R TASK 30-71-00-810-810

R Control Unit Failure of MID Drainmast R 1. Possible Causes
_______________
R - 25DU (25DU)
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 30-71-34-000-001 R R AMM 30-71-34-400-001 R R AMM 30-71-51-000-001 R AMM 30-71-51-400-001 R ASM 30-71/01
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 Waste-Water Ice-Protection Control-Unit Installation of the Waste-Water Ice-Protection Control-Unit 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 'DRAINMAST UNIT MID':
R - do the operational test of the CONTROL UNIT 25DU (Ref. AMM TASK 30-71-R 00-710-002).

R (1) If the green 'UNIT' LED of the CONTROL UNIT 25DU does not come on:
R - replace the 25DU (25DU) (Ref. AMM TASK 30-71-34-000-001) and (Ref.
R AMM TASK 30-71-34-400-001).

R (a) If the fault continues:
R - replace the 24DU (24DU) (Ref. AMM TASK 30-71-51-000-001) and
R (Ref. AMM TASK 30-71-51-400-001).

R (b) If the fault continues:
R - do a check and repair the wiring between:
R CONTROL UNIT 25DU connector A/4 and DRAINMAST 24DU connector
R A/D,
R CONTROL UNIT 25DU connector A/5 and DRAINMAST 24DU connector
R A/E,
R DRAINMAST 24DU connector A/C and GND,
R DRAINMAST 24DU connector A/A and GND (Ref. ASM 30-71/01).

R (2) If the green 'UNIT' 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/19 and DEU-B 300RH6 connector C/35,
R CONTROL UNIT 25DU connector A/14 and CB 21DU,
R CONTROL UNIT 25DU connector A/15 and GND (Ref. ASM 30-71/01).

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 System/Devices (Ref. TASK 23-73-00-810-827).

R B. Do the test as given in Para. 3.A.

R 5. Close-up

________
R A. Put the aircraft back to its initial configuration.
 「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 : 051-051, ∞∞30-71-00∞∞∞∞∞∞∞∞∞∞Page 223
 May 01/05 CES

 DRAIN MAST ICE PROTECTION - TASK SUPPORTING DATA
________________________________________________

 Waste-Water Ice Protection - Electrical Schematic
 Figure 301

 「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 : 001-049, 052-099, 101-149, 201-299, ∞∞30-71-00∞∞∞∞∞∞∞∞∞∞Page 302
 May 01/05 CESR Waste-Water Ice Protection - Electrical Schematic R Figure 301A

 「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 : 051-051, ∞∞30-71-00∞∞∞∞∞∞∞∞∞∞Page 303
 May 01/05 CES

 Waste-Water Ice Protection - Electrical Schematic
 Figure 301B

 「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 : 151-199, 401-499, ∞∞30-71-00∞∞∞∞∞∞∞∞∞∞Page 304
 Aug 01/05 CES

 INTENTIONALLY BLANK

 「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 ∞∞30-71-00∞∞∞∞∞∞∞∞∞∞Page 305

 Waste-Water Ice Protection - Electrical Schematic R Figure 301C (SHEET 1)
　
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