AIR CONDITIONING

Question 1

What is the flight deck temperature range with the Flight Deck (FLT) temperature Selector in AUTO?

Answer 1

• 65F to 85F (18C to 29C)

Note:FCOM, VOL 2; 2.10.3

Question 2

What valve are you controlling when you select MAN with the flight deck temperature controller?

Answer 2

• Flight deck trim air valve

Note:FCOM, VOL 2; 2.10.13

Question 3

What does the Zone System (SYS) Fault Light indicate?

Answer 3

• Temperature zone duct overheat or zone temperature controller fault has
occurred.
• Master trim air valve failed closed
• Trim air switch off
• Master trim air valve closed and pack air continues to flow.

Note:FCOM, VOL 2; 2.10.3

Question 4

What is the temperature range with the main deck and forward and aft lobe temperature selectors in AUTO?

Answer 4

• 40F to 85F (4C to 29C)

Note:FCOM, VOL 2; 2.10.14 and 2.10.15

Question 5

Under what conditions would trim air be unavailable to the flight deck, upper deck, crew rest, and main deck?

Answer 5

• EICAS advisory TEMP ZONE is displayed.
• Center section of the bleed duct is isolated.
• EICAS Advisory message TRIM AIR OFF is displayed.
• The Master Trim Air switch is OFF.

Note:FCOM, VOL 2; 2.20.6

Question 6

If trim air is not available to the flight deck, upper deck, crew rest, and Main deck distribution system, how is temperature controlled in the cabin?

Answer 6

• Backup modes control temperature
• If the flight deck temp selector setting is available to the PTC, pack outlet
temperature of all packs is regulated to an average temp between 65F
and 85F, as set by the Flt Deck Temp selector, or
• If unavailable to the PTC, the last temperature set, or
• If last temp unavailable to the PTC, then 75F (24C)

Note:FCOM, VOL 2; 2.20.13

Question 7

What target temperature is set to the upper deck and crew rest zone when electrical power is initially applied to the airplane?

Answer 7

• 75F (24C)

Note:FCOM, VOL 2; 2.20.12

Question 8

How many pack temperature controllers (PTC) are provided?

Answer 8

• Two – A and B

Note:FCOM, VOL 2; 2.20.2

Question 9

How many separate channels are provided in the PTCs?

Answer 9

• Each PTC has three separate channels, one for each pack.

Note:FCOM, VOL 2; 2.20.2

Question 10

What happens if a pack temperature controller (PTC) detects a fault in a pack channel?

Answer 10

• Control of the respective pack switches to the other PTC.

Note:FCOM, VOL 2; 2.20.2

Question 11

How can you restore pack operation for a failed PTC?

Answer 11

• Push the Pack Reset Switch.

Note:FCOM, VOL 2; 2.20.3

Question 12

What would happen if a fault or an overheat of the PTC is detected?

Answer 12

• The respective pack valve closes, resulting in a pack shutdown.

Note:FCOM, VOL 2; 2.20.3

Question 13

What are the 7 temperature zones for the 400F?

Answer 13

• Flight deck/upper deck/crew rest
• Forward and aft main deck
• Forward and aft lower lobe cargo zones

Note:FCOM, VOL 2; 2.20.2

Question 14

What is the function of the Lower Lobe Cargo Conditioned AIR FLOW RATE Selector? (LLCCAFR)

Answer 14

• Provides forward and aft lobe cargo air conditioning.

Note:FCOM, VOL 2; 2.10.21

Question 15

With the LLCCAFR Switch Off, what controls pack outlet temperature?

Answer 15

• The flight deck, upper deck, and crew rest zone requiring the coolest temperature.

Note:FCOM, VOL 2; 2.20.11

Question 16

What zone and what pack is affected with the LLCCAFR selector in FWD HI?

Answer 16

• All of pack three air is sent to the forward lower cargo lobe.

Note:FCOM, VOL 2; 2.20.7

Question 17

What zone and what pack is affected with the LLCCAFR selector in AFT HI?

Answer 17

• All of pack two air is sent to the aft lower cargo lobe.

Note:FCOM, VOL 2; 2.20.7

Question 18

Explain the position of the LLCCAFR selector in BOTH LOW.

Answer 18

• 2/3 of pack 3 and 2/3 of pack 2 conditioned air distributed respectively to
forward and aft lower lobe cargo compartments.

Note:FCOM, VOL 2; 2.10.21