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Republic E170 > Air Management System > Flashcards

Air Management System Flashcards

1
Q

The Air Management System (AMS) consists of:

A
  • pneumatic system

- environmental control system (ECS)

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2
Q

What does the AMS controller do?

A

provides primary control for various airplane subsystems such as

  • bleed control
  • environmental control
  • hot air leak detection
  • crew oxygen monitoring
  • wing ice protection
  • engine anti-ice
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3
Q

How many channels does the AMS controller have?

A

two; control the respective onside system; in case of failure one controller is capable of controlling entire system

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4
Q

PACK (1 or 2) button PUSH IN

A

allows automatic operation by the AMS; system logic opens pack 1 or 2 flow control valve

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5
Q

PACK (1 or 2) button PUSH OUT

A

manually closes the pack 1 or 2 flow control valve

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6
Q

RECIRC FAN button PUSH IN

A

allows automatic operation by the AMS; system logic turns on both recirc fans

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7
Q

RECIRC FAN button PUSH OUT

A

turns off both recirculation fans

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8
Q

XBLEED button PUSH IN

A

allows automatic operation by the AMS

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9
Q

XBLEED button PUSH OUT

A

manually closes the crossbleed

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10
Q

BLEED 1/2 button PUSH IN

A

allows automatic operation by the AMS;

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11
Q

BLEED 1/2 button PUSH OUT

A

manually closes engine blead; when a leak is detected, and amber light illuminates on the top half of the button

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12
Q

APU BLEED button PUSH IN

A

allows automatic operation by the AMS

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13
Q

APU BLEED button PUSH OUT

A

closes the APU bleed valve; when a leak is detected, an amber light illuminates on the top half of the button

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14
Q

DUMP button

A

provides rapid cabin depressurization by opening the outflow valve and commanding the packs and the recirculation fan off

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15
Q

Bleed air is used by:

A
  • environmental control system (ECS)
  • engine start
  • engine and wing anti-ice
  • water pressurization
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16
Q

How is bleed source automatically controlled

A

via opening/closing of the Low Pressure Check Valve and of the High Stage Bleed Valve located in the nacelle

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17
Q

How is engine bleed air temperature regulated

A

by a precooler which uses the engine fan air modulated by the Fan Air Valve (FAMV)

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18
Q

The Engine Bleed Valve is commanded open when the following conditions occur simultaneously:

A
  • respective bleed switch set to AUTO
  • respective engine bleed is available
  • no fire is detected in the respective engine
  • no bleed duct leak is detected
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19
Q

When does the bleed system automatically shut down

A

when a leak, overpressure or fail condition is identified

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20
Q

The APU Bleed Valve (ABV) is commanded open when the following conditions occur simultaneously:

A
  • APU switch is set to AUTO
  • APU bleed is available
  • No APU and left bleed duct leak
  • left engine bleed is unavailable
  • anti-ice system not requested
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21
Q

The cross bleed is commanded open when the XBLEED button is pushed in (AUTO) and any of the following conditions are met:

A
  • one side provides manifold pressure and there is not a bleed air source on the opposite side
  • APU bleed button pushed out for main engine start
  • engine #2 start in the air
  • APU bleed OFF for engine #1 start in the air
  • no bleed leak, unless starting the engine
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22
Q

When will the engine bleed #1 be commanded closed

A

if the cross bleed fails OPEN and the other bleed source is the #2 engine

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23
Q

Describe the Overheat Detection System

A

comprised of overheat sensors and electronic controls; six zones of dual loop overheat sensors; both loops must detect overheat or leak unless one has failed

24
Q

The recirculation fans are commanded off when:

A
  • the DUMP button is pressed
  • smoke is detected in the recirc bay
  • both packs are commanded OFF
  • on ground cabin warm-up mode when the APU is the bleed source
  • the cargo bay fire signal activates
25
Q

How many EBAY fans?

