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Boeing 777 > 777 Air Systems > Flashcards

777 Air Systems Flashcards

1
Q

What. is the air source for the packs?

A
  1. Engines, APU, high pressure ground air.
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2
Q

How.many air conditioning pack controllers are there?

A
  1. Two.
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3
Q

Following a pack shut down, how is the pack reset?

A
  1. Push the AIR CONDITIONING RESET switch.
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4
Q

Which pack supplies 100% fresh conditioned air to the flight deck?

A
  1. The left pack.
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5
Q

Why is the conditioned air in the flight deck maintained at a higher pressure than the cabin?

A
  1. To prevent cabin smoke from entering the flight deck.
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6
Q

What is the purpose of the Recirculation Fans?

A
  1. Assists the packs to maintain a constant ventilation rate through the cabin.
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7
Q

In standby cooling mode, which messages are displayed on:

a. EICAS.
b. Air synoptic.

A
  1. a. PACK MODE (L/R) – Advisory

b. STBY COOLING (amber).

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8
Q

Under what conditions will packs operate continuously in Standby Cooling mode regardless of altitude and temperature?

A
  1. Both packs are in standby cooling, or one pack is inoperative with the other in standby cooling.
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9
Q

What determines the pack outlet temperature?

A
  1. The zone requiring the coolest temperature.
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10
Q

What is the source of Trim Air?

A
  1. Engine bleed air.
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11
Q

Over what range of temperature can the cabin crew adjust the cabin zones about the reference you set?

A
  1. Plus/minus 6 degrees (within the range of 18 to 29C).
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12
Q

Are all zones supplied with trim air?

A

Yes

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13
Q

What temperature is maintained in all zones if a trim air supply is lost?

A
  1. An average target temperature.
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14
Q
  1. Which air conditioning panel switches remain operable following a dual temperature controller failure?
A
  1. The pack switches.
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15
Q
  1. Are the shoulder and foot heaters available on the ground?
A

No

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16
Q
  1. Where are the controls for the Aft and Bulk Cargo heat?
A
  1. Overhead Maintenance Panel
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17
Q
  1. What is the source of air for the Aft and Bulk Cargo heating?
A
  1. Bleed air.
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18
Q
  1. The failure of which fans cause Aft and Bulk Cargo heat to fail?
A
  1. The lavatory/galley vent fans.
19
Q
  1. How is the temperature of the forward cargo heating controlled?
A
  1. By forward equipment ventilation air being discharged into the forward cargo compartment.
20
Q
  1. With HIGH selected for the bulk cargo heat, how is air flow increased?
A
  1. The bulk ventilation fan is turned ON.
21
Q
  1. When selected, how are Aft and Bulk Cargo compartment temperatures controlled?
A
  1. Control valves are opened and closed by temperature sensors.
22
Q
  1. What moves the air over the aft equipment?
A

Aft galley/lavatory ventilation fan.

23
Q
  1. Where is aft cooling air exhausted?
A

Through aft outflow valve.

24
Q
  1. With the equipment cooling switch at AUTO during normal operations: a. From where is the forward equipment cooling air drawn?
    b. What moves the air through the system?
    c. Where is forward equipment ventilation air exhausted?
A

a. The cabin
b. One of two supply fans.
c. Through the forward outflow valve or into the forward cargo hold for
heating.

25
Q
  1. How many supply fans are there in the forward cooling system?
A

Two, a primary and a back-up.

26
Q
  1. How is forward equipment cooling maintained in OVRD mode?
A
  1. Smoke/override valve opens and cabin pressure differential causes reverse flow of air.
27
Q
  1. How many outflow valves are there?
A
  1. Two; forward and aft.
28
Q
  1. When in the automatic pressurisation mode, list the data inputs used to calculate pressurisation schedule?
A
  1. Ambient pressure from ADIRS and flight plan data from the FMC.
29
Q
  1. At what rate will the cabin climb?
A
  1. On a schedule related to the aircraft climb rate and flight plan cruise altitude.
30
Q
  1. What will be the cabin altitude at maximum certified operating altitude?
A
  1. 8,000ft.
31
Q
  1. From where is the landing altitude barometric reference obtained?
A
  1. Captain’s altimeter setting.
32
Q
  1. What will the cabin altitude be just before touchdown?
A
  1. Cabin altitude decrease to slightly below planned landing altitude.
33
Q
  1. What happens to the outflow valves at touchdown?
A
  1. Both valves open to depressurise the cabin.
34
Q
  1. How is cabin altitude controlled for:

a. Takeoff from airports above 8000ft? b. Landing at airports above 8000ft?

A
  1. a. The cabin descends to the target altitude during climb
    b. The cabin climbs to 8000 ft and before arrival climbs to destination
    elevation
35
Q
  1. What is the indication on the EICAS display that an outflow valve is under manual control?
A

The letter M (amber) is displayed next to the Outflow Valve Position indicators.

36
Q
  1. What are the three air supply sources for bleed air?
A
  1. Engines, APU, Ground air.
37
Q
  1. Once an engine bleed switch is armed, how is the bleed valve actuated?
A
  1. By pneumatic pressure.
38
Q

How is pneumatic duct pressure maintained at:

a. low engine thrust? b. high engine thrust?

A
  1. a. High stage bleed air b. Low stage bleed air
39
Q
  1. In flight, up to what altitude is the APU bleed air available?
A
  1. 22,000 feet approx.
40
Q
  1. During normal operation what is the position of the isolation valves?
A
  1. Centre closed, Left & Right open.
41
Q
  1. What happens if a duct leak is detected?
A
  1. The system automatically isolates the leak.
42
Q
  1. Following a BLEED LEAK EICAS message and automatic isolation, which advisory message will confirm isolation?
A
  1. BLEED LOSS _____.
43
Q
  1. On which displays are pneumatic duct pressures displayed?
A
  1. At the bottom of the primary EICAS screen; air synoptic; at the top of the secondary engine display before engine start if the fire switch is not pulled.
44
Q
  1. What will cause an engine bleed valve to close and illuminate the amber OFF light in the bleed switch?
A
  1. Protective bleed shut down or duct leak; engine not running; engine fire switch pulled out; or switch selected OFF.

Boeing 777 (16 decks)

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