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self study > Air Conditioning and pressurization > Flashcards

Air Conditioning and pressurization Flashcards

1
Q

What systems does the bleed air supply?

A

Air conditioning
Pressurisation
Hydraulic reservoir pressurisation
Water tank pressurisation
Engine starting
Aspirated TAT probe
Anti icing

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2
Q

When will the DUAL BLEED light illuminate?

A

Engine bleed valve open and,
APU bleed valve open and,
Thrust levers idle

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3
Q

Why is the 9th stage bleed valve closed under DUAL BLEED configuration?

A

To prevent excessive pressure in the bleed manifold causing back pressure on the APU bleed valve

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4
Q

What must the crew not do when DUAL BLEED is illuminated?

A

Advance thrust levers from idle as the 9th stage valve will open and potentially damage the APU valve

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5
Q

If the external air cart is connected, why must the battery be kept on?

A

Protective circuits are DC

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6
Q

How should the bleed air panel be configured with the external cart connected?

A

Packs - auto
Recirc fans - auto
Isol valve - open
APU bleed air - OFF

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7
Q

When does the 9th stage bleed valve open?

A

When 5th stage bleed air pressure is not sufficient

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8
Q

What purpose do the engine bleed valves serve?

A

Pressure regulating and SOVs

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9
Q

When do the engine bleed valves reduce outflow?

A

when bleed air temperature is too high

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10
Q

What does an illuminated BLEED TRIP OFF light indicate?

A

Excessive bleed air pressure or temperature. Bleed valve will trip closed.
MC for AIR COND

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11
Q

What does a PACK light illuminated mean?

A

pack tripped off due to overheat or failure of both pack controllers

MC for AIR COND

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12
Q

In what cases will the PACK light illuminate on master recall?

A

failure of either pack controller

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13
Q

What does an illuminated left WING BODY OVERHEAT indicate?

A

Overheat from bleed duct leak in the following areas:
-APU bleed air
- inboard wing LE duct
-keel beam
-a/c bay
-engine strut

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14
Q

What does an illuminated right WING BODY OVERHEAT indicate?

A

Overheat from a bleed duct leak:
-inboard wing LE duct
-a/c bay
-engine strut

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15
Q

When the isolation valve is in AUTO, when will it be open?

A

Both engine bleed air valves ON and both packs AUTO/HIGH

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16
Q

When will the isolation valve automatically close in AUTO?

A

Either engine bleed air valve is closed or pack is switched off

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17
Q

If the engine bleed air valve is opened at the gate with engines shut down, will the valve open?

A

No

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18
Q

What does the TRIP RESET switch do?

A

allows the BLEED AIR TRIP, PACK and ZONE TEMP lights to be reset if fault has been corrected

19
Q

Where does excess left pack air go?

A

combines with recirculated air in the mix manifold

20
Q

Where is mixed air distributed?

A

cabin side wall riser outlets

21
Q

What are the limitations on APU supplying the packs?

A

can supply both packs on the ground, only one pack inflight

22
Q

What are the limitations for engine bleeds supplying the packs?

A

Each engine bleed may only supply 1 pack

23
Q

With the PACKS in AUTO, when will they go to high flow?

A

Single pack operation or engine bleeds closed with APU bleed open

24
Q

When is automatic pack switching inhibited?

A

when flaps are extended or on the ground

25
Q

What does a CONT CAB, ZONE TEMP light indicate?

A

failure of both flight deck primary and standby temp controllers or duct temp overheat

26
Q

What does a FWD/AFT CAB, ZONE TEMP light indicate?

A

Duct overheat only

27
Q

What does a ZONE TEMP light on MC recall for CONT CAB indicate?

A

Failure of either temperature controller

28
Q

What does a ZONE TEMP light on MC recall for FWD/AFT indicate?

A

Failure of zones associated temp controller

29
Q

What does turning a temperature selector off do?

A

closes associated trim air modulating valve. Turning off a single selector will ignore that selector only

30
Q

What will happen if all temperature selectors are switched off?

A

left pack output set to 75 F and right pack to 65F

31
Q

What is the output temperature range with selectors in AUTO?

A

65F to 85F

32
Q

What is the purpose of the recirculation fan?

A

Recycle some cabin air to the mixer manifold to relieve bleed air demand

33
Q

If the left recirculation fan is in AUTO during flight, when will the fan turn off?

A

Either pack switch is in HIGH

34
Q

If the right recirculation fan is in AUTO during flight, when will the fan turn off?

A

Both pack switches are in HIGH

35
Q

If the left recirculation fan is in AUTO on the ground, when will the fan turn off?

A

If both pack switches are in HIGH

36
Q

If the right recirculation fan is in AUTO on the ground, when will the fan turn off?

A

Fan operates regardless of switch positions

37
Q

Where is the pre conditioned air distributed to?

A

Directly to the mixer manifold, bypassing the packs

38
Q

Describe the cooling cycle

A

Hot bleed air is pre conditioned with ram air

Flows through the air cycle machine for refrigeration

Mixes with hot bleed bypass air

Flows through the water separator

Conditioned air then goes to the distribution system/mixer manifold

39
Q

If both temperature controllers fail for the same pack, will it continue to operate?

A

Yes, unless an overtemperature condition trips it off

40
Q

What are the zones for temperature control?

A

CONT CAB - flight deck
FWD CAB - forward cabin
AFT CAB - aft cabin

41
Q

What are the primary and standby temperature controllers for the flight deck?

A

Primary - right controller
standby - left controller

42
Q

What are the primary and standby temperature controllers for the forward cabin?

A

Primary - right controller
standby - nil

43
Q

What are the primary and standby temperature controllers for the aft cabin?

A

Primary - left controller
standby - nil

44
Q
A

self study (12 decks)

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