W DOC AIRBUS | TSM A320F

Failure of the Engine 2 Air Intake Anti-Ice Valve in the Closed Position

TASK 30-21-00-810-804-A
Failure of the Engine 2 Air Intake Anti-Ice Valve in the Closed Position

1. Possible Causes
  • VALVE-ENG AIR INTAKE ANTI ICE [4000DN]
  • defective muscle pressure tubes and hoses
  • P/BSW-ANTI ICE/ENG 2 [2DN2]
  • wiring between the engine 2 air intake anti-ice valve (4000DN) and the circuit breaker (1DN2)
  • C/B-ANTI ICE/ENG/2 [1DN2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 24-00-00-810-803-A
Circuit Breaker Tripped and/or C/B TRIPPED Warning
AMM 30-21-00-710-002
Operational Test of the Engine Air Intake Ice Protection (with the Engines in operation)
AMM 30-21-49-210-001
Visual Inspection of the Anti-Ice System Tubes, Ducts, and Hoses
AMM 30-21-49-210-040
Visual Inspection of the Anti-Ice System Hoses, Tubes and Ducts
AMM 30-21-51-000-040
Removal of the Engine Air-Intake Anti-Ice Valve
AMM 30-21-51-000-041
Removal of the Engine Air-Intake Anti-ice Valve
AMM 30-21-51-400-041
Installation of the Engine Air-Intake Anti-Ice Valve
AMM 30-21-51-400-042
Installation of the Engine Air-Intake Anti-ice Valve
3. Fault Confirmation
Subtask 30-21-00-710-056-A ** ON A/C NOT FOR ALL
A. Test
Do the operational test of the engine air intake ice protection AMM 30-21-00-710-002.
4. Fault Isolation
Subtask 30-21-00-865-051-A ** ON A/C NOT FOR ALL
A. Table of the circuit breakers used in this procedure:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
122VUANTI ICE/ENG/21DN2W10
Subtask 30-21-00-810-053-B ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
  • do a check of the overpressure indicator on the air intake anti-ice valve (4000DN).
   (1) If the overpressure indicator is extended:
   (2) If the overpressure indicator is not extended:
     (a) If the NAI valve operates correctly:
     (b) If the fault continues:
  • do a check of the status of the circuit breaker (1DN2).
       1 If the circuit breaker is closed:
  • make sure that there is no 28VDC at pin A/9 of the engine 2 air intake anti-ice valve (4000DN).
         a If there is no 28VDC:
         b If there is 28VDC:
  • make sure that there is no 28VDC at pin A/D2 of the ANTI ICE/ENG 2 pushbutton switch (2DN2).
    . If there is 28VDC:
    - replace the P/BSW-ANTI ICE/ENG 2 [2DN2] .
    . If there is no 28VDC:
    - Do a check and repair the wiring between the engine 2 air intake anti-ice valve (4000DN) and the circuit breaker (1DN2).
       2 If the circuit breaker (1DN2) is open:
         a If the fault continues:
  • Replace the C/B-ANTI ICE/ENG/2 [1DN2] .
Subtask 30-21-00-810-053-E ** ON A/C NOT FOR ALL
B. If the test confirms the fault:
  • do a check of the overpressure indicator on the air intake anti-ice valve (4000DN).
   (1) If the overpressure indicator is extended:
   (2) If the overpressure indicator is not extended:
     (a) If the NAI valve operates correctly:
     (b) If the fault continues:
  • do a check of the status of the circuit breaker (1DN2).
       1 If the circuit breaker is closed:
  • make sure that there is no 28VDC at pin A/9 of the engine 2 air intake anti-ice valve (4000DN).
         a If there is no 28VDC:
         b If there is 28VDC:
- make sure that there is no 28VDC at pin A/D2 of the ANTI ICE/ENG 2 pushbutton switch (2DN2).
. If there is 28VDC:
- replace the P/BSW-ANTI ICE/ENG 2 [2DN2] .
. If there is no 28VDC:
- Do a check and repair the wiring between the engine 2 air intake anti-ice valve (4000DN) and the circuit breaker (1DN2).
       2 If the circuit breaker (1DN2) is open:
         a If the fault continues:
  • Replace the C/B-ANTI ICE/ENG/2 [1DN2] .
Subtask 30-21-00-710-057-A ** ON A/C NOT FOR ALL
C. Do the operational test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:29:31 UTC
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