757
MAINTENANCE MANUAL

 (3)  S 866-253Make sure these circuit breakers on the P37 panel are closed: (a) 37J5, RECIRC FAN R
 (4)  S 866-316Open these circuit breakers on the main power distribution panel, P6, and attach DO-NOT-CLOSE tags: (a) 6H5, FIRE EXTINGUISHING CARGO BTL 1 (b) 6H6, FIRE EXTINGUISHING CARGO BTL 2
 (5)  S 716-254Make sure the ground air is not in operation.
 (6)  S 746-255Make sure the L and R PACK selectors on the P5 panel are in the OFF position.
 (7)  S 866-256Push the L and R RECIRC FAN switches on the P5 panel to the on position. (a) Make sure the ON lights in the L and R RECIRC FAN switches come on.

 S 716-258
 (8)  
Listen for the fan noise or feel for the air flow at any passenger cabin conditioned air outlet to make sure the fan operates.

 S 866-259

 (9)  
Push the AFT Cargo Fire switch on the APU/CARGO Fire Control Panel, P8.

 (a)  
Make sure the AFT ARMED switchlight is ON.

 (b)  
Make sure the L RECIRC FAN INOP light does not come on.

 (c)  
Make sure the R RECIRC FAN INOP light comes on.

 (d)  
Make sure the EICAS message, R RECIRC FAN, shows on the top display.

 S 866-264
 (10) Push the AFT Cargo Fire switch and release.
 (a)  
Make sure the AFT ARMED switchlight is OFF.

 (b)  
Make sure the R RECIRC FAN INOP light goes off.

 (c)  
Make sure the EICAS message, R RECIRC FAN, does not show on the top display.

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757 MAINTENANCE MANUAL
 S 866-268
 (11) Push the L and R RECIRC FAN switches to the off positions.
 (a) Make sure the L and R RECIRC FAN INOP lights come on.
 S 866-317
 (12) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel:
 (a)
6H5, FIRE EXTINGUISHING CARGO BTL 1

 (b)
6H6, FIRE EXTINGUISHING CARGO BTL 2

 B. Put the Airplane Back to Its Usual Condition
 S 866-270
 (1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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2.

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757 MAINTENANCE MANUAL
 CARGO COMPARTMENT FIRE EXTINGUISHER BOTTLE/DISCHARGE CARTRIDGE -
________________________________________________________________
 REMOVAL/INSTALLATION

____________________
General
_______
 A.  Two cargo fire extinguisher bottles are in the lower aft cargo compartment, forward of the aft cargo compartment forward endliner panel. Each fire extinguisher bottle has two discharge cartridges (squibs).
 B.  The removal/installation procedure contains four tasks. The first two tasks remove and install the discharge cartridge from the cargo fire extinguisher bottle. The last two tasks remove and install the cargo fire extinguisher bottle.
 C.  The removal/installation procedure is the same for both bottles and their squibs.
 TASK 26-23-02-024-019
Remove the Cargo Fire Extinguisher Bottle Discharge Cartridge (Squib)

_____________________________________________________________

 A.  General
 (1)  This task gives the instructions to remove the discharge cartridge from the cargo fire extinguisher bottle.
 B.  Equipment
 (1)  Squib Protective Cover
 M83723/60-210-AN or AC
M83723/60-110-AN or AC

Industrial Automation Inc.
1421 South 93rd Street
Seattle, WA 98108
Attn: Byron Woolsey
Tel: (206) 763-1025

 C.  Reference
 (1)  
AMM 24-22-00/201, Electrical Power - Control
　
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