24-25-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
15) Listen to the valve motor and make sure that the motor does
not operate after the valve has moved to position 1.
16) Release the GND PROX/HYD GEN switch (P61).
17) Manually move the valve indicator to the middle position
(between position 1 and position 2).
18) Hold the GND PROX/HYD GEN switch (P61) in the HYD GEN
position.
19) Close the HYD GEN CONT circuit breaker (6C3) on the P6
panel.
20) Make sure the valve indicator moves to position 1.
21) Listen to the valve motor and make sure that the motor does
not operate after the valve has moved to position 1.
ú 22) AIRPLANES WITH 10 KVA HMG;
ú Make sure the valve indicator moves to position 2 in
approximately 15 seconds.
23) Open and close the HYD GEN CONT circuit breaker (6C3) on
the P6 panel.
(b) If any step in the Hydraulic Shutoff Valve Check fails, the
valve is defective. Replace the valve (AMM 24-25-03/401).
S 725-062
(3) AIRPLANES WITH 5 KVA HMG SYSTEM;
Do a check of the Hydraulic Shutoff Valve (5 kva HMG only):
WARNING: MAKE SURE YOU DO THE FLIGHT MODE SIMULATION CORRECTLY._______
IF THE PROCEDURE IS NOT DONE CORRECTLY, INJURY TO PERSONS
OR DAMAGE TO EQUIPMENT CAN OCCUR.
(a) Do the Flight Mode Simulation procedure for the No. 1
air/ground system (AMM 32-09-02).
(b) Open these circuit breakers on the P11 panel and attach
DO-NOT-CLOSE tags:
1) 11R6, AC BUS SENSE LEFT
2) 11R29, AC BUS SENSE RIGHT
a) Make sure the hydraulic shutoff valve moves to the open
position (1) and HYD GEN VAL shows on EICAS.
(c) Remove the DO-NOT-CLOSE tags and close these P11 circuit
breakers:
1) 11R6, AC BUS SENSE LEFT
2) 11R29, AC BUS SENSE RIGHT
a) Make sure the hydraulic shutoff valve moves to the
closed position (2) and HYD GEN VAL does not show on
EICAS.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú
24-25-00
ú ú 04.1 Page 511 ú Sep 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL
(d) Open and close this circuit breaker on the P6 panel to reset the GCU: 1) 6C3, HYD GEN CONT
S 725-082
(4) AIRPLANES WITH 10 KVA HMG SYSTEM; Do a check of the Hydraulic Shutoff Valve (10kva HMG only):
WARNING: MAKE SURE YOU DO THE FLIGHT MODE SIMULATION CORRECTLY.
_______ IF THE PROCEDURE IS NOT DONE CORRECTLY, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(a)
Do the Flight Mode Simulation procedure for the No. 1
air/ground system (AMM 32-09-02).
(b)
Open these circuit breakers on the P11 panel and attach DO-NOT-CLOSE tags: 1) 11R6, AC BUS SENSE LEFT 2) 11R29, AC BUS SENSE RIGHT
a) Make sure the hydraulic shutoff valve moves to the open position (1) and HYD GEN VAL shows on EICAS.
b) After 15 seconds approximately, make sure the hydraulic shutoff valve moves to the closed position (2) and HYD GEN VAL does not show on EICAS.
(c)
Remove the DO-NOT-CLOSE tags and close these P11 circuit breakers: 1) 11R6, AC BUS SENSE LEFT 2) 11R29, AC BUS SENSE RIGHT
(d)
Open the following circuit breaker, wait for approximately 35 seconds and then close it to reset the GCU: 1) 6C3, HYD GEN CONT
S 725-017
(5) Do a check of the Bus Power Transfer:
(a) Open these circuit breakers to remove electrical power from all buses supplied by the HMG: 1) 6C7, HYD GEN 28V DC POWER
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú
24-25-00
ú ú 02 Page 512 ú Sep 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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