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Boeing 757/767 > Air Systems > Flashcards

Air Systems Flashcards

1
Q

Compartment Temp INOP light

A
  • fault in zone temp controller
  • compartment temp control OFF
  • TRIM AIR switch OFF
  • Zone overheat
  • FWD and AFT INOP with Cargo Fire switch
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2
Q

Compartment Temp range

A

65°F (18°C) and 85°F (30°C)

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3
Q

Equipment Cooling SMOKE light

A
  • Smoke is detected in the flight deck equipment cooling ducts
  • System is automatically configured to evacuate smoke
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4
Q

CABIN ALTITUDE light and EICAS

A
  • Cabin altitude exceeds 10,000 feet; or
    14,650’ with High Altitude Landing selected (RR)
  • Illuminates the crew lavatory Cabin Depressurization Warning Light

-extinguishes when cabin alt is below 8500 feet

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5
Q

ENGINE HIGH STAGE light (757)

A

• Engine bleed system pressure is excessive
• Engine high pressure bleed air valve is automatically locked closed
- can only be unlocked on the ground by MX

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6
Q

How many temp zones

A

3 temperature zones: the flight deck and two cabin zones

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7
Q

What determines Pack output temp when pack controller in STBY mode?

A

Position of pack selector:

  • N (normal) - Constant, moderate temperature (40°F inflight)
  • W (warm) - Full warm
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8
Q

How is air distributed through the cabin and flight deck?

A
  • Conditioned air from the packs flows into a mix manifold where it mixes with air from the recirculation fan ——> to cabin
  • left and right pack output is joined prior to the mix manifold and provides 100% fresh conditioned air ——> flight deck
  • recirculation fan draws air through the forward E/E system and returns it to the mix manifold
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9
Q

How is temp controlled with loss of trim air system?

A
  • the packs attempt to maintain all compartments at an average temperature (75°F)
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10
Q

How are FWD equipment racks cooled?

A
  • supply fans that draws cooling air from the cabin and forces it through the equipment racks and avionics
  • differential pressure is low, the overboard exhaust valve automatically opens
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11
Q

Equipment OVHT light illuminates

A
  • insufficient cooling airflow
  • Overboard exhaust valve does not open when the recirculation fan fails
  • Forward Equipment SMOKE light remains illuminated longer than five minutes
  • Both aft equipment cooling exhaust fans are inoperative
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12
Q

Smoke detected in equipment cooling system

A
  • SMOKE illuminates
  • Operating supply fan is turned off
  • Recirculation fan turns off
  • One or both air conditioning packs switch to high flow
  • Overboard exhaust valve opens
  • OVHT light is inhibited for five minutes
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13
Q

How is Aft equipment cooled?

A
  • continuously operating exhaust fans (2) that draws air through the equipment and exhausts it near the outflow valve
  • one fan operated and the other in standby
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14
Q

Automatic Pressurizations modes

A

In AUTO 1 or AUTO 2:
- systems arms when doors closed and T/O thrust set

Takeoff Mode:

  • pressurized to slightly below airport elevation
  • outflow valve partially open
  • outflow valve closes slightly on takeoff

Climb Mode:
- Max diff pres 8.6 psi at 35,000’

Cruise Mode:
- entered when constant altitude for 1 min

Descent Mode
- when aircraft descents more than 1000’

Landing and Ground Test mode:

  • cabin altitude descents to slightly below field elevation (approx 100’ below)
  • self test begins after landing
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15
Q

CABIN AUTO INOP

A
  • AUTO 1 and AUTO 2 inoperative, or

- Cabin Altitude selector in MAN

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16
Q

What causes outflow valves to automatically close?

A
  • aneroid switches automatically close outflow valves if cabin altitude exceed 11,000’
  • normal operation of outflow valves restored when cabin altitude descends below 9,500’
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17
Q

What happens to the packs and cabin air distribution when Cargo Fire switch is set to DEPR

A
  • one pack to low flow
  • one pack shutoff
  • conditioned air to cabin is shut off
  • all conditioned air diverted to flight deck
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18
Q

What is bleed air used for?

A
  • Air conditioning
  • Pressurization
  • Engine start
  • Wing and engine anti-ice
  • Hydraulic reservoir pressurization
  • Cargo heat (767)
  • Center hydraulic system Air Demand Pump (767)
  • Engine thrust reversers (767)
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19
Q

Sources of engine bleed air

A

Low Pressure (LP) compressor - used during high power settings

High Pressure (HP) compressor - used during descent and low power settings

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20
Q

L or R ENG HI STAGE EICAS message (757)

A
  • engine bleed air pressure excessive
  • high pressure bleed air valve automatically locks close
  • maintenance action required to unlock
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21
Q

What altitude can APU bleed air be used up to?

A

17,000’

22
Q

What happens to the APU Bleed Valve after engine start?

A

APU Bleed valve will automatically close depending on the relative position of the engine bleed valves and the isolation valve.

