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737 Systems > Air Systems > Flashcards

Air Systems Flashcards

1
Q

What is controlled by the left electronic controller?

A
  • Left pack (primary control)
  • Right pack (secondary control)
  • Control cabin (backup temp control)
  • Aft cabin zone (temp control)
  • Left ram air drive
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2
Q

What is controlled by the right electronic controller?

A
  • Right pack (primary control)
  • Left pack (secondary control)
  • Control cabin (primary temp control)
  • Fwd cabin zone (temp control)
  • Right ram air drive
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3
Q

What happens if primary control of a pack fails?

A

It is controlled by the standby pack control (located in the opposite controller). The PACK Light (along with M/C and AIR COND System Annunciator Lights) will illuminate during M/C Recall if a single pack control fails.

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4
Q

What happens if primary and standby controls fail for the same pack?

A

The PACK Light illuminates (along with M/C and AIR COND System Annunciator Lights) and the pack continues to operate without control unless it trips due to overheat.

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5
Q

When do the packs produce an increased flow level?

A

High flow
• When you select it (switch in HIGH), or
• When an engine bleed is supplying a single pack in flight with flaps up, or
• When the APU is supplying one or both packs with Engine BLEED Switches OFF

APU (max) high flow
• When either PACK Switch in HIGH and APU BLEED Air Switch ON while on the ground only

In any other configuration, packs produce normal (low) flow

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6
Q

May packs be selected to HIGH for takeoff, approach, or landing?

A

No

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7
Q

May an engine bleed be used as a single bleed source for two packs?

A

Normally,
No — Do not operate more than one pack from one engine (OM2 2.31.1)
But, during taxi-out on ground only…
Yes — Both A/C packs can be operated with one engine operating and with the isolation valve open. However, cabin airflow may be less than normal, depending on engine power level. If temperature control is not adequate, air conditioning performance improves with both engines running or with the APU operating (OM1 Taxi-Takeoff 10.3)

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8
Q

May the APU be used as a single bleed source for two packs?

A

Yes, on the ground only

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9
Q

What is indicated by the DUAL BLEED Light?

A

APU bleed valve open and Engine 1 BLEED Air Switch ON, or

APU bleed valve open and Engine 2 BLEED Air Switch ON w/ isolation valve open

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10
Q

What caution must be observed with the DUAL BLEED Light illuminated?

A

Do not advance thrust above IDLE

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11
Q

What is indicated by a WING-BODY OVERHEAT Light?

A

High temperature due to bleed air duct leak in the respective
• Engine strut
• Inboard wing leading edge
• Air conditioning bay
• Keel beam or APU bleed air duct (left light only)

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12
Q

With the ISOLATION VALVE Switch in AUTO, when does the valve open?

A

When any PACK or Engine BLEED Switch is placed in OFF

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13
Q

The engine and APU bleed valves are __________ activated and __________ operated.

A

DC, pressure

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14
Q

When using ground conditioned air, may the packs be operated?

A

No — packs can be damaged if operated with conditioned air

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15
Q

What is the TRIP RESET Switch used to reset?

A
  • BLEED TRIP OFF Light
  • PACK Light
  • ZONE TEMP Light
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16
Q

What is indicated by a BLEED TRIP OFF Light?

A

Excessive bleed air temp or pressure

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17
Q

How is a BLEED TRIP OFF Light reset?

A

Turn off Wing Anti-Ice, push TRIP RESET Switch

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18
Q

What is indicated by a PACK Light?

A

• Pack Discharge Temp (PDT) excessive
• Compressor Discharge Temp (CDT) excessive
• Turbine Inlet Temp (TIT) excessive
• Failure of primary and standby pack controls
(In M/C Recall, failure of primary or standby pack controls)

19
Q

How is a PACK Light reset?

A

Select a warmer temperature, push TRIP RESET Switch

20
Q

What is indicated by a CONT CAB ZONE TEMP Light?

A

Duct overheat, or failure of the cockpit primary and standby temp control (In M/C Recall, failure of cockpit primary or standby temp control)

21
Q

What is indicated by a FWD or AFT CAB ZONE TEMP Light?

A

Duct overheat

In M/C Recall, failure of associated zone temp control

22
Q

How is a ZONE TEMP Light reset?

A

Select a cooler temperature, push TRIP RESET Switch

23
Q

What is the selectable temperature range?

