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SCA > DB's SY 737 Air Systems > Flashcards

DB's SY 737 Air Systems Flashcards

0
Q

ISOLATION VALVE switch:

  1. CLOSE
  2. AUTO
  3. OPEN
A
  1. Closes isolation valve
  2. A. Closes isolation valve if both engine BLEED air switches are ON and both air conditioning PACK switches are AUTO or HIGH
    B. Opens isolation valve automatically if either engine BLEED air or air conditioning PACK switches are positioned OFF
  3. Opens isolation valve
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1
Q

DUAL BLEED light illuminated

A
  1. APU bleed air valve open and engine 1 BLEED switch ON

2. Engine 2 BLEED air switch ON, APU bleed air valve and isolation valve open.

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2
Q

WING-BODY OVERHEAT light illuminated

  1. left light
  2. Right light
A
  1. Overheat from bleed air duct in
    a. left engine strut
    b. left inboard wing leading edge
    c. left air conditioning bay
    d. keel beam or
    e. APU bleed air duct
  2. Overheat from bleed air duct in
    a. right engine strut
    b. right inboard wing leading edge or
    c. right air conditioning bay.
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3
Q

Engine BLEED Air switches

  1. OFF
  2. ON
A
  1. Closes engine bleed air valve

2. Opens engine bleed air valve when engines are operating

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4
Q

APU BLEED Air Switch

  1. OFF
  2. ON
A
  1. Closes APU bleed air valve

2. Opens APU bleed air valve when APU is operating

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5
Q

Wing-Body Overheat TEST switch - push

A
  1. Tests wing-body overheat detector circuits

2. Illuminates both WING-BODY OVERHEAT lights

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6
Q

BLEED TRIP OFF Light - illuminated (Amber)

A

Excessive engine bleed air temp or pressure
• related engine bleed air valve closes automatically
• requires reset

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7
Q

TRIP RESET Switch- Push (if fault condition is corrected)

A
  1. Resets BLEED TRIP OFF, PACK and ZONE TEMP lights
  2. Related engine bleed valve, PACK valve, or trim air modulating valve opens
  3. Lights remain illuminated until reset
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8
Q

CONT CAB ZONE TEMP light

  1. illuminated
  2. During master recall
A
  1. Duct temp overheat or failure of the flight deck primary and standby temp controller
  2. Failure of the flight deck primary or standby temp controller
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9
Q

FWD CAB or AFT CAB ZONE TEMP light

  1. illuminated
  2. During master recall
A
  1. Duct temp overheat

2. Failure of associated zone temp control

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10
Q

Temperature Selector

  1. Auto
  2. OFF
A
  1. Provides automatic temp control for associated zones ranging from 65°F (C) to 85°F (W)
  2. Closes the associated trim air modulating position
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11
Q

RAM DOOR FULL OPEN light

  1. Illuminated
  2. When would it normally be illuminated?
A
  1. Ram door in full open position

2. On the ground or during slow flight with the flaps not fully retracted

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12
Q

Air Conditioning PACK Switch - OFF

A

PACK signaled OFF

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13
Q

Air Conditioning PACK Switch - AUTO

A

PACKs regulate to low or high flow, depending on conditions.

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14
Q

When do PACKs operate in low flow mode?

A

With PACK Switches in AUTO and both PACKs are operating.

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15
Q

When do PACKs operate in high flow mode automatically?

A

Both air conditioning PACK Switches AUTO and

  1. One PACK not operating
  2. Inflight
  3. Flaps up
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16
Q

When do PACKs operate in high flow mode manually?

A
  1. When operating at least one PACK from APU and both engine BLEED air switches OFF, either Inflight or on the ground
  2. When either PACK switch is positioned to HIGH
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17
Q

Air Conditioning PACK Switch - HIGH

A
  1. Regulates to high flow

2. Provides maximum flow rate on ground with APU BLEED air switch ON

18
Q

PACK light - Illuminated (amber)