23
Q

How many external ground pneumatic connections

A

Two - 1 on the left duct and 1 on the right duct (757)

- both on left duct (767)

24
Q

BLEED ISLN VAL EICAS message

A

isolation valve position disagrees with the commanded position

25
Q

L or R BLD DUCT LEAK

A
  • high temperature bleed air leak is detected

- disappears when temperature along the duct has cooled

26
Q

L or R ENGINE BLEED VAL/OVHT

A
  • engine bleed air temperature is excessive
  • Engine bleed air valve close (PRSOV)
  • HP bleed valve automatically close (757)
  • HPSOV, PRV are closed (767)
  • system can be reset by selecting switch OFF then ON
27
Q

When is pack high flow inhibited (767)

A
  • Wing anti-ice on and only one bleed source available
  • Flaps are not in the UP position
  • An engine is shutdown
  • Cargo Fire switch to DEPR
28
Q

Equipment Cooling OVRD (767)

A
  • Opens smoke override valve and positions equipment cooling system for reverse airflow
  • Shuts down nitrogen generation system (as installed)

Automatically selected:
− Jettisoning fuel during single-engine operations – or –
− When Cargo Fire switch is pushed

29
Q

FWD E/E config on the ground, packs OFF, temp below 45ºF

A
  • closed loop
  • supply fan ON
  • exhaust fan ON
  • OVBD (smoke and exhaust) valve CLOSED
30
Q

FWD E/E config on the ground, packs OFF, temp above 45ºF

A
  • open loop
  • supply fan ON
  • exhaust fan ON
  • OVBD Exhaust valve Open
  • SMOKE OVBD valve Closed
  • BYPASS shutoff valve Closed
31
Q

FWD E/E config on the ground, engine ON

A
  • closed loop
  • Supply and Exhaust Fans ON
  • OVBD valves CLOSED
32
Q

How is Cargo Heat normally supplied (767)

A
  • FWD and AFT by bleed air system

- automatically maintains temp above 45ºF (7ºC)

33
Q

Systems supplies by center pneumatic duct (767)

A
  • Center hydraulic reservoir
  • Aft cargo heat
  • Center hydraulic system ADP
  • Smoke detectors
34
Q

Systems supplied by left pneumatic duct (767)

A
  • respective thrust reverser
  • respective nacelle anti-ice
  • respective hydraulic reservoir
  • respective pack
  • respective wing anti-ice
35
Q

Systems supplied by right pneumatic duct (767)

A
  • respective thrust reverser
  • respective nacelle anti-ice
  • respective hydraulic reservoir
  • respective pack
  • respective wing anti-ice
  • FWD cargo heat
36
Q

What happens if BODY DUCK LEAK or R/L BLD DUCK LEAK EICAS messages remain illuminated after the bleed source is turned off (767)

A

leak exists between the left and right isolation valves in the common manifold

37
Q

What happens if a L or R BLD OVHT/OVHT light occurs? (767)

A
  • respective engine bleed valve automatically closes
  • HPSOV and PRV close
  • PRV will open if engine anti-ice is activated
  • Thrust Reverse not avail
38
Q

How many Pos/Neg Pressure Relief valves

A

757:
2 x Pos PRV aft of left wing
2 x Neg PRV right of FWD cargo door 1

767:
2 x Pos PRV FWD of left LE
4 x Neg PRV (2 on AFT cargo door, 2 on FWD cargo door)

39
Q

Auto Rate selector

A
  • sets limit of cabin altitude rate of climb or descent

- index mark is normal position (500 fpm climb, 300 fpm descent)

40
Q

How is outflow valve controlled?

A
  • actuator geared to 3 motors (only one operative at a time)
  • 2 AC motors (APC 1 and APC 2)
  • 1 DC motor (manual
41
Q

How many Ext air connections?

A

PW:
- 2 (one to left duct and one to right duct)

RR:
- 3 (2 to left duct and one to right duct)

GE:
- 2 (both to left duct)

42
Q

APU Bleed valve logic in flight

A

APU ON and APU bleed switch ON

APU Bleed Valve opens if:

  • Left Bleed and ISO valve closed, or
  • Both Eng Bleed Valves closed and ISO valve open
  • APU air shuts off at 23,000’
  • APU air restored at 20,000’
43
Q

APU VALVE light/APU BLEED VAL EICAS

A

Disagreement with valve position

44
Q

When does the HPSOV open or close

A
  • Opens: To ensure sufficient air pressure to system at lower thrust settings
  • Closes: As thrust increases and Low Pressure (LP) check valve provides enough air to system
45
Q

How many ground air connections required for start?

A
  • (B767) Two connections are required
    − (B757) Two connections are recommended
    − (RR) Three connections may be required in extremely cold weather
46
Q

DUCK LEAK discrete light

A

− Bleed air leak in:
♦ Wing – or –
♦ Body – or –
♦ Engine strut

47
Q

L or R Pack Temp Advisory

A

Pack controller fault – or –
♦ Temperature valve freezes in position – and –
♦ Pack cannot be reset – and –
♦ Pack must be operated in STBY
Pack overheat
♦ Temperature valve driven full cold, if due to outlet over-temperature – and –
♦ Pack can be reset after cooling

48
Q

What determines the configuration of Equipment Cooling

A

• On ground, system configuration determined by:

  • Engine operation – and –
  • Pack operation – and –
  • Aircraft skin temperature – and –
  • Ambient temperature

• In flight:

  • Only one fan operates at a time – and –
  • Air is constantly recirculated
49
Q

Normal Cabin Differential Pressure

A

8.6 PSI

50
Q

When is Pack High Flow inhibited (767)

A
  • Wing anti-ice on and only one bleed source available
  • Flaps are not in the UP position
  • An engine is shutdown
  • Cargo Fire switch to DEPR

Boeing 757/767 (19 decks)

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