(b)  
11R29, AC BUS SENSE RIGHT

 S 614-015
 (4)  Service the left hydraulic system (Ref 12-12-01).
 F. Test the HMG shutoff valve installation.
 S 864-016
 (1)  
Supply electrical power (Ref 24-22-00).

 S 864-017

 (2)  
Pressurize the left hydraulic system (Ref 29-11-00).

 (a)  If you use the ACMPs to pressurize the left hydraulic system, do these steps: 1) Pressurize the left hydraulic system and the right
 hydraulic system with the ACMPs (Ref 29-11-00). 2) Put the PTU switch on the P61 panel to the ON position.
 S 214-018
 (3)  
Check the HMG shutoff valve for hydraulic fluid leaks.

 (4)  
Check the HMG shutoff valve is in the closed position.

 S 714-020

 (5)  
Do an operational check as follows:

 (a)  
Hold the GND PROX/HYD GEN switch on miscellaneous test panel P61, in the HYD GEN position.

 (b)  
Make sure the HMG shutoff valve moves to the open position. The EICAS message HYD GEN VAL must also be displayed on the lower EICAS panel.

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

 S 214-019
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757
MAINTENANCE MANUAL

 (d)  Make sure the HMG shutoff valve returns to the closed position. The EICAS message HYD GEN VAL must not be displayed on the EICAS lower panel.
 (6)  S 864-021Remove the hydraulic power if it is not necessary (Ref 29-11-00).
 (7)  S 864-022Remove the electrical power if not necessary (Ref 24-22-00).

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757 MAINTENANCE MANUAL
 HYDRAULIC MOTOR GENERATOR ACCUMULATOR - REMOVAL/INSTALLATION
____________________________________________________________
 1.  General
_______
 A.  This procedure has two tasks. The first task removes the hydraulic motor generator (HMG) accumulator from the airplane. The second task installs the HMG accumulator on the airplane.
 TASK 24-25-04-024-001
 2.  Remove the HMG Accumulator (Fig. 401)
__________________________
 A.  Equipment
 (1)  Main Gear Door Locks (Ref 32-00-15)
 B.  References
 (1)  
12-15-06/301, Hydraulic Motor Generator Accumulator

 (2)  
29-11-00/201, Main Hydraulic Systems

 (3)  
32-00-15/201, Landing Gear Door Locks

 (4)  
32-00-20/201, Landing Gear Downlocks

 C.  Access
 (1)  
Location Zones
 143 Main Landing Gear Wheel Well (LH Side)

 (2)  
AIRPLANES WITH 5 KVA HMG;

 Access Panels
 732 Main Landing Body Door (LH Side)

 (3)  
AIRPLANES WITH 10 KVA HMG;

 Access Panels
 732 Main Landing Body Door (LH Side)
 197KL Central Hydraulic Service Center

 D.  Prepare for Removal
 S 214-005
 (1)  Make sure the landing gear downlocks are installed
 (AMM 32-00-20/201).

 S 014-006
 WARNING: REFER TO AMM 32-00-15/201 FOR DOOR LOCK INSTALLATION PROCEDURE.
_______ RAPID ACTION OF DOORS MAY CAUSE INJURY OR DAMAGE IF LOCKS ARE NOT PROPERLY INSTALLED.
 (2)  
Open the doors for the left main landing gear and install the door locks (AMM 32-00-15/201).

 S 864-007

 (3)  
Remove the pressure from the left hydraulic system
 (AMM 29-11-00/201).

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