W DOC AIRBUS | TSM A320F

Wing Anti-Ice Low Pressure in Left (Right) System

TASK 30-11-00-810-803-A
Wing Anti-Ice Low Pressure in Left (Right) System

WARNING: DO NOT TOUCH THE ANTI-ICE DUCTS UNTIL THEY ARE COOL. THE TEMPERATURE OF THE DUCTS STAYS HIGH FOR SOME TIME AFTER THE ENGINE STOPS.
1. Possible Causes
  • engine bleed faults
  • anti-ice control-valve filter
  • VALVE-WING ANTI ICE CONTROL, L [9DL]
  • VALVE-WING ANTI ICE CONTROL, R [10DL]
  • RELAY-ANTI ICE VALVE CONTROL [5DL]
  • aircraft wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 30-11-00-810-806-A
Wing Anti-Ice Control-Valves Do Not Operate
TSM TASK 36-11-00-810-809-A
Bleed Pressure-Regulator Valve of the Engine 1 Blocked in the Closed Position or Regulation Too Low
TSM TASK 36-11-00-810-810-A
Bleed Pressure-Regulator Valve of the Engine 2 Blocked in the Closed Position or Regulation Too Low
AMM 30-11-00-710-001
Operational Test of the Wing Ice-Protection System
ASM 301101
AMM 30-11-51-000-001
Removal of the Wing Anti-Ice Control Valve
AMM 30-11-51-000-002
Removal of the Anti-Ice Valve Filter
AMM 30-11-51-400-001
Installation of the Wing Anti-Ice Control Valve
AMM 30-11-51-400-002
Installation of the Anti-Ice Valve Filter
AMM 31-32-00-860-002
Procedure to Get Access to the SYSTEM REPORT/TEST/AIR COND Page
3. Fault Confirmation
Subtask 30-11-00-710-052-A
A. Test
   (1) Make sure that there are no engine bleed faults before you do the troubleshooting procedure of the WAI system (Ref. 36-11-00).
   (2) If there are no engine bleed faults :
NOTE: The steps in Para. 3.A.(2) can show engine bleed faults that are not shown on the PFR.
     (a) If one of these messages is shown on the PFR:
  • LH WAI FILTER OR VALVE
    or
  • L WAI VALVE
       1 Do the troubleshooting procedure of the bleed pressure-regulator valve of the engine 1 blocked in the closed position or regulation too low (Ref. TSM TASK 36-11-00-810-809).
     (b) If one of these messages is shown on the PFR:
  • RH WAI FILTER OR VALVE
    or
  • R WAI VALVE
       1 Do the troubleshooting procedure of the bleed pressure-regulator valve of the engine 2 blocked in the closed position or regulation too low (Ref. TSM TASK 36-11-00-810-810).
   (3) Do the operational test of the WAI system AMM 30-11-00-710-001.
     (a) If the test is OK:
  • No maintenance step is necessary.
     (b) If the test is not OK:
  • Do the next step.
   (4) At the MCDU, go to the SYSTEM REPORT/TEST AIR COND page AMM 31-32-00-860-002 and set TEMP CTL.
     (a) At the CAB TEMP CONT page, set TEST:
  • If the message PACK 1 AND PACK 2 OFF is shown, do step (c)
  • If the message PACK 1 AND 2 SELECT OFF is shown, do the next step.
     (b) At the AIR COND panel 30VU, set the PACK 1 and PACK 2 pushbutton switches to the OFF position.
     (c) At the MCDU, set CONTINUE and wait until the message END OF TEST is shown:
  • If a message related to the WAI filter or valve is shown, go to the Para. Fault Isolation
  • If a message not related to WAI filter or valve is shown, do the troubleshooting procedure related to the maintenance message
  • If there are no fault messages shown, do the test given in Para. 3.A.(3).
4. Fault Isolation
Subtask 30-11-00-810-052-A
A. Procedure
   (1) At the ANTI ICE overhead panel 25VU, push (in) the WING P/BSW (3DL).
   (2) At the applicable wing anti-ice control-valve free connector A, pin A, do a check for 28VDC ASM 301101:
  • If there is no 28VDC, do step (8)
  • If there is 28VDC, do the next step.
NOTE: The check for 28VDC must be done during the 30 seconds before the ground test relay (4DL) operates. The ground test relay stops system operation after 30 seconds, to prevent heat damage to the aircraft when it is on the ground.
   (3) Do a check at the wing anti-ice control-valve free connector A, pin C, for a ground ASM 301101:
  • If there is no ground, do step (10)
  • If there is a ground, do the next step.
   (4) Visually examine the anti-ice control-valve filter for areas of high contamination and clean or replace as necessary:
  • If the filter is OK, do step (7)
  • If the filter is unserviceable or damaged, do the next step.
NOTE: The filter is unserviceable if there is high contamination of more than one half of the total mesh area. A blocked filter will not let sufficient air flow to operate the valve mechanism.
   (5) Replace the filter AMM 30-11-51-000-002 and AMM 30-11-51-400-002.
   (6) Do the test in Para. 3.A.(4):
  • If the fault continues, do the next step.
   (7) Replace the applicable VALVE-WING ANTI ICE CONTROL, L [9DL] ( VALVE-WING ANTI ICE CONTROL, R [10DL] ), AMM 30-11-51-000-001 and AMM 30-11-51-400-001:
  • If the fault continues, do the next step.
   (8) Replace the RELAY-ANTI ICE VALVE CONTROL [5DL] .
   (9) Do the test in Para. 3.A.(4):
  • If the fault continues, do the next step.
   (10) Do a check of the aircraft wiring ASM 301101, and repair as necessary.
   (11) Do the test in Para. 3.A.(4).
   (12) If the fault continues:
[Rev.8 from Aug 2018] 2026.04.04 04:29:30 UTC
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