W DOC AIRBUS | TSM A320F

Flow Selection Fault

TASK 21-51-00-810-801-A
Flow Selection Fault

1. Possible Causes
  • CTL SW-AIR COND/PACK FLOW [5HB]
  • RESISTOR- [18HB]
  • RESISTOR- [19HB]
  • ZONE CONTROLLER [8HK]
  • wiring
  • CONT-AIR COND SYSTEM 1 [47HH]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ASM 215101
AMM 21-61-00-710-001
Operational Test of the Pack Temperature-Control System
AMM 21-61-34-000-002
Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-002
Installation of the Air-Conditioning System Controller
AMM 21-63-34-000-001
Removal of the Zone Controller
AMM 21-63-34-400-001
Installation of the Zone Controller
3. Fault Confirmation
Subtask 21-51-00-710-050-A
A. Do the operational test of the pack temperature-control system.
AMM 21-61-00-710-001.
4. Fault Isolation
Subtask 21-51-00-810-050-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message FLOW SEL:
  • replace the CTL SW-AIR COND/PACK FLOW [5HB] .
NOTE: In this procedure:
  • the CTL SW-AIR COND/PACK FLOW [5HB] is referred to as the PACK FLOW SELECTOR,
  • for the subsequent aircraft wiring ASM 215101.
   (1) If the fault continues:
     (a) On the AIR COND panel 30VU:
  • do a check for continuity of the RESISTOR- [18HB] between PACK FLOW SELECTOR pins 2 and 3.
     (b) If there is no continuity:
  • replace the RESISTOR- [18HB] .
   (2) If the fault continues:
     (a) On the AIR COND panel 30VU:
  • do a check for continuity of the RESISTOR- [19HB] between PACK FLOW SELECTOR pins 3 and 4.
     (b) If there is no continuity:
  • replace the RESISTOR- [19HB] .
   (3) If the fault continues:
   (4) If the fault continues:
  • do a check and repair the wiring :
    from PACK FLOW SELECTOR (5HB) pin 2 to ZC 1 (8HK) pin A/15D,
    from PACK FLOW SELECTOR (5HB) pin 4 to ZC 1 (8HK) pin A/14D,
    from PACK FLOW SELECTOR (5HB) pin 1 to ZC 1 (8HK) pin A/13D.
Subtask 21-51-00-810-050-C ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message FLOW SELECTOR(5HB):
NOTE: In this procedure:
  • the CTL SW-AIR COND/PACK FLOW [5HB] is referred to as the PACK FLOW SELECTOR,
   (1) If the fault continues:
     (a) On the AIR COND panel 30VU:
  • do a check for continuity of the RESISTOR- [18HB] between PACK FLOW SELECTOR pins 3 and 4.
     (b) If there is no continuity:
  • replace the RESISTOR- [18HB] .
   (2) If the fault continues:
     (a) On the AIR COND panel 30VU:
  • do a check for continuity of the RESISTOR- [19HB] between PACK FLOW SELECTOR pins 2 and 3.
     (b) If there is no continuity:
  • replace the RESISTOR- [19HB] .
   (3) If the fault continues:
   (4) If the fault continues:
  • do a check and repair the wiring from:
  • the PACK FLOW SELECTOR (5HB) to the ACSC1 (47HH).
Subtask 21-51-00-710-051-A
B. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-51-00-860-050-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:24:46 UTC
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