E. Prepare for Test
 S 865-161
 (1)  Open these circuit breakers on the P6 panel and attach DO-NOT-CLOSE tags:
 (a)  
6H1, FIRE EXTINGUISHING ENG L BTL 1

 (b)  
6H2, FIRE EXTINGUISHING ENG L BTL 2

 (c)  
6H3, FIRE EXTINGUISHING ENG R BTL 1

 (d)  
6H4, FIRE EXTINGUISHING ENG R BTL 2

 F. Test Fire Extinguisher Discharge Lines (Figure 502)
 S 435-071
 (1)  
On the left and right engine struts, cap the nozzles (2) with the clamp or plug from the test equipment (figure 502).

 S 025-072

 (2)  
Disconnect the left engine discharge line at bottle 1.

 S 485-073

 (3)  
Install the regulator from the test equipment, and pressure gage to the discharge line.

 (4)  
Disconnect the left engine discharge line at bottle 2.

 (5)  
Install the plug in the bottle 2 discharge line.

 S 025-074
 S 025-225
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757
MAINTENANCE MANUAL

PRESSURE 
GAGE 
REGULATOR
ASSEMBLY 
TO AIR 
TO AIR  SUPPLY 
SUPPLY 
ASSEMBLY REGULATOR  PLUG  GAGE PRESSURE 
PLUG 

FIRE BOTTLES
LEFT ENGINE TEST  RIGHT ENGINE TEST
(AFT CARGO COMPARTMENT)
SEE  A 
ENGINE AND STRUT  CLAMP AND 
(LEFT OR RIGHT)  PLUG ASSEMBLY 
A 
Pressure Test Setup 
Figure 502 

G02788
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757 MAINTENANCE MANUAL
 S 485-075
 (6)  Connect the dry air source to the regulator.
 S 785-206
 CAUTION:_______APPLY PRESSURE ONLY TO TUBING. DO NOT PRESSURIZE THE FIRE BOTTLES. DAMAGE TO DISCHARGE PORTS CAN OCCUR.
 (7)  
Apply 50 |5 psig pressure to the left engine discharge line until the air pressure becomes stable.

 S 785-077

 (8)  
Isolate the air pressure supply from the left engine discharge line.

 S 785-078

 (9)  
After 2 minutes, make sure that the left engine discharge line pressure does not decrease more than 1 psig.

 S 785-079

 (10)
 Release the air pressure from the regulator.

 S 865-162

 (11)
 Remove the regulator and plug, and connect the left engine discharge lines to fire bottles 1 and 2.

 S 085-226

 (12)
 Remove the clamp or plug from the distribution nozzles.

 S 785-080

 (13)
 Do the above steps again for the right engine discharge line.

 S 435-086

 (14)
 Connect the right engine discharge lines to fire bottles 1 and 2.

 G. Put the Airplane Back to Its Usual Condition.
 S 865-082
 (1)  Make sure these circuit breakers on the P6 panel are closed:
 (a)  
6H1, FIRE EXTINGUISHING ENG L BTL 1

 (b)  
6H2, FIRE EXTINGUISHING ENG L BTL 2

 (c)  
6H3, FIRE EXTINGUISHING ENG R BTL 1

 (d)  
6H4, FIRE EXTINGUISHING ENG R BTL 2

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 ALL  ú ú 02 Page 519 ú Sep 28/01
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A

757
MAINTENANCE MANUAL

 ENGINE FIRE EXTINGUISHER BOTTLE/DISCHARGE CARTRIDGE - REMOVAL/INSTALLATION
　
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