A

65°F – 85°F

24
Q

How is temperature normally controlled, with all zone temperature controls operational (whether in single or dual pack configuration)?

A

Pack(s) produce an air temperature that satisfies the zone requiring the coldest air. The other two zones receive the necessary amount of trim air to maintain the desired temperature for that zone.

25
Q

What happens if cockpit trim air is lost?

A

Packs are controlled independently in “unbalanced” mode
• Left pack directly controlled by CONT CAB Temperature Selector
• Right pack satisfies cabin zone requiring coolest air, with other zone using trim air

26
Q

What happens if forward or aft cabin zone trim air (or all trim air) is lost?

A

Packs are controlled independently in “averaged” mode
• Left pack directly controlled by CONT CAB Temperature Selector
• Right pack supplies averaged temperature for the two cabin zones

27
Q

What happens if an individual zone is selected OFF?

A

Its Temperature Selector setting is ignored by the temperature control system

28
Q

What happens if the TRIM AIR switch is OFF during single pack operation?

A

The operating pack supplies averaged temperature for all three zones

29
Q

What happens if all Temperature Selectors are positioned OFF?

A
  • Left pack controlled to a fixed temp of 75°F

* Right pack controlled to a fixed temp of 65°F

30
Q

On the ground (with L + R RECIRC FAN Switches in AUTO), when will the recirc fans operate?

A
  • Right fan will always operate

* Left fan will operate unless both packs selected to HIGH

31
Q

In flight (with L + R RECIRC FAN Switches in AUTO), when will the recirc fans operate?

A
  • Right fan will operate if both packs operating, unless both packs selected to HIGH
  • Left fan will operate if both packs operating, unless either pack selected to HIGH
32
Q

When are the ram doors fully open?

A

On the ground, or during slow flight with flaps extended. During cruise, they modulate open/closed as necessary to provide cooling air for the heat exchangers.

33
Q

When are the ram air deflector doors extended?

A

On the ground. They prevent FOD or slush ingestion during taxi, takeoff, and landing.

34
Q

When is the overboard exhaust valve normally open?

A

When cabin differential pressure is below 2.5 psi

35
Q

How may the overboard exhaust valve (usually closed with greater than 2.5 psi) be driven open to allow for increased ventilation for smoke removal?

A

Select R RECIRC FAN Switch to OFF and either PACK Switch to HIGH

36
Q

How many fans are provided for E/E cooling?

A

4 — normal + alternate supply fans, and normal + alternate exhaust fans

37
Q

What happens if an E/E cooling fan fails?

A

Related Equipment Cooling OFF Light illuminates. If overtemp occurs on the ground, the crew call horn in the nose wheel well sounds.

38
Q

What happens to E/E exhaust air in flight with the overboard exhaust valve closed?

A

It is mixed with air from the passenger cabin and drawn around the forward cargo compartment lining for additional cargo heating, then filtered and recirculated to the mix manifold.

39
Q

What happens to E/E exhaust air with the overboard exhaust valve open?

A

It is dumped directly overboard through the overboard exhaust valve. Forward cargo compartment receives additional cooling from air drawn down from the passenger cabin by the recirc fans. The air is then filtered and recirculated to the mix manifold.

40
Q

What are the pressurization differential limits?

A
  • 8.35 psi maximum for normal operations
  • 8.75 psi illuminates the AUTO FAIL Light
  • 9.1 psi pressure relief valves open
41
Q

What conditions cause the pressurization AUTO FAIL Light to illuminate?

A
  • DC power loss
  • Controller fault (ALTN Light also illuminates if a single controller fails)
  • Outflow valve control fault
  • Excessive cabin rate of change (± 2000 fpm)
  • Excessive cabin altitude (> 15,800’)
  • Excessive cabin differential pressure (> 8.75 psi)
42
Q

What is indicated by illumination of the ALTN and AUTO FAIL Lights?

A

A single controller has failed and automatic transfer to alternate mode has occurred

43
Q

What are some indications of excessive cabin altitude?

A
  • 10,000’ cabin alt Intermittent cabin altitude warning horn sounds, and CABIN ALTITUDE Lights illuminate
  • 14,000’ cabin alt Passenger oxygen masks drop, and PASS OXY ON Light illuminates
  • 15,800’ cabin alt AUTO FAIL Light illuminates
44
Q

What is indicated by the OFF SCHED DESCENT Light?

A

Aircraft descended before reaching planned cruise altitude set in FLT ALT window

737 Systems (12 decks)

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