Air Conditioning - Question Bank

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)

Question 2

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

Answer 2

Flight deck trim air valve

Question 3

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

Answer 3

• Temperature zone duct overheat
• 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

Question 4

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

Answer 4

40F - 85F (4C - 29C)

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” displayed
• Center section of the bleed duct is isolated
• EICAS advisory message “TRIM AIR OFF” is displayed
• The Master Trim Air switch is “OFF”

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
• If unavailable to the PTC- the last temp set
• If last temp unavailable to the PTC, then to 75F (24C)

Question 7

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

Answer 7

75F (24C)

Question 8

How many pack temperature controllers (PTC) are provided?

Answer 8

Two - A & B

Question 9

How many separate channels are provided in the PTCs?

Answer 9

Each PTC has 3 separate channels- one for each pack

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

Question 11

How can you restore pack operation for a failed PTC?

Answer 11

Push the Pack Reset Switch

Question 12

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

Answer 12

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

Question 13

What are the 7 temperature zones for the 400F?

Answer 13

• Flight deck
• Upper deck
• Crew Rest
• FWD Main Deck
• AFT Main Deck
• FWD Lower Lobe
• AFT Lower Lobe

Question 14

What is the function of the Lower Lobe Cargo Conditioning AIR FLOW RATE selector? (LLCCAFR)

Answer 14

Provides FWD and AFT lobe cargo air conditioning.

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 temp

Question 16

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

Answer 16

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

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

Question 18

Explain the position of the LLCCAFR selector in BOTH LOW.

Answer 18

2/3 of pack 3 & 2/3 of pack 2 conditioned air distributed respectively to FWD and AFT lower lobe cargo compartments