W DOC AIRBUS | TSM A320F

Loss of the L Ice Detector and the R Ice Detector

TASK 30-81-00-810-801-A
Loss of the L Ice Detector and the R Ice Detector

1. Possible Causes
  • DET-ICE, L [2DD1]
  • DET-ICE, R [2DD2]
  • wiring between pin A/7 of the L ice detector and the ground terminal
  • wiring between pin A/7 of the R ice detector and the ground terminal
  • wiring between pin A/1 of the L ice detector and the circuit breaker (4DD1)
  • wiring between pin A/1 of the R ice detector and the circuit breaker (4DD2)
  • C/B-ANTI ICE/ICE DET/L [4DD1]
  • C/B-ANTI ICE/ICE DET/R [4DD2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 30-81-00-710-001
Operational Test of the Ice Detection System
AMM 30-81-31-000-001
Removal of the Ice Detector
AMM 30-81-31-400-001
Installation of the Ice Detector
3. Fault Confirmation
Subtask 30-81-00-710-050-A
A. Test
Do the operational test of the ice detection system AMM 30-81-00-710-001.
4. Fault Isolation
Subtask 30-81-00-865-050-A
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
122VUANTI ICE/ICE DET/R4DD2V13
122VUANTI ICE/ICE DET/L4DD1V12
Subtask 30-81-00-810-050-A
B. If the test gives the maintenance message ICE DETECTOR 1 AND ICE DETECTOR 2:
  • do a check of the status of the circuit breakers (4DD1, 4DD2).
   (1) If these circuit breakers are closed:
  • do a check for 115VAC at pin A/1 of the L ice detector (2DD1) and the R ice detector (2DD2).
     (a) If there is 115VAC:
     (b) If there is no 115VAC:
  • do a check for a ground signal at pin A/7 of the L ice detector (2DD1) and pin A/7 of the R ice detector (2DD2).
       1 If there is no ground signal:
  • repair the wiring between pin A/7 of the L ice detector and the ground terminal and wiring between pin A/7 of the R ice detector and the ground terminal.
       2 If there is a ground signal:
  • do a check of the wiring between pin A/1 of the L ice detector and the circuit breaker (4DD1) and the wiring between pin A/1 of the R ice detector and the circuit breaker (4DD2).
         a If there is no continuity:
  • repair the above wiring.
         b If there is continuity:
  • replace the circuit breaker (4DD1) and the circuit breaker (4DD2).
   (2) If these circuit breakers are open:
  • close the circuit breakers.
     (a) If the circuit breakers trip:
  • replace the DET-ICE, L [2DD1] and the DET-ICE, R [2DD2] .
       1 If the fault continues:
  • do a check for a short to ground at the wiring between pin A/1 of the L ice detector and the circuit breaker (4DD1) and the wiring between pin A/1 of the R ice detector and the circuit breaker (4DD2).
         a If there is a short to ground:
  • repair the related wiring.
         b If there is no short to ground:
  • replace the C/B-ANTI ICE/ICE DET/L [4DD1] and the C/B-ANTI ICE/ICE DET/R [4DD2] .
     (b) If these circuit breakers stay closed and the fault continues:
  • replace the DET-ICE, L [2DD1] and the DET-ICE, R [2DD2] .
Subtask 30-81-00-710-051-A
C. Do the operational test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:29:47 UTC
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