1.19.2010

B747 CHAPTER 21

21

1. TEMP REGULATION DONE BY PRECOOLER
2. PRESS REG BY HI STAGE VLV
3. AIR COND GND CONNECTION IS DOWNSTREAM OF PACK1,3
4. PACKS HAVE A DUAL HEAT EXCHANGER
5. PACK SELECTS LOWEST TEMP OF 3 PACK AS REF IN AUTO
6. IF ALL ZONE CONT ARE IN MAN, ZONE CONT BYPASSED AND REF IS 35°F
7. ZONE TEMP SENSORS ARE IN R/H OF CABIN
8. ZONE1 DUCT SENSOR IS IN FWD CARGO OTHERS IN CABIN
9. ZONE TAV, RAM AIR INLET, AND EXIT,TBV (TURB BYPASS) ARE 115VAC
10. MAIN TAV IS 28VDC
11. PACK WILL CLOSE AND PACK TRIP LIT ON IF:
                       DUCT O/H (185°F)
                                            COMP DISCH TEMP  >    425°F
                                                                              DISCRAPANCY OF TBV AND RAI OR RAE
                                                                              PRESS <12PSI  TO GIVE PRIORITY TO LE FLAP
12. ONLY PACK2 TRIP IF PRESS RELIEF VLV OPEN
13. RAI AND RAE ACTUATORS ARE I/W
14. TAV AND STARTER ACTUATOR ARE I/W
15. EACH DUCT HAS 3 SENSOR:
                                                   BULB: FOR IND
                                                   SENSOR: FOR CONT
                                                   O/H: VLV CLOSE
16. BITE TEST ONLY TESTS SENSOR
17. Z TAV IF O/H, IT CAN’T BE OPEN UNTILL RESET AFTER TEMP DECREACED
18. ALL PACK VLV CLOSE, THEN ALL ZTAV WILL CLOSE
19. TBV, RAI, RAE HAVE PREPOSITION FOR FAST START ITS DIFFER IN FLT
20. RAI AND RAE ARE FULLY OPEN IN GND
21. 2 AFT CARGO HEAT VLV CONT BY 2 THERMOSTATS (IN 65°F)
22. IF BOTH CARGO HEAT VLV OPEN ON LIT ILLUM
23. CARGO SMOKE AFT SEL, BOTH CARGO HEAT VLV CLOSE
24. 2 BLOWERS FOR EQUIP COOLING, BOTH WORK ON GND BUT ONE IN FLT IF SW BE
       AT   NORM
25. BLOWER SW AT ALT, NORMAL BLOWER WILL OFF
26. NO AIR FLOW LIT WILL ON BY 2 SENSORS:
                                                             IN UPPER DECK DUCT: CAN TEST BY CB  PULL
                                                             MEC: CAN TEST BY SW AT PNL
27. FWD CARGO S/O VLV CLOSED BY SMOKE
28. OVERBOARD VLV OPEN IN SMOKE ALSO IN GND
29. DUMP VLV OPENED IN SMOKE
30. 2 OUT FLOW VLV’S EACH HAVE ONE DC MOTOR FOR MANUAL IF SW AT MAN L OR MAN R AND ONE AC MOTOR FOR AUTO CONT BY CPC
31. 4 MECH OP RELIEF VLV PREVENT NEGATIVE PRESS(IAG AND IAH HAVE 6)
32. IF AUTO MODE FAIL SW TRIP TO MAN AND AUTO FAIL LIT WILL ON
33. OFW RELAYS ARE IN E8
34. CAB ALT REACH 10000 FT, WE HAVE HORN
35. WING ANTI ICE OPEN ONLY IN FLT
36. WHEN SMOKE BLOWER OFF, OVERBOARD VLV OPEN
37. ZTAV,TBV,RAI AND RAE CAN OPERATE WITHOUT PNEU
38. BLOWERS AND FCV ARE IN FWD CARGO
39. MAIN TAV OP IF PACK VLV ON AND ∆P >1 PSI
40. PACK CONTROLLER REGULATES PLENUM CHAMBER TEMP
41. PACK ALTERNATE WARN SW IS BELOW P4

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