R TASK 24-20-00-810-865
R Failure of the ENG MASTER SW 2 Signal to the GCU 2 R 1. Possible Causes
_______________
R - GCU-2 (1XU2)
R - CTL SW-ENG/MASTER 2 (2KC)
R - wiring
R 2. Job Set-up Information
______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
R AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
R AMM 24-41-00-740-002 Operational Check of GAPCU via CFDS
R ASM 24-22/03
R ASM 76-12/01
R 3. Fault Confirmation__________________
R A. Test
R (1) Do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R (a) If the BITE test gives the message TEST FAILED: R - do the trouble shooting given in Para 4.A.
R (b) If the BITE test gives the message TEST PASSED: R - do the trouble shooting given in Para 4.B.
R 4. Fault Isolation
_______________
R A. If the BITE test gives the message TEST FAILED:
R - push the line key adjacent to the TEST FAILED message.
R (1) If the maintenance message GCU2 (1XU2) comes into view:
R - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and (Ref.
R AMM TASK 24-22-34-400-001).
R B. If the BITE test gives the message TEST PASSED:
R - do a check of the contact of the ENG/MASTER 2 control switch (2KC) for
R correct operation between pins 3A and 1A (Ref. ASM 76-12/01).
R (1) If the contact do not operate correctly:
R - replace the CTL SW-ENG/MASTER 2 (2KC) on the ENG panel 115VU.
「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 : 401-499, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page A257
Aug 01/05 CES
R (2) If the contact operate correctly:
R - do a check of the fuel-cutoff status wiring (Ref. ASM 24-22/03) for
R an open circuit between pin 3A of the ENG/MASTER 2 control switch
R and pin A/8C of the GCU 2.
R (a) If there is no continuity:
R - repair or replace as necessary.
R (b) If there is continuity:
R - replace the GCU-2 (1XU2) (Ref. AMM TASK 24-22-34-000-001) and
R (Ref. AMM TASK 24-22-34-400-001).
R C. Do the test given in para. 3.
R TASK 24-20-00-810-866
R Failure of the ENG/APU FIRE Panel or its Wiring to the GCU 1
R 1. Possible Causes_______________
R - GCU-1 (1XU1)
R - ENG/APU FIRE PNL (1WD)
R - wiring
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------
R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R AMM 24-22-34-000-001 Removal of the GCU-1(2) (1XU1, 1XU2)
R AMM 24-22-34-400-001 Installation of the GCU-1(2) (1XU1, 1XU2)
R AMM 24-41-00-740-002 Operational Check of GAPCU via CFDS
R AMM 26-12-12-000-001 Removal of the ENG/APU Fire Panel (1WD)
R AMM 26-12-12-400-001 Installation of the ENG/APU Fire Panel (1WD)
R ASM 24-22/02
R 3. Fault Confirmation__________________
R A. Test
R - do the BITE test of the GAPCU (Ref. AMM TASK 24-41-00-740-002).
R NOTE : It is not necessary to do the trouble shooting for the CFDS
____ R message ENG1 FIRE PB SW (1WD)/ GCU1 (1XU1) if the flight or R maintenance log books show that the flight crew or the maintenance R personnel pushed the ENG 1 FIRE pushbutton switch on the ENG/APU R FIRE panel after an engine-fire condition or to do a test of the R engine fire loop. R To remove this CFDS message at the start of the subsequent flight, R release and push the ELEC/GEN 1 pushbutton switch (2XU1) before R the subsequent engine start sequence. R If the flight or maintenance crew did not push the ENG 1 FIRE R pushbutton switch, the trip was accidental and you must do the R trouble shooting procedure that follows:
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