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 24-31-00
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A

757 MAINTENANCE MANUAL
 MAIN BATTERY - REMOVAL/INSTALLATION
___________________________________
 1.  General_______
 A.  The main battery is on the right side of the forward equipment center.
 B.  It is possible that a battery hoist is kept in the aft left area of the forward equipment center, approximately 12 inches aft of the access door.
 TASK 24-31-01-004-001
 2.  Remove the Main Battery_______________________
 A.  Equipment
 (1)  Hoist - Main Battery, B24001-109 or B24001-110
 B.  Access
 (1)  
Location Zones

 (a)  
113 Area forward of NLG wheel well (LH side)

 (b)  
114 Area forward of NLG wheel well (RH side)

 (c)  
211 Control cabin - section 41 (LH side)

 (d)  
212 Control cabin - section 41 (RH side)

 (2)  
Access Panels

 (a)  113AL Forward equipment center access
 C.  Prepare for Removal (Fig. 401)
 S 864-025
 CAUTION: THE MAIN BATTERY MAY BE REMOVED WHILE THE AIRPLANE IS SUPPLIED
_______ WITH EXTERNAL POWER. DO NOT REMOVE THE MAIN BATTERY IF THE AIRPLANE IS SUPPLIED WITH APU OR IDG POWER. THE APU OR IDG WILL SHUTDOWN WHEN THE BATTERY IS REMOVED.
 (1)  If the external power is not necessary, do these steps to remove the external power:
 (a)  
Remove the external power (AMM 24-22-00/201).

 (b)  
Make sure the BAT switch (P5) is in the OFF position.

 S 864-026
 (2)  If the external power is necessary, do these steps before you remove the battery:
 (a)  
Push the BAT switch (P5) to the OFF position.

 CAUTION:_______OPEN THE CIRCUIT BREAKERS IN THE SEQUENCE SHOWN. IF YOU DO NOT OPEN THE CIRCUIT BREAKERS IN THIS SEQUENCE DAMAGE TO THE BATTERY CHARGER CAN OCCUR.

 (b)  
Open this circuit breaker on the right miscellaneous electrical equipment panel (P37) and attach a DO-NOT-CLOSE tag: 1) 37B2, MAIN BATTERY CHARGER

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A

757 MAINTENANCE MANUAL
M223 - MAIN BATTERY SEE A
FWD EQUIPMENT AREA
BATTERY MOUNTING SCREWS (3 PLACES, 3
POST  PLACES OPPOSITE SIDE) BRACKET
SUPPORT LEGS
BATTERY HOIST - FOLDED 
A B 
Main Battery Installation 
Figure 401 

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757
MAINTENANCE MANUAL

 (c)  Open these circuit breakers on the main power distribution panel (P6) and attach a DO-NOT-CLOSE tag: 1) 6D2, BAT XFR CONT 2) 6L8, MAIN BAT CHGR 3) 6L9, HOT BAT BUS 4) 6L12, CENTER BUS DC 5) 6F6, LANDING GEAR ALTN EXT MOTOR 6) AIRPLANES WITH EXTENDED STANDBY POWER;
 6L7, APU/MAIN BAT TIE
 D. Remove the Main Battery
 S 024-018
 (1)  Do these steps to remove the main battery:
 (a)  
Disconnect the main battery connector from the main battery.

 (b)  
Disconnect the thermal sensor connector from the main battery.

 (c)  
Remove the screws that hold the main battery.

 (d)  
Open the main battery hoist.

 (e)  
Lock the battery hoist in the open position with the equipment that is attached.

 (f)  
Put the post of the battery hoist into the bracket.

 (g)  
Connect the support legs of the battery hoist to the structure with the bolts and ball lock pins.
　
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