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B737 > Air Conditioning > Flashcards

Air Conditioning Flashcards

1
Q

where is the flight deck air sourced from

A

left pack outflow upstream of the mix manifold

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2
Q

what air is delivered to the mix manifold

A
  • excess air from the left pack
  • right pack
  • air from recirculation system
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3
Q

what is a single pack operating in high flow capable of pressurizing the cabin to

A

41,000’

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4
Q

how many packs is the APU capable of supplying

A
  • on ground = 2
  • in flight = 1
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5
Q

how many packs can be supplied by 1 engine bleed system

A

1

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6
Q

when does the ram air inlet door fully open

A
  • on ground
  • slow flight with flaps out
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7
Q

when in cruise, in what position are the ram air inlets doors

A

modulate between open and close

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8
Q

what are the deflector doors’ purpose

A

installed forward of the ram air inlet doors to prevent slush ingestion during takeoff and landing

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9
Q

what controls the deflector doors

A

air-ground safety sensor

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10
Q

what controls the pack temperature control valves

A

electronic controllers command the pack temperature control valves to satisfy the demands

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11
Q

what happens if the primary pack control fails

A

affected pack is controlled by the standby pack in the opposite controller

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12
Q

what happens if the primary and standby pack controls fail for the same pack

A

the pack will continue to operate without control unless excessive temperatures cause the pack to trip off

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13
Q

what indications occur when a primary OR standby pack control fails

A
  • PACK
  • MC
  • AIR COND system annunciator during recall
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14
Q

what indications occur when the primary AND standby pack controls fail for the same pack

A
  • PACK
  • MC
  • AIR COND system annunciator
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15
Q

how many temperature control zones are there

A

3:
- flight deck (CONT CAB)
- FWD
- AFT

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16
Q

what are the selectable temperature ranges for each zone

A

18 - 30

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17
Q

how is the temperature modulated for each zone

A
  • packs output lowest temperature demand
  • each zone receives trim air to the respective zone supply ducts controlled by the trim air modulating valves
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18
Q

how is the temperature controlled in single pack operation (with trim air)

A

same as dual pack operation

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19
Q

how is the temperature controlled in single pack operation (no trim air)

A

pack output temperature will try command the average of all 3 zones

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20
Q

what happens if a zone supply duct overheat occurs

A
  • “ZONE TEMP” light will illuminate
  • associated trim air modulating valve will automatically shut
  • reset is possible after the zone supply duct cools and the “TRIP RESET” button is pressed
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21
Q

what temperature zones do each electronic controller control

A
  • left electronic controller controls:
    • flight deck standby
    • AFT cabin
  • right electronic controller controls:
    • flight deck primary
    • FWD cabin
22
Q

what happens following failure of the primary temperature flight deck control (system setup/indications)

A
  • auto switches to backup
  • CONT CAB “ZONE TEMP” light will illuminate upon MC recall
23
Q

what happens following failure of the primary AND standby temperature flight deck control (system setup/indications)

A
  • CONT CAB “ZONE TEMP” will illuminate immediately
24
Q

what happens following the failure of the FWD OR AFT temperature control (system setup/indications)

A
  • associated trim air modulating valves close automatically
  • FWD and AFT temperature selectors are averaged
  • “ZONE TEMP” when MC recall
25
Q

what will cause the temperature control system to operate the PACKS independently

A

any failure affecting the supply of trim air

26
Q

what happens if flight deck trim air is lost (pack output temperature)

A
  • left pack will provide conditioned air to the flight deck at the selected temperature
  • right pack will provide conditioned air to the cabin at the temperature requiring the most cooling
27
Q

what happens if a cabin zone trim air OR all trim air is lost (pack output temperature)

A
  • left pack will provide conditioned air to the flight deck at the selected temperature
  • right pack will provide conditioned air to the cabin at the FWD and AFT averaged temperature
28
Q

what happens if any individual zone is switched off

A

temperature selector will be ignored

29
Q

what happens if all zone controls and primary pack controls fail (standby pack control)

A
  • standby pack controls command the pack to produce air temperatures which will satisfy the average temperature demand of the 2 cabin zones
  • trim air modulating valves will close
  • flight deck zone temperature selector will have no effect on the standby pack controls
30
Q

what happens if all temperature selectors are OFF (fixed temperature)

