R (a) If all the signals are OK:

R NOTE : Remove the insulation from around the SENSOR 141DU, the

____ R HEATERS 142DU, 146DU and 147DU.
R - apply cooling spray to the SENSOR 141DU for at least 10 s,
R - stop for approx. 120 s,
R - do a check of the temperature of the HEATERS 142DU, 146DU and
R 147DU.

R 1_ If the HEATERS 142DU, 146DU and 147DU stay cold:
R - replace the SENSOR-WASTE WATER DE ICING (141DU) (Ref. AMM
R TASK 30-71-17-000-001) and (Ref. AMM TASK 30-71-17-400-001).

R 2_ If the HEATER 142DU stays cold:
R - replace the HEATER ELEMENT-WASTE WATER DE ICING (142DU)
R (Ref. AMM TASK 30-71-53-000-003) and (Ref. AMM TASK 30-71-R 53-400-003).

R 3_ If the HEATER 146DU stays cold:
R - replace the HEATER ELEMENT-WASTE WATER DE ICING (146DU)
R (Ref. AMM TASK 30-71-53-000-003) and (Ref. AMM TASK 30-71-R 53-400-003).

R 4_ If the HEATER 147DU stays cold:
R - replace the HEATER ELEMENT-WASTE WATER DE ICING (147DU)
R (Ref. AMM TASK 30-71-53-000-003) and (Ref. AMM TASK 30-71-R 53-400-003).

R (b) If there is no 115 VAC:
R - do a check and repair the wiring between:
R CONTROL UNIT 140DU connector A/14 and CB 8DU.

 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 301-399, ∞∞30-71-00∞∞∞∞∞∞∞∞∞∞Page 213
 May 01/04 CES

R  (c) If there is no 28 VDC: 
R  - do a check and repair the wiring between: 
R  CONTROL UNIT 140DU connector A/16 and CB 9DU. 
R  (d) If there is no GND: 
R  - do a check and repair the related wiring between: 
R  CONTROL UNIT 140DU connector A/12 and GND, 
R  CONTROL UNIT 140DU connector A/15 and GND (Ref. ASM 30-71/01). 
R  (3) If one microfuse is not OK: 
R  - do a check for a short circuit (Ref. ASM 30-71/01), 
R  - replace the microfuse.
 **ON A/C ALL
 E. Do the test as given in Para. 3.A.
 5. Close-up________
 A. Put the aircraft back to its initial configuration.

 Failure of AFT Waste-Water Ice-Protection System
 1. Possible Causes
_______________
 - CONTROL UNIT (15DU)
 - DRAINMAST-AFT (14DU) R - 25DU (25DU) R - 24DU (24DU) R - 50DU (50DU)

 - wiring R - CONTROL UNIT (33DW) R - HEATER 51DU R - HEATER 42DU R - microfuse R - CONTROL UNIT 35DU R - SENSOR-WASTE WATER DE ICING (60DU) R - HEATER 61DU R - HEATER 62DU

 2. Job Set-up Information
______________________
R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION R -------------------------------------------------------------------------------
R No specific cooling spray
R B. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 30-71-00-710-002
R AMM 30-71-17-000-001 R AMM 30-71-17-400-001 R
AMM 30-71-34-000-001
AMM 30-71-34-400-001
AMM 30-71-51-000-001
AMM 30-71-51-400-001 R AMM 30-71-53-000-001 R R AMM 30-71-53-400-001 R Operational Test of the Waste-Water Ice-Protection Heater-Elements Removal of the Waste-Water De-icing Sensor (40DU) Installation of the Waste-Water De-icing Sensor (40DU)Removal of the Waste-Water Ice-Protection Control-UnitInstallation of the Waste-Water Ice-Protection Control-UnitRemoval of the Drain MastInstallation of the Drain Mast Removal of the Waste-Water De-icing Heater Elements (41DU, 42DU) Installation of the Waste-Water De-icing Heater Elements (41DU, 42DU) -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------

R AMM 30-73-00-740-001 BITE Test of the Potable Water Ice-Protection R AMM 30-73-34-000-001 Removal of the Potable and Waste Water Ice Protection R Control Unit (3DW) R AMM 30-73-34-400-001 Installation of the Potable and Waste Water Ice R Protection Control Unit (3DW)
 ASM 30-71/01
 3. Fault Confirmation
__________________
 A. Do the operational test of the waste-water ice-protection system (Ref. AMM TASK 30-71-00-710-002).
 4. Fault Isolation
_______________
 A. If the green 'UNIT' LED of the CONTROL UNIT 15DU does not come on:
 - replace the CONTROL UNIT (15DU) (Ref. AMM TASK 30-71-34-000-001) and (Ref. AMM TASK 30-71-34-400-001).
　
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