WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILERS OR MOVE ALL
_______ PERSONS AND EQUIPMENT AWAY FROM THE SPOILERS. THE SPOILERS CAN RETRACT QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (a)  Do the deactivation procedure for the spoilers (AMM 27-61-00) or move all persons and equipment away from the spoilers.
 F.  Procedure
 S 725-015
 CAUTION:_______DO NOT PERFORM THIS TEST ON 10 KVA HMG UNITS. USE TEST EQUIPMENT ONLY ON 5 KVA HMG UNITS. PERFORMING THIS TEST ON 10 KVA HMG UNITS WILL CAUSE DAMAGE TO THE TEST EQUIPMENT.
 (1)  AIRPLANES WITH 5 KVA HMG SYSTEM;
 Do a check of the HMG Reset Signal (for 5 kva HMG only):

 (a)  
Open this circuit breaker on the P6 panel and attach a DO-NOT-CLOSE tag: 1) 6C3, HYD GEN CONT

 (b)  
Disconnect the electrical connector D7070 from the HMG control unit.

 (c)  
Connect the electrical connector D7070 to the test box.

 (d)  
Put the RELAY POWER switch and the 28vdc power switch on the test box to OFF.

 (e)  
Connect the test box to a 115vac power source which has a frequency of 400 Hertz.

 (f)  
Put the 28V DC POWER switch and the RELAY POWER switch on the test box to ON. 1) Make sure the RESET light on the test box comes on.

 (g)  
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

 (h)  
Remove the DO-NOT-CLOSE tag and close this P6 circuit breaker: 1) 6C3, HYD GEN CONT

 (i)  
Remove the electrical connector D7074 from the HMG valve V10128. 1) Do a check for 28 +2-4v dc at pin 2 and 0v dc at pin 3 of

 connector D7074.

 (j)  
Hold the GND PROX/HYD GEN switch in the HYD GEN position for a minimum of 0.5 second.

 (k)  
Release the GND PROX/HYD GEN switch.

 1)  Do a check for 28v dc at pin 3, and 0v dc at pin 2 of the electrical connector D7074.

 (l)  
Set the RELAY POWER switch on the test box to OFF. 1) Make sure the RESET light goes out and after 1.5 seconds

 comes on. 2) Make sure HYD GEN ON does not show on EICAS.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú

 24-25-00
 ú ú 03 Page 509 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

757
MAINTENANCE MANUAL

 (m)  
Set the RELAY POWER switch on the test box to ON. 1) Make sure the RESET light stays on. 2) Make sure the HYD GEN ON indication shows on EICAS.

 (n)  
Remove the DO-NOT-CLOSE tags and close these P11 circuit breakers: 1) 11R6, AC BUS SENSE LEFT 2) 11R29, AC BUS SENSE RIGHT

 (o)  
Connect the electrical connector D7074 to the HMG valve V10128.

 (p)  
Set the 28V DC POWER switch on the test box to OFF and remove the test box.

 (q)  
Connect the electrical connector D7070 to the HMG control unit.

 S 725-085
 (2)  AIRPLANES WITH HYDRAULIC SHUTOFF VALVE S270T010-1, -2, -3, -4, -5, -6, -7, -8, -9; Hydraulic Shutoff Valve Check:
 (a)  Do a check of the Hydraulic Shutoff Valve: 1) Make sure the valve indicator is in position 2. 2) Hold the GND PROX/HYD GEN switch (P61) in the HYD GEN
 position. 3) Make sure the valve indicator moves to position 1. 4) Listen to the valve motor and make sure that the motor does
 not operate after the valve has moved to position 1. 5) Release the GND PROX/HYD GEN switch (P61). 6) Make sure the valve indicator moves to position 2 in
 approximately 2 seconds. 7) Listen to the valve motor and make sure that the motor does not operate after the valve has moved to position 2. 8) Open the HYD GEN CONT circuit breaker (6C3) on the P6 panel. 9) Manually move the valve indicator to the middle position (between position 1 and position 2). 10) Close the HYD GEN CONT circuit breaker (6C3) on the P6
 panel. 11) Make sure the valve indicator moves to position 2. 12) Listen to the valve motor and make sure that the motor does
 not operate after the valve has moved to position 2.
 13) Hold the GND PROX/HYD GEN switch (P61) in the HYD GEN position and in approximately 2 seconds open the HYD GEN CONT circuit breaker (6C3).
 14) Make sure the valve indicator moves to position 1.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH HYDRAULIC MOTOR GENERATOR ú
　
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