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Mesa EJET > Air Management System > Flashcards

Air Management System Flashcards

1
Q

Air Management Systems consists of what?

A
  • Pneumatics
  • Environmental control system
  • Pressurization
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2
Q

AMS get air from?

A

Engines, APU or external air source

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3
Q

Pneumatics uses air for what?

A
  • ECS
  • Engine start
  • Pressurization
  • Anti-Ice (APU bleed not used for A/I)
  • Water pressure
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4
Q

What stages does bleed air come from engines?

A

6th (low) and 10th (high) stages of the compressor

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5
Q

Do both packs need to be turned off when using external air for engine start?

A

Yes

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6
Q

Where do the packs get air from?

A

Pack 1, engine 1

Pack 2, engine 2

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7
Q

Bleed logic

A

Onside, opposite side, APU

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8
Q

Recirc fans purpose?

A

Reduce load on packs by mixing already conditioned air with incoming cabin/cockpit air (52% fresh to 48% recirculated air)

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9
Q

Emergency RAM air enters the left side of system through a valve if?

A

Inflight and both packs off/failed and below 25,000’

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10
Q

Positive pressure relief valve (PPRV) opens when?

A

Cabin pressure reaches 8.6 psi

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11
Q

Dump function

A
  • Only works in auto mode
  • Shuts OFF packs and recirculation fans
  • Allows cabin to climb to max altitude of 12,400 feet @ 2000 fpm climb rate
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12
Q

CABIN ALT HI warning when?

A

9700’

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13
Q

How many AMS controllers are installed?

A

1 controller with 2 channels which control the respective onside system

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14
Q

What happens of an AMS controller channel fails?

A

The remaining channel can control entire AMS

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15
Q

What provides air for AMS?

A

Engine bleeds, APU bleed, external air source

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16
Q

Can engine bleed flow back to APU?

A

No, a check valve prevents flow back

17
Q

What is normal pressure for any engine operation?

A

45 psi

18
Q

Purpose of pre-cooler?

A

Cools bleed air coming from engine to AMS

19
Q

What does overheat detection system observe?

A
  • Engine bleeds and packs
  • APU bleed
  • Plumbing for the wing and engine anti-ice
20
Q

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

A

Yes, unless one fails, the other will work alone

21
Q

How many ECS packs are on the plane?

A

2,left and right (each engine provides bleed air to respective pack)

22
Q

Can a single pack provide adequate temperature control and pressurization?

A

Yes, up to FL310

23
Q

Can a single bleed source power both packs?

A

Yes, through a cross bleed valve

24
Q

When are the recirculation fans commanded off?

A
  • Cockpit switch
  • Smoke detected in the recirculation bay
  • Dump button is pressed
  • Respective pack commanded off
25
Q

What keeps the 3 avionics E-BAYS cool?

A

FWD and CTR E-BAY, 3 fans pull cabin air to bay

AFT E-BAY, natural airflow from cabin to bay

26
Q

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

A

APU has priority if

  • Aircraft is on ground
  • Wheel speed less than 50 knots
  • Opposite engine bleed pressure is not enough for engine start
27
Q

When will the cross bleed valve automatically open?

A

Only one side bleed source available

Engine 2 start in air

Engine 1 start in the air if APU not available

28
Q

Negative pressure relief valve opens when?

A

Opens automatically when outside (ambient) pressure > cabin pressure

29
Q

Positive pressure relief valve opens?

A

Opens when cabin pressure reaches 8.6 psi

30
Q

What are some things that will close the packs?

A
  • Any engine start if APU is the bleed source
  • Engine start on ground
  • Respective bleed system duct leak
  • Bleed source not available for pack
  • Thrust levers set to MAX on takeoff
  • REF A/I set to ALL on takeoff
  • REF ECS set to OFF on MCDU (APU is OFF)
31
Q

When are ECS packs recovered?

A

Thrust levers not at MAX, and

  • Airplane is 500 AFE with both engines operating
  • Airplane is > 9,700 MSL with one engine operating

Mesa EJET (10 decks)

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