R a_ If there is a GND connection:
R - repair the wiring as necessary.
R (2) If the ELEC PUMP-B (2075GJ) does not operate:
R - do a check of the red indicator light on the DET-PHASE UNBALANCE, B
R ELEC PUMP (2707GJ).
R (a) If the red indicator light is on:
R WARNING : MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL
_______ R SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A R HYDRAULIC SYSTEM.
R - put the BLUE ELEC PUMP P/BSW (2704GJ) on panel 40VU in the OFF
R position ( OFF light is on and the red indicator light on the
R DET-PHASE UNBALANCE, B ELEC PUMP (2707GJ) goes off),
R - put the BLUE ELEC PUMP P/BSW (2704GJ) in the AUTO position (OFF
R light goes off),
R - put the BLUE PUMP OVRD P/BSW (2703GJ) on panel 50VU in the ON
R postion
R - look on the SD - DU and examine if the ELEC PUMP-B (2075GJ)
R operates:
R 1_ If the ELEC PUMP-B (2075GJ) does not operate and the red
R indicator light DET-PHASE UNBALANCE, B ELEC PUMP (2707GJ)
R comes on again:
R - replace the ELEC PUMP-B (2075GJ) (Ref. AMM TASK 29-12-51-R 000-001) and (Ref. AMM TASK 29-12-51-400-001).
R NOTE : Replace the ELEC PUMP-B (2075GJ) with the ELEC PUMP-Y
____ R (3075GX) which is interchangeable, if a new pump is not R available (Ref. AMM TASK 29-24-51-000-001) and (Ref. R AMM TASK 29-24-51-400-001).
R 2_ If the ELEC PUMP-B (2075GJ) operates at normal pressure and
R the red indicator light on the DET-PHASE UNBALANCE, B ELEC
R PUMP (2707GJ) does not come on:
R - no further actions are necessary.
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R (b) If the red indicator light is not on:
R - do a check for 115VAC between:
R the ELEC PUMP-B (2075GJ) connectors A/G and A/A, A/B, A/C.
R 1_ If there are 115VAC:
R - replace the ELEC PUMP-B (2075GJ) (Ref. AMM TASK 29-12-51-
R 000-001) and (Ref. AMM TASK 29-12-51-400-001).
R NOTE : Replace the ELEC PUMP-B (2075GJ) with the ELEC PUMP-Y____
R (3075GX) which is interchangeable, if a new pump is not
R available (Ref. AMM TASK 29-24-51-000-001) and (Ref.
R AMM TASK 29-24-51-400-001).
R 2_ If there are no 115VAC:
R - do a check for 28VDC between the DET-PHASE UNBALANCE, B ELEC
R PUMP (2707GJ) connectors A/G and A/F.
R a_ If there are 28VDC:
R - replace the CT-B ELEC PUMP (2706GJ) (Ref. AMM TASK 29-12-
R 15-000-001) and (Ref. AMM TASK 29-12-15-400-001).
R b_ If the fault continues:
R - replace the DET-PHASE UNBALANCE, B ELEC PUMP (2707GJ)
R (Ref. AMM TASK 29-12-18-000-001) and (Ref. AMM TASK 29-
R 12-18-400-001).
R c_ If the fault continues:
R - do a check of the wiring between:
R ELEC PUMP-B (2075GJ) connectors A/A, A/B and A/C and CB
R (2701GJ) and repair as necessary.
R d_ If there are no 28VDC:
R - do a check of the wiring between: DET-PHASE UNBALANCE, B
R ELEC PUMP (2707GJ) connector A/F and CB (2702GJ) and
R repair as necessary.
R
B. If the HYD B ELEC PUMP LO PRESS warning was shown for a short time during
the fault confirmation with engines running:
- Replace the RELAY-N2 SPEED CONDTN (2709GJ).
C. Do the test as given in Para. 3. A. or 3. B. to make sure that operation
is correct.
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TASK 29-12-00-810-805
Loss of the System Pressure of the Blue Hydraulic System
1. Possible Causes
_______________
- PRESS SW-FLT CTL, B (2151GN)
- SOL VALVE-LEAKAGE MEAS, B (2150GP)
- pushbutton switch 1884GP
- wiring
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
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