat detection system (ODS) observe?

A

Overhead and Leak Detection for:

Engine Bleeds

AC Ducts

APU Bleed Air Distribution

Anti-Ice Supply Ducting

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13
Q

When will the crossbleed valve automatically open?

A
  • Only one side bleed source available
  • Engine 2 start in the air
  • Engine 1 start in the air IF APU is not available
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14
Q

Where is the bleed air tapped from the engines?

A

6th and 10th stage (EBV and HSV respectively)
System alternates between valves to regulate an adequate and safe pressure

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15
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 > 5000 AFE or > 10000 MSL
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16
Q

What provides air for the AMS?

A
  • Engine bleeds
  • APU bleed
  • External pneumatic source
17
Q

When are ECS packs recovered?

A
18
Q

Can engine bleed air flow back to the APU?

A

No

(check valve prevents flowback)

19
Q

How many AMS controllers are there?

A

One controller with 2 channels which

control their respective onside system

20
Q

What color is the LFE on the EICAS?

A
  • Green FMS input
  • Cyan manual input (an “M” will be in front of LFE)
21
Q

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

A

2

( one active and one in standby mode )

22
Q

What happens when the dump button is pressed?

A
  • Commands both ECS packs off
  • Opens OFV and raises cabin to 12400ft at 2000fpm
23
Q

When are the recirc fans commanded off?

A
  • Cockpit switch
  • Smoke detected in the recirc bay
  • DUMP button is pressed
  • Respective pack is commanded off
24
Q

What is the bleed system priority in flight?

A
  • Onside engine
  • Offside engine
  • APU
25
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 its respective pack)

26
Q

When is the emergency ram air ventilation activated?

A
  • Both packs commanded off or failed < FL250 (left side electronically controlled)
  • Ram Air pressure greater than cabin pressure (right side)
27
Q

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

A

No. Though Dual Loop is Normal. But if a single loop fails the remaining monitors the system

28
Q

What is the ratio of fresh air to recycled air?

A

52% fresh

48% recycled

29
Q

What happens if smoke is detected in the recirculation bay?

A
30
Q

What is bleed air used for?

A
  • ECS heating and cooling
  • Engine start
  • Engine and wing A/I
  • Water pressurization
31
Q

Where is the external ground source panel located?

A

Lower fairing between the wings

32
Q

What cools the pre-cooler?

A
33
Q

What is the AMS used for?

A
  • ECS ( Heating and Cooling)
  • Engine start
  • Pressurization
  • Engine and wing A/I
  • Water pressure
  • Hot air leak detection
34
Q

Can the altitude be raised higher than 12400ft?

A

Yes

( Using manual mode, cabin altitude will rise due to a natural leak )

35
Q

What is the purpose of the precooler?

A

Cools the bleed air supplied to the AMS

36
Q

Which bleed source, Engine or APU, has priority?

A

The APU has priority IF:

  • Aircraft is on ground
  • Wheel speed <50 kts

( Offside engine bleed psiis not enough for engine start)

37
Q

What happens if a channel fails?

A

The remaining channel is able to control the entire AMS

Mesa ERJ E-JET 175 (27 decks)

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