  1. During recall
  2. On its own
A
  1. Failure of either primary or standby PACK control

2. Indicates PACK trip off (due to excessive heat) or failure of both primary and standby PACK controls

19
Q

TRIM AIR Switch

  1. ON
  2. OFF
A
  1. Trim air pressure regulating and SOV signaled open

2. Trim air pressure regulating and SOV signaled closed

20
Q

RECIRC FAN Switches - OFF

A

Fan signaled off

21
Q

RECIRC FAN Switches - AUTO
In-flight
1. Left RECIRC fan
2. Right RECIRC fan

A
  1. Operates if both PACKs are operating unless either PACK switch is in HIGH
  2. Operates if both PACKs are operating unless both PACK Switches are in HIGH
22
Q

RECIRC FAN Switches - AUTO - on the ground

  1. Left RECIRC fan
  2. Right RECIRC fan
A
  1. Operates unless both PACK switch is in HIGH

2. Operates even if both PACK Switches are in HIGH

23
Q

AUTO FAIL light - Illuminated (amber)

A
  1. Single controller failure (with ALTN light on)
  2. Dual controller failure (with ALTN light off)
  3. Loss of DC power
  4. Outflow valve control fault
  5. Excessive differential pressure (>8.75 PSI)
  6. Excessive rate of cabin pressure change (+/- 2000 ft/min)
  7. High cabin altitude (> 15,800ft)
24
Q

OFF SCHED DESCENT light - illuminated (Amber)

A

Airplane descended before reaching the planned cruise altitude set in the FLT ALT indicator

25
Q

FLT ALT or LAND ALT Indicator displays “88888” or all dashes?

A

A panel failure was detected after a DC power interruption

26
Q

MANUAL light - illuminated (green)

A

Pressurization system operating in manual mode

27
Q

ALTN light - illuminated (green)

  1. With AUTO FAIL light
  2. Without AUTO FAIL light
A

Pressurization system operating in alternate automatic mode:

  1. Indicates a single controller failure and automatic transfer to ALTN mode
  2. Pressurization mode selector in ALTN position
28
Q

In which pressurization modes (auto, alternate, or manual) will the outflow valve operate?

A

All modes

29
Q

Pressurization Mode Selector - AUTO

A

Pressurization system controlled automatically

30
Q

Pressurization Mode Selector - ALTN

A

Pressurization system controlled automatically using ALTN controller

31
Q

Pressurization Mode Selector - MAN

A

Pressurization system controlled manually by outflow valve switch (both auto controllers bypassed)

32
Q

What is the Cabin/Flight Altitude placard used for?

A

Determining the setting for cabin altitude when operating in manual mode

33
Q

What systems rely on the bleed air system for operation?

A
  1. Air conditioning/pressurization
  2. Wing and engine thermal anti-icing
  3. Engine starting
  4. Hydraulic reservoir pressurization
  5. Water tank pressurization (817SY and 818SY)
  6. Aspirated TAT
34
Q

Where is engine bleed air obtained from?

A

The 5th and 9th stages of the compressor

35
Q

The L and R duct pressure indicates a 30 PSI split, but everything else remains normal. Is this a write up?

A

No. Indications are considered normal as long as there is sufficient air for cabin pressurization.

36
Q

When and why do the deflector doors of the ram air inlet extend?

A

When on the ground to prevent slush ingestion.

37
Q

If a passenger cabin zone trim air, or all trim air is lost, what temperature will be produced by;

  1. The left PACK
  2. The right PACK
A
  1. Whatever is selected by the CONT Cabin temp controller

2. The average of the forward and aft zone temp demands

38
Q

If all zone controls are positioned to OFF, what is this called and what temp will each PACK produce?

A

Fixed Cabin Temperature produces 75° from the left PACK and 65° from the right PACK.

39
Q

Where does the forward cargo compartment receive its warm air supply from when;

  1. Outboard exhaust is open (normally on ground)
  2. Outboard exhaust is closed (normally in flight)
A
  1. The passenger cabin exhaust

2. Electric equipment cooling exhaust

40
Q

At what PSI does the positive pressure relief valves provide safety pressure relief?

A

They open at 8.95 PSI limiting the differential pressure to a max of 9.1 PSI.

41
Q

When would you expect the overboard exhaust valve (located just after of the E&E compartment) to open?

A
  1. On the ground
  2. In flight with low differential pressure
  3. For smoke removal (either PACK switch OFF and right RECIRC OFF)
42
Q

How is the take off airport altitude set on pressurization auto controllers?

A

Automatically using cabin altitude when on the ground.

SCA (15 decks)

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