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
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- VALVE-WING ANTI ICE CONTROL, L (9DL)
- VALVE-WING ANTI ICE CONTROL, R (10DL)
- RELAY-ANTI ICE VALVE CONTROL (5DL)
- anti-ice control valve filter
- aircraft wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 30-11-00-710-001 Operational Test of the Wing Ice-Protection System 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
ASM 30-11/01
ASM 30-11/01
3. Fault Confirmation
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A. Test
(1) Do the operational test of the Wing Anti-Ice system (Ref. AMM TASK 30-11-00-710-001):
- if the operational test is OK, there is no fault.
- if the operational test is not OK, do the next step.
(2) At the MCDU, go to the SYSTEM REPORT/TEST AIR COND page (Ref. AMM TASK 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 P/BSW and PACK 2 P/BSW to OFF.
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(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 WAI valve is shown, do the fault isolation procedure given in Para. 4.A.
- if a message not related to WAI filter or valve is shown, do the trouble shooting procedure related to the maintenance message.
4. Fault Isolation
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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 (Ref. ASM 30-11/01):
- 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 (Ref. ASM 30-11/01):
- 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 (Ref. AMM TASK 30-11-51-000-002) and (Ref. AMM TASK 30-11-51-400-002).
(6) Do the test in Para. 3.A.(1):
- 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)), (Ref. AMM TASK 30-11-51-000-001) and (Ref. AMM TASK 30-11-51-400-001):
- if the fault continues, do the next step.
(8) Replace the RELAY-ANTI ICE VALVE CONTROL (5DL).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞30-11-00∞∞∞∞∞∞∞∞∞∞Page 205
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