Air Con

Question 1

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

Answer 1

18-29 deg c


Question 2

What valve is controlled when MAN is selected with the flight deck temperature controller?

Answer 2

flight deck trim air control valve


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

Question 4

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

Answer 4

4-29 deg c

Question 5

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

Answer 5

center duct isolation (e.g leak)

Question 6

If trim 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 temperature control mode

if FD temp selector setting available to PTC, pack outlet temp of all packs regulated to achieve 18-29

- if unavailable, outlet temp regulated to achieve last FD temp set

- if unavailable - regulated to achieve 24
temp to CR,UD,MD not regulated

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

24 deg c

Question 8

How many pack temperature controllers (PTC) are provided?

Answer 8

2 - A and B

Question 9

How many separate channels are provided in the PTCs?

Answer 9

3 channels (one per pack)

Question 10

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

Answer 10

automatically switches to other PTC

Question 11

How can you restore pack operation for a failed PTC?

Answer 11

should auto select other PTC, otherwise can manually (when trim air switch on)
attempt to restore pack operation with pack reset switch


Question 12

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

Answer 12

respective pack valve closes resulting in pack shut down - switch to other PTC (auto or manual)

Question 13

What are the 7 temperature zones of the 400f?

Answer 13

FD, UD, CR, MD - FWD and AFT, LLCZ - FWD and AFT

Question 14

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

Answer 14

configure pack flow rate for lower lobe cargo zone

Question 15

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

Answer 15

lowest of zones FD, UD, CR, MD

Question 16

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


Answer 16

Fwd LLCC receives all pack 3 air

Question 17

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

Answer 17

Aft LLCC receives all pack 2 air

Question 18

Explain the position of the LLCCAFR selector in BOTH LOW.

Answer 18

2/3 of each pack (2+3) go to respective zones (aft + fwd)

1/3 of each pack (2+3) go to cabin

Question 19

What position of the LLCCAFR selector would result in all packs remaining in high flow during cruise?

Answer 19

FWD or AFT HI Or BOTH LOW

Question 20

To what systems do the center duct provide air supply?

Answer 20

aft cargo heat

trim air (all zones)

cargo smoke detection

potable water pressurization

LLC a/c trim air

Question 21

Describe overheat protection of the aft cargo heat system.

Answer 21

overheat thermal switch opens and closes an overheat/shutoff valve at higher temps

Question 22

What is the source of heat for the forward cargo compartment?

Answer 22

Heated air exhausted from E&E compartment