Loss of Power Supply of the WHC 2
1. Possible Causes
_______________
- WHC-2 (2DG2)
- wiring between the WHC 2 (2DG2) pin B/R and the ground terminal
- wiring between the WHC 2 pin B/C and the circuit breaker (5DG2)
- C/B-ANTI ICE/WHC/2 (5DG2)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 30-42-34-000-001 Removal of the Window Heat Computer (WHC)
(2DG1,2DG2).
AMM 30-42-34-400-001 Installation of the Window Heat Computer (WHC)
(2DG1,2DG2).
AMM 31-32-00-869-002 Procedure for Class 3 Faults Reading
ASM 30-42/02
3. Fault Confirmation
__________________
A. Test
(1) On the CFDS MENU page, get access to the AVIONICS STATUS page (Ref. AMM TASK 31-32-00-869-002).
4. Fault Isolation
_______________
A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
-------------------------------------------------------------------------------
122VU ANTI ICE/WHC/2 5DG2 W13
B. If the test gives the maintenance message NO WHC 2 DATA:
- do a check of the status of the circuit breaker (5DG2).
(1) If the circuit breaker is closed:
- do a check for 28VDC at pin B/C of the WHC 2 (2DG2) (Ref. ASM 30-42/02).
(a) If there is 28VDC:
- replace the WHC-2 (2DG2), (Ref. AMM TASK 30-42-34-000-001) and (Ref. AMM TASK 30-42-34-400-001).
「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 ∞∞30-42-00∞∞∞∞∞∞∞∞∞∞Page 290
Aug 01/05 CES
(b) If there is no 28VDC:
- do a check for a ground signal at pin B/R of the WHC 2 (2DG2).
1_ If there is no ground signal:
- repair the wiring between the WHC 2 (2DG2) pin B/R and the
ground terminal.
2 If there is a ground signal:
_
- do a check of the wiring between the WHC 2 pin B/C and the circuit breaker (5DG2).
a If there is no continuity:
_
- repair the above wiring. b If there is continuity:
_ - replace the circuit breaker (5DG2).
(2) If the circuit breaker is open:
- close the circuit breaker.
(a) If the circuit breaker trips again:
- replace the WHC-2 (2DG2). 1 If the fault continues:
_
- do a check for a short to ground at the wiring between the WHC 2 pin B/C and the circuit breaker (5DG2).
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/WHC/2 (5DG2).
(b) If the circuit breaker stays closed and the fault continues:
- replace the WHC-2 (2DG2).
C. Do the BITE test given in Para. 3.
Loss of the Heating of the Left and Right Windshields
1. Possible Causes
_______________
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 30-42-00-710-001 Operational Test of the Windshield Anti-Icing and Defogging
3. Fault Confirmation
__________________
A. Test
Not applicable.
4. Fault Isolation
_______________
A. The ANTI ICE L+R WINDSHIELD warning is shown on the upper ECAM DU after the loss of the heating of the left and right windshields. To do the trouble shooting, refer to the POST FLIGHT REPORT and start the trouble shooting from the first ANTI ICE WINDSHIELD warning and its related maintenance message (Ref. 30-ECAM Page Block 101). After this step, on the upper ECAM DU, the ANTI ICE L+R WINDSHIELD warning goes out of view and the WINDSHIELD warning related to the other windshield with the related maintenance message comes into view.
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