A

FWD EBAY - three fans, draws air from the cockpit
Center EBAY - three fans, draw air from rear cabin return
AFT EBAY - zero fans, air from pax cabin is directed towards underfloor recirc bay

26
Q

Explain the emergency ram air ventilation

A

flight deck pack emergency ram air valve is commanded OPEN only if both ECS cooling packs are commanded or fail OFF and altitude is less than 25,000 ft

27
Q

The AMS Controller logic provides automatic control of:

A

engine bleed, APU bleed, ECS packs, anti-ice systems, pressurization and recirculation bay smoke detection

28
Q

What does the CPCS do

A

Cabin Pressure Control System controls cabin pressurization

29
Q

The CPCS system consists of:

A
  • cabin pressure controller (CPC)
  • one cabin outflow valve (OFV)
  • one negative pressure relief valve (NPRV)
  • one positive pressure relief valve (safety valve)
  • static pressure port
30
Q

Describe the Cabin Pressure Controller (CPC)

A

controls cabin pressure by sending a command to the outflow valve to modulate airflow through the valve to maintain aircraft pressurization; has two fully independent automatic channels that alternate following each flight

31
Q

The Negative Pressure Relief Valve (NPRV) opens if:

A

differential pressure between cabin and surrounding environment exceed -0.5 psi

32
Q

The Positive Pressure Relief Valve opens if:

A

differential pressure exceeds 8.6 psi

33
Q

CABIN ALTITUDE HI warning

A

cabin altitude is equal to or higher than 9,700 ft.

34
Q

AMS CTRL FAIL caution

A

both AMS controller channels have failed. AMS controller is not in control

35
Q

BLEED 1 or 2 FAIL caution

A

a bleed failure has been detected. bleed is no longer available

36
Q

BLEED 1 or 2 LEAK caution

A

an overheat condition has been detected at the associated bleed system or pack

37
Q

BLEED 1 or 2 OVERPRESS caution

A

an overpressure condition has been detected at the associated bleed system or pack

38
Q

BLEED APU LEAK caution

A

an overheat condition has been detected in the APU bleed or both APU overheat detection system loops have failed

39
Q

CABIN DIFF PRESS FAIL caution

A

cabin differential pressure is higher than 8.5 psid or lower than -0.3 psid

40
Q

CENTER EBAY FAN FAIL caution

A

center ebay fans have failed

41
Q

CRG FWD VENT FAIL caution

A

forward cargo fan has failed ON or if the cargo shutoff valve is failed OPEN associated with smoke detected in the cargo compartment

42
Q

FWD EBAY FANS FAIL caution

A

forward ebay fans have failed

43
Q

PACK 1 or 2 FAIL caution

A

associated pack is no longer available

44
Q

PACK 2 LEAK caution

A

an overheat condition has been detected at the bleed duct

45
Q

PRESN AUTO FAIL caution

A

both pressurization controller channels have failed in their automatic mode

46
Q

PRESN MAN FAIL caution

A

both pressurization controller channels have failed in their manual mode

47
Q

RECIRC SMK DET FAIL caution

A

smoke detector has failed

48
Q

RECIRC SMOKE caution

A

smoke has been detected in the recirculation bay

49
Q

AMS CTRL FAULT advisory

A

one of the two AMS controller channels has failed

50
Q

BLEED 1 or 2 OFF advisory

A

associated bleed is turned off

51
Q

PACK 1 or 2 OFF advisory

A

associated pack is off inflight

52
Q

PRESN AUTO FAULT advisory

A

loss of automatic mode redundancy, one CPCS controller channel has failed

53
Q

RAM AIR FAULT advisory

A

forward emergency ram valve has failed closed

54
Q

XBLEED FAIL advisory

A

either bleed isolation valve has failed closed and cross bleed is no longer available, or the bleed isolation valve failed open and engine is the source for the right side bleed (bleed 2)

55
Q

XBLEED SW OFF advisory

A

bleed isolation button has been pushed out

Republic E170 (22 decks)

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