Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

748 > Air Conditioning & Pressurization > Flashcards

Air Conditioning & Pressurization Flashcards

1
Q

Can flight deck fan operate in flight?

A

Fan disabled in Flight.

FCOM 1 21.10.2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How is the flight deck temperature adjusted with flight deck temperature selector in MAN?

A
  • Spring loaded to 6 o’clock position.
  • C (cool): valve moves towards closed to supply cooler air.
  • W (warm): valve moves towards open to supply warmer air.

FCOM 1 21.10.2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

How does the alternate vent operate?

A

With aircraft depressurised, opens Alt Vent Valve.

  • Outside air supplied to flight deck.
  • When switch is pushed on, valve moves to open position.
  • 29 seconds after switch is pushed on, valve can be repositioned with the Alt Vent Selector.

FCOM 1 21.10.4

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Which zones are temperature range limited to 18-29?

A

Flight Deck, Upper Deck, Crew Rest.

FCOM 1 21.10.2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the function of the PACK RESET switch?

A
  • Resets pack fault detection system.
  • Restarts Packs after automatic shutdown if fault no longer exists.
  • Reopens master trim air valves if duct overheat no longer exists.

FCOM 1 21.10.8

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the purpose of and how many IASC are installed?

A

Controls pack output temperature to ensure minimum temperature for flight deck and some bleed air function (only 2)

FCOM 1 21.20.1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Describe the Air conditioning pack flow rates regulations.

A

3 flow rates: economy (0.06%), Normal (0.3%) and high.

FCOM 1 21.20.1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

When will pack output automatically operate in ECONOMY MODE?

A

In cruise flight at or above FL250, the configuration for economy flow is:

  • All packs operating, and
  • The high pack flow switch OFF, and
  • Both forward and Aft main deck temperature selector is OFF, and both forward and aft lower lobe temperature selectors in OFF

FCOM 1 21.20.1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How can all packs be configured to high flow in cruise?

A

Push “Pack high flow” switch ON

FCOM 1 21.20.2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the indications when a pack is operating in a “Standby cooling mode”?

A

EICAS advisory message “PACK MODE” displayed.

  • Pack cooling capacity may be less than normal.
  • Warmer flight deck and cabin temperatures may occur at lower altitudes.

FCOM 21.20.3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Describe purpose of the Recirculation and the Zones excluded.

A

Assists the packs to maintain a constant ventilation rate to the main deck and lower lobe cargo zones. The fans draw cabin air through filters, then reintroduce air into the conditioned air distribution system.

FCOM 1 21.20.3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Describe the packs airflow distribution

A

Flight Deck-Packs 1 & 3
Main Deck-All Packs
Forward Lower Lobe-Pack 3
Aft Lower Lobe-Pack 2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How does aircond packs determine the lowest pack output temperature?

A

Lowest temperature on selector for Cargo

FCOM 1 21.20.6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How many degrees can the supernumerary modify the Crew Rest Area Zone temperatures?

A

+/- 6 degrees C from 18-29 degrees.

FCOM 1 21.20.7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is “BACKUP MODE” in air conditioning system?

A

If a system fault or overheat occurs in a temperature zone, the respective master trim air valve closes and a backup mode controls cabin temperature.

FCOM 1 21.20.7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How does the lack temperature respond when trim air is not available?

A

Loss of LH Trim air: Pack supplies the average temp of the flight deck and upper deck zones set by the flight deck temperature selector.

Loss of RH Trim air: Backup Mode (Regulated to maintain lowest temperature set by the respective temperature selector in the cargo zones, but not lower than the target temperature set for flight deck)

FCOM 1 21.20.7

17
Q

How can zone temperature control be reset after an overheat condition?

A

Pushing pack reset switch.

FCOM 1 21.20.7

18
Q

Describe the purpose of the trim air isolation valve.

A

Allows either left or right trim air to be supplied to all temperature zones. (Normally closed).

FCOM 21.20.6

19
Q

Where does the equipment cooling air discharge to?

A

Forward Cargo Compartment

FCOM 21.20.9

20
Q

How is the lower aft cargo compartment heated?

A

Bleed air from the Centre section of the bleed air duct. A thermal switch in the compartment opens and closed the lower lobe aft cargo heat temperature control valve. (Cool Open, Warm Close)

FCOM 1 21.20.6

21
Q

When is Aft lower lobe cargo heating available?

A

Aft lower lobe temperature selector must be in OFF.

Low (4 degrees) High (10 degrees)

FCOM 1 21.20.7

22
Q

When will the system configure to closed loop operation?

A
  • Forward lower lobe temperature set to below 10 degrees.
  • Single infernal Fan fail.
  • In closes loop mode, onboard exhaust valve is closed.

FCOM 1 21.20.9

23
Q

When does the equipment cooling system configure for flight?

A

One or more engine on each wing operating.

FCOM 1 21.20.9

24
Q

In flight, what happens to the equipment cooling system when the forward lower lobe temperature selection is set below 10 degrees?

A

Onboard exhaust valve closed and air recirculated in a closed loop.

FCOM 1 21.20.9

25
Q

How can the equipment cooling system be manually configured for flight?

A

Positioning Equipment cooling selector to STBY.

FCOM 1 21.20.9

26
Q

Which valve opens when Equipment cooling OVRD is selected?

A

Smoke/over ride valves open.

FCOM 1 21.20.9

27
Q

What regulates the overboard discharge of conditioned cabin air and why?

A

Cabin pressurisation through outflow valves.

FCOM 1 21.30.1

28
Q

How many outflow valves are required for full automatic operation?

A

One. Two valves are installed and either are capable of maintaining full automatic operation.

FCOM 1 21.30.1

29
Q

What condition will cause pack #2 to shut down?

A

When pressure relief valve is Open.

FCOM 1 21.30.2

30
Q

When will the cabin altitude controllers assume aircraft cruise altitude of 39,000 feet?

A

When cruise altitude is unavailable from the FMC in AUTO

FCOM 1 21.30.1

31
Q

What is the highest cabin altitude in cruise with cabin altitude control in AUTO?

A

8000 Feet

FCOM 1 21.30.1

32
Q

What type of cabin relief valves are located at the cargo doors?

A

6 negative pressure relief valves.

FCOM 1 21.30.2

33
Q

During descent, why does the cabin altitude decrease to slightly below the FMC landing altitude?

A

Assured small positive pressurisation at touchdown

FCOM 1 21.30.2

748 (18 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions