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R  - do a check for a short circuit (Ref. ASM 30-71/01), 
R  - replace the microfuse. 
R  H. If the green I/II LED of CONTROL UNIT 35DU does not come on: 
R  - do a check of the related microfuses. 
R  (1) If the microfuses are OK: 
R  - replace the CONTROL UNIT 35DU (Ref. AMM TASK 30-71-34-000-001) and 
R  (Ref. AMM TASK 30-71-34-400-001). 
R  (2) If the fault continues: 
R  NOTE : Remove the insulation from around the SENSOR 60DU and the____ 
R  HEATERS 61DU and 62DU. 
R  - apply cooling spray to the SENSOR 60DU for at least 10 s, 
R  - stop for approx. 120 s, 
R  - do a check of the temperature of the HEATERS 61DU and 62DU. 
R  (a) If the HEATERs 61DU and 62DU stay cold: 
R  - replace the SENSOR-WASTE WATER DE ICING (60DU) (Ref. AMM TASK 
R  30-71-17-000-001) and (Ref. AMM TASK 30-71-17-400-001). 
R  (b) If the HEATER 61DU stays cold: 
R  - replace the HEATER 61DU (Ref. AMM TASK 30-71-53-000-001) and 
R  (Ref. AMM TASK 30-71-53-400-001).

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R  (c) If the HEATER 62DU stays cold: 
R  - replace the HEATER 62DU (Ref. AMM TASK 30-71-53-000-001) and 
R  (Ref. AMM TASK 30-71-53-400-001). 
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. 
R  **ON A/C ALL 
R  J. Do the test as given in Para. 3.A.
 5. Close-up________
 A. Put the aircraft back to its initial configuration.

 

R **ON A/C 051-051,
R TASK 30-71-00-810-809 R MID Drainmast-Heater Failure R 1. Possible Causes
_______________
R - 24DU (24DU)
R - DEU-B (300RH6)
R - wiring

R 2. Job Set-up Information

______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R 23-73-00-810-827 R R AMM 23-73-47-000-001 R AMM 23-73-47-400-001 R R AMM 30-71-00-710-001 R AMM 30-71-00-710-002 R R AMM 30-71-51-000-001 R AMM 30-71-51-400-001 R ASM 30-71/03
R 3. Fault Confirmation
__________________ DEU-B - Fault in DEU-B 300RHx with connected Systems/Devices Removal of the Decoder/Encoder Units (DEU) B 300RH Installation of the Decoder/Encoder Unit (DEU) B 300RH Operational Test of the Drainmast Ice Protection Operational Test of the Waste-Water Ice-Protection Heater-Elements Removal of the Drain Mast Installation of the Drain Mast
R A. Do the operational test of the waste-water ice-protection system (Ref. R AMM TASK 30-71-00-710-001).
R 4. Fault Isolation
_______________
R A. If the fault message on the PTP 110RH shows 'CHECK AFT CARGO DRAINAGE':
R - do the operational test of the CONTROL UNIT 25DU (Ref. AMM TASK 30-71-R 00-710-002).

R (1) If the green 'HTR' LED of the CONTROL UNIT 25DU does not come on:
R - replace the 24DU (24DU) (Ref. AMM TASK 30-71-51-000-001) and (Ref.
R AMM TASK 30-71-51-400-001).

R (a) If the fault continues:
R - do a check and repair the wiring between:
R CONTROL UNIT 25DU connector A/8 and DRAINMAST 24DU connector
R A/B,

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R  DRAINMAST 24DU connector A/C and GND, 
R  DRAINMAST 24DU connector A/A and GND (Ref. ASM 30-71/03). 
R  (2) If the green 'HTR' LED of the CONTROL UNIT 25DU comes on: 
R  - do a check and repair the wiring if necessary between: 
R  CONTROL UNIT 25DU connector A/11 and DEU-B 300RH6 connector C/34, 
R  CONTROL UNIT 25DU connector A/14 and CB 21DU, 
R  CONTROL UNIT 25DU connector A/15 and GND (Ref. ASM 30-71/03). 
R  (a) If the fault continues: 
R  - replace the DEU-B (300RH6) (Ref. AMM TASK 23-73-47-000-001) and 
R  (Ref. AMM TASK 23-73-47-400-001). 
R  (3) If the fault continues: 
R  - do the trouble shooting procedure for the Fault in DEU-B 300RH6 
R  with connected Systems/Devices (Ref. TASK 23-73-00-810-827). 
　
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