A
  • left pack output temperature = 24
  • right pack output temperature = 18
    as measure at the pack temperature sensor
31
Q

where does the cabin air distribute

A

cabin sidewall risers then to the overhead distribution duct then to the sidewall diffusers
-sidewall diffusers and overhead distribution duct send air to cabin

32
Q

what are the recirculation fans’ purpose

A

reduce the pack and bleed loads by recirculating cabin air

33
Q

where are the recirculation fans

A

forward cargo bay

34
Q

how do the recirculation fans operate in AUTO

A
  • IN FLIGHT:
    • left fan operates if BOTH packs are operating (unless either PACK - HIGH)
    • right fan operates if BOTH packs are operating (unless BOTH PACK - HIGH)
  • ON GROUND:
    • left fan operates unless BOTH PACK - HIGH
    • right fan operates even if BOTH PACK - HIGH
35
Q

what parts of the flight deck are part of the equipment cooling system

A
  • electronic equipment
  • E + E bay
36
Q

what 2 ducts are part of the equipment cooling system

A
  • supply duct
  • exhaust duct
37
Q

how many fans are there in each cooling equipment duct

A

2 (normal and alternate)

38
Q

after selecting the equipment cooling ALTN fan how long will it take for the “OFF” light to extinguish

A

approximately 5s

39
Q

what happens to the equipment cooling fans in the event of a FWD CARGO FIRE warning

A

(832 and beyond)
- equipment cool exhaust fan is turned off
- equipment cooling exhaust “OFF” light is inhibited

40
Q

what happens if an equipment cooling overtemp occurs on the ground

A

call horn from in the nose wheel well

41
Q

when the overboard exhaust valve is closed what happens to the equipment cooling system’s air

A

air from the equipment cooling is diffused into the FWD cargo compartments lining and recirculated back into the mix manifold for additional heating.

42
Q

where does external air flow to

A

directly into the mix manifold

43
Q

“ZONE TEMP” light

A

illuminated amber:
- CONT CAB: duct temp overheat OR failure of the primary flight deck and standby temperature control
- FWD CAB OR AFT CAB: duct temp overheat
during master caution recall:
- CONT CAB: failure of flight deck primary or standby temperature control
- either FWD CAB OR AFT CAB: failure of associated zone temperature control
- lights will extinguish when MC is reset

44
Q

what does selecting the zone “temperature selector” to OFF do

A

closes the associated trim air modulating valve

45
Q

“RAM DOOR FULL OPEN” light

A

indicates ram door in full open position

46
Q

“AIR CONDITIONING PACK” sw

A
  • OFF = pack signaled off
  • AUTO:
    • both packs operating - each pack = low flow
    • 1 pack operating - operating pack = high flow in flight with flaps up
    • 1 pack operating from APU (both ENG BLEED AIR sw - OFF) = high flow
  • HIGH:
    - pack regulates to high flow
    • provides max flow rate on ground with APU BLEED air switch ON
47
Q

“TRIM AIR” sw

A
  • ON = trim air pressure regulating and shutoff valve open
  • OFF = trim air pressure regulating and shutoff valve close
48
Q

“RECIRCULATION (RECIRC) FANS” sw

A
  • OFF = fan signaled off
  • AUTO:
    • in flight:
      • left recirculation fan operates if BOTH PACKS are operating unless EITHER PACK operating in HIGH
      • right recirculation fan operates if BOTH PACKS are operating unless BOTH PACKS operating in HIGH
    • on ground:
      • left recirculation fan operates UNLESS BOTH PACKS operating in HIGH
      • right recirculation valve operates even if BOTH PACKS operating in HIGH
49
Q

“PACK” light

A
  • indicates pack trip off or failure of both primary and standby pack controls
  • during master caution recall = indicates failure of either primary or standby pack control (extinguishes when master caution is reset)
50
Q

“TRIP RESET” switch

A

if condition is corrected, pushing will:
- reset “BLEED TRIP OFF, PACK, ZONE TEMP” lights
- related engine bleed air valve opens, or related pack valve opens or related trim air modulating valve opens
lights remain illuminated until reset

51
Q

equipment cooling “OFF” lights

A

no airflow from the selected cooling supply/exhaust fan

B737 (10 decks)

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