A320 CH 21

1. PACK OUTPUT GOES TO MIXER UNIT WHICH MIX ED BY AIR FLOW FROM CABIN BY 2 RECIRCULATION FAN TO REDUCE  DEMAND ANF SAVING FUEL
2. AIR FROM MIXER GOES TO COCKPIT, FWD CABIN, AFT CABIN VIA TAV’S
3. MIX UNIT  & 2 FANS ARE IN FWD CARGO AFT WALL
4. EACH ZONE HAVE TAV TO ADJUST TEMP
5. FCV (FLOW CONT VLV) CONTROLS THE BLEED PRESS TO PACKS
6. 2 ACSC (AIR COND SYS CONT) CONTROL THE PACKS OUTPUT BY CONTROLLING BYPASS VLV & RAM AIR INLET
7. RAI (RAM AIR INLET) MUST FULLY OPEN AND BV ( BYPASS VLV) FULLY CLOSE FOR MAX COOL
8. IN T/O & LAND RAI IS FULLY CLOSE BUT IN MAX HOT IS NEARLY CLOSE
9. ACSC IN CLASSIC VERSION REPLACED BY PC (PACK CONT ) & ZC (ZONE CONT)
10. ZC CONTROLS THE HAV (HOT AIR VLV) & TAV
11. ZONE TEMP AND CAB PRESS PARAMETER  SHOWN IN ECAM AIR COND PAGE & CRUISE PAGE
12. 2 CPC CONTROL ONE OFV (OUT FLOW VLV)
13. OFV HAS 3 MOTOR : ONE FOR EACH CPC AND ONE CONNECTED TO V/S SW FOR MAN
14. CPC SEND SIG TO ADIRU AND FMGC FOR PRESS/DEPRESS SCADULE
15. TAPRV OR HOT AIR VLV HAS 2 SOLENOID
16. BLOWER & EXT FAN POWERED WHEN A/C POWERED
17. AEVC (AVIONICS EQUIP VENT COMPUTER) CONTROLS FAN & 2 SKIN VLV
18. R/H SKIN VLV IS OVERBOARD VLV & L/H ONE IS INLET BYPASS
19. BOTH SKIN VLV CLOSED IN FLT AND GND IF TEMP IS LOW AND IN GND ARE OPEN IN NORMAL TEMP
20. IN SMOKE INLET V CLOSE AND OUTLET PARTIALLY CLOSED
21. GALLY AND LAV AUTO VENT
22. AIR DROWN TO CARGO BY EXT FAN IN GND AND DIFF PRESS IN FLT
23. CHC (CARGO HEAT CONT) CONTROLS TAV OF CARGO
24. FWD CARGO  EXT FAN AND OUTLET VLV ARE IN R/H WALL , INLETS  IN BOTH CARGO ARE  L/H
25. AFT CARGO EXT FAN AND OUTLET IN AFT WALL
26. 2 SAFTEY VLV ARE IN AFT WALL OF BULKHEAD

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