Water Servicing-Panel Heating - Electrical Schematic
Figure 301
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201-299, 401-499, Aug 01/05 CES
R Water Servicing-Panel Heating - Electrical Schematic R Figure 301A
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May 01/04 CES
POTABLE WATER ICE PROTECTION - FAULT ISOLATION PROCEDURES
_________________________________________________________
TASK 30-73-00-810-801
Ice Formation in the Potable Water Lines
1. Possible Causes
_______________
- CTL UNIT-POTABLE AND WASTE WATER DEICING (3DW)
- SENSOR-POTABLE WATER DE ICING (10DW) R - 300DW (300DW)
- HEATER(s)
- microfuse
- aircraft wiring
2. Job Set-up Information
______________________
A. Referenced Information
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REFERENCE DESIGNATION
-------------------------------------------------------------------------------
30-71-00-810-805 Failure of FWD Waste-Water Ice-Protection System AMM 30-73-00-720-001 Functional Test of the Potable Water Ice-Protection AMM 30-73-00-740-001 BITE Test of the Potable Water Ice-Protection AMM 30-73-17-000-001 Removal of the Potable-Water De-icing Sensor (10DW) AMM 30-73-17-400-001 Installation of the Potable-Water De-icing Sensor
(10DW)
AMM 30-73-34-000-001 Removal of the Potable and Waste Water Ice Protection Control Unit (3DW)
AMM 30-73-34-400-001 Installation of the Potable and Waste Water Ice
Protection Control Unit (3DW)
AMM 30-73-53-000-001 Removal of the Potable-Water De-icing Heater Elements (4DW, 5DW, 6DW, 9DW)
AMM 30-73-53-400-001 Installation of the Potable-Water De-icing Heater Elements (4DW, 5DW, 6DW, 9DW)
ASM 30-73/01
3. Fault Confirmation
__________________
A. Do the BITE test of the potable water ice-protection (Ref. AMM TASK 30-73-00-740-001).
4. Fault Isolation
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
A. Maintenance Action for CONTROL UNIT 3DW
(1) If the green I/II LED of CONTROL UNIT 3DW does not come on:
- do a check of the related microfuses:
(a) If the microfuses are OK:
- replace the CTL UNIT-POTABLE AND WASTE WATER DEICING (3DW) (Ref. AMM TASK 30-73-34-000-001) and (Ref. AMM TASK 30-73-34-400-001).
1 If the fault continues:
_
- do the functional test of the potable water ice protection (Ref. AMM TASK 30-73-00-720-001) and replace the related HEATER(s) which stay(s) cold (Ref. AMM TASK 30-73-53-000-001) and (Ref. AMM TASK 30-73-53-400-001).
a If all applicable HEATERs stay cold:
_
- replace the SENSOR-POTABLE WATER DE ICING (10DW) (Ref. AMM TASK 30-73-17-000-001) and (Ref. AMM TASK 30-73-17-400-001).
(b) If one microfuse is not OK:
- do a check for a short circuit and replace the microfuse (Ref. ASM 30-73/01).
(2) If the green III/IV LED of the CONTROL UNIT 3DW does not come on:
- do the trouble shooting of the FWD waste-water ice-protection system (Ref. TASK 30-71-00-810-805)
(3) If both green LEDs do not come on:
- replace the CTL UNIT-POTABLE AND WASTE WATER DEICING (3DW) (Ref. AMM TASK 30-73-34-000-001) and (Ref. AMM TASK 30-73-34-400-001).
(a) If the fault continues:
- do a check of the subsequent signals:
- 115VAC at connector 3DW-A/14,
- 28VDC at connector 3DW-A/16,
- GND at connector 3DW-A/12,
- GND at connector 3DW-A/15 (Ref. ASM 30-73/01).
1 If one signal is missing:
_
- do a check and repair of the aircraft wiring (Ref. ASM 30-73/01).
R **ON A/C 301-399,
R A. Maintenance Action for CONTROL UNIT 3DW
R (1) If the green I/II LED of CONTROL UNIT 3DW does not come on:
R - do a check of the related microfuses:
R (a) If the microfuses are OK:
R - replace the CTL UNIT-POTABLE AND WASTE WATER DEICING (3DW)
R (Ref. AMM TASK 30-73-34-000-001) and (Ref. AMM TASK 30-73-34-R 400-001).
R 1_ If the fault continues:
R - do the functional test of the potable water ice protection
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