AIR CONDITIONING

Question 1

1. Equipment cooling is for the most part automatic. When would you have to interact with the system?

Answer 1

 When the OFF light illuminates

Question 2

2. What does the Equipment Cooling OFF light

indicate?

Answer 2

 Loss of air flow due to fan failure

Question 3

3. How many Supply fans are there? Exhaust

fans?

Answer 3

 Two,two

Question 4

4. Where is equipment exhaust air drawn from?

Answer 4

 Flight deck displays, overhead and AFT electronic panels, circuit breaker panels and E & E bay

Question 5

5. Where is equipment cooling air exhausted?

Answer 5

 Overboardexhaustvalve(whenopen)

 Outflow valve when OEV closed

Question 6

6. If a supply or exhaust fan should fail when on the ground, what indication would you get?

Answer 6

 MC Light with an Overhead annunciation and a nosewheel well horn

Question 7

7. Is a single PACK capable of supplying all of the air conditioning and pressurization requirements of the airplane?

Answer 7

 Yes

Question 8

8. What is indicated by a PACK light?

Answer 8

 Pack trip (overheat) or dual controller failure

Question 9

9. When would you get HIGH flow if both packs were in AUTO?

Answer 9

 Both engine bleeds off and APU bleed on

Question 10

10. If on downwind at 5 flaps and you had a pack to fault, would the remaining pack go to high
    flow?

Answer 10

 No, not with flaps out

Question 11

11. Is it recommended to operate two packs from a single bleed?

Answer 11

 No

Question 12

12. When would it be feasible to operate two packs from a single bleed?

Answer 12

 on the ground with the APU

Question 13

13. What sort of flow does the APU produce when

a pack is in HIGH on the ground?

Answer 13

 Max rate

Question 14

14. What isindicated by a CONT CAB zone temp

light?

Answer 14

 Duct temp overheat or dual controller failure

Question 15

15. What is indicated by a FWD CAB zone temp light?

Answer 15

 Duct temp overheat

Question 16

16. What is indicated by a AFT CAB zone temp

light?

Answer 16

 Duct temp overheat

Question 17

17. Can the AFT CAB zone temp light be reset?

Answer 17

 Yes

Question 18

18. If both the primary and secondary controllers

for a pack fail, will the pack continue to operate?

Answer 18

 Yes

Question 19

19. Why would the engineers design an air

conditioning system that is so seemingly difficult to understand?

Answer 19

 To make it simple to operate

Question 20

20. When you move a zone temperature control

up, what are you asking the system to do?

Answer 20

 Add warm trim (bleed) air

Question 21

21. What do recirculation fans do?

Answer 21

 Reduce pack workload and bleed air demand (which saves fuel)

Question 22

22. How would you achieve maximum cooling on the ground?

Answer 22

 Packs in auto, APU bleed open, & engine bleeds closed

Question 23

23. Which windows do the air vent controls defrost?

Answer 23

 The # 1windows only