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Mesa 175 systems > air management system > Flashcards

air management system Flashcards

1
Q

what does the air management system consist of?

A

pneumatic system
environmental control system

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2
Q

what does the AMS use bleed air for?

A

ECS (heating and cooling)
Engine start
pressurization
engine and wing anti-ice
water pressure
hot air leak detection (?)

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3
Q

how many AMS controllers are installed?

A

One controller with 2 channels which control the respective onside system.
in case of channel failure - the remaining channel is able to control the entire pneumatic, air conditioning and anti-ice system

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4
Q

what provides bleed air for the AMS?

A

engine bleeds
APU bleed
External pneumatic source

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5
Q

what is external pneumatic air used for?

A

ECS on the ground
Engine start on the ground

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6
Q

Where is the external ground source panel located?

A

lower fairing between the wings

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7
Q

what is the primary use for APU bleed air?

A

ECS on the ground
Engine starting on the ground
Electrical source (< FL330)
Assist with engine start (< FL 210)
bleed source for pressurization, heating and cooling (<15,000 ft MSL)

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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 (Engine bleed valve) 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 pre-cooler

A

cools the bleed air coming from the engine to the AMS

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12
Q

what cools the pre-cooler?

A

Ground N1 fan
Flight N1 fan or RAM air

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13
Q

what does the overheat detection system (ODS) observe?

A

engine bleeds and packs
APU bleed
Plumbing for wing and engine anti-icing system

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14
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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15
Q

how many ECS packs are on the airplane? what provides air for the packs?

A

2 independent packs (pack 1 and pack 2)
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 FL 310

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17
Q

can a single bleed source power both packs

A

yes thru the cross bleed valve

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18
Q

what is the ratio of fresh air to recirculated air?

A

52% fresh to 48% recirculated air

19
Q

when are the recirculation fans commanded off?

A

cockpit switch
smoke detected in the recirc bay
DUMP button is pressed
respective pack is commanded off

20
Q

what keeps the 3 avionics E-BAY 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

21
Q

When is the Emergency Ram Air Ventilation activated?

A

Both packs commanded or failed OFF below 25,000 ft. MSL (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 (LFE)?

A

FMS or can be manually selected

24
Q

what happens when the dump button is pressed?

A

commands both ECS packs and recirc fans OFF
Opens OFV and raises the cabin to 12,400’ at a rate of 2,000 FPM

25
Q

Can the cabin altitude be raise higher than 12,400’?

A

yes by using 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

what is the bleed system priority in flight

A

onside engine
opposite side engine
APU (if available)

28
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 engien bleed pressure if not enough for engine start

29
Q

when will the cross bleed 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

30
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)

31
Q

When are ECS packs recovered?

A

TL not as MAX, and
airplane is 500 AFE with both engines operating
Airplane is >9,700 MSL with one engine operating

32
Q

what happens if smoke is detected in the recirculation bay?

A

both recirc fans deactivate
cargo recirc fan deactivates
cargo outflow valve closes

33
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 inputted

34
Q

what color is the LFE on the EICAS?

A

green FMS input
cyan manual input (an M will be in front of LFE)

35
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 > 5,000 AFE or >10,000 MSL

36
Q

When is the Engine bleed valve (EBV) commanded open?

A
  • respective bleed switch it set to AUTO
    -respective engine bleed is available
  • no fire is detected in the respective engine
  • no bleed duct leak is detected
  • During single AMS pack operation with both bleed valves available, the engine bleed valve associated to the inoperative pack is commanded to close and the crossbleed valve is commanded to open. The EICAS message BLEED 1 (2) OFF is not displayed in this condition.
37
Q

when is the APU bleed valve commanded open?

A

APU switch set to AUTO
APU bleed available
No APU and bleed duct leak
left engine bleed is unavailable
anti-ice system not requested (or anti-ice system requested ON and anti-ice system is failed)

38
Q

what does the overheat detection system consist of and provide?

A

overheat sensors and electronic control which provides rapid and reliable overheat and leak detection for the engine bleed, air conditioning ducts, APU bleed air distribution and anti-ice supply ducting

39
Q

what is the purpose of the emergency ram air ventilation and when is it open? (pack 1)

A

in case of pack shut down or for smoke removal.
open only if both ECS cooling packs are commanded OFF or failed OFF and plane altitude is less than 25,000’

40
Q

pack 2 - emergency ram air ventilation has a check valve that is open when?

A

when the pressure in the ram air circuit is great than the cabin pressure. open during smoke removal

41
Q

what does the cabin pressure control system consist of? what modes does it have?

A

automatic and manual modes
cabin pressure controller (CPC)
one cabin outflow valve (OFV)
one negative pressure relief valve (NPRV)
one positive pressure relief valve (PPRV)
static pressure port

42
Q

when does the NPRV open?

A

when differential pressure between the cabin and surrounding environment exceeds -.5 PSI

43
Q

when does the PPRV open?

A

when the differential pressure between the cabin and surrounding environment exceeds 8.6 PSI

44
Q

what are the two nominal differential pressures set by the CPCS? what altitudes set what pressures?

A

37000 and below, the nominal pressure is 7.8PSI
37,000 and above, the nominal pressure is 8.4 PSI

Mesa 175 systems (15 decks)

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