(b)  
EXTINGUISHER BOTTLES LEFT

 (c)  
EXTINGUISHER BOTTLE RIGHT

 (d)  
EXTINGUISHER BOTTLE LEFT

 S 865-097
 (21)
 Set and hold the EXT TEST switch on the P8-1 panel to 1.

 S 755-098

 (22)
 Make sure only these lights on the P8-1 panel come on:

 (a)  
R (green)

 (b)  
L (green)

 (c)  
APU (green)

 S 865-099
 (23)
 Release the EXT TEST switch.

 S 865-100

 (24)
 Set and hold the EXT TEST switch on the P8-1 panel to position 2.

 S 755-101

 (25)
 Make sure these lights on the P8-1 panel are come on:

 (a)  
R (green)

 (b)  
L (green)

 (c)  
APU (green)

 (26)
 Release the EXT TEST switch.

 (27)
 Make sure all lights on the P8-1 panel do not come on.

 (28)
 Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 865-102
 S 755-103
 S 865-104
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 26-21-00-725-105
 4.  Tubing Leakage Test___________________
 A. Consumable Materials
 (1)  Source of dry compressed air, capable of
 regulating to 35 |5 psig

 B. Equipment
 (1) Engine Fire Extinguishing System Test Equipment - C26004-8
 C. References
 (1)  AMM 24-22-00/201, Power - Control
 D. Access
 (1)  Location Zone
 101, 102 Control Cabin

 E. Prepare for the Test
 S 935-106
 (1)  
Put a mark on all four bottle discharge lines to use when you install the lines after the test.

 S 865-109

 (2)
Disconnect the four bottle discharge lines at the bottles.

 S 865-110

 (3)
Seal the forward fairing discharge lines with these steps

 (a)  
Open the fan cowls.

 (b)  
Seal the discharge nozzles with the test equipment plugs.

 S 865-111
 (4)  Seal the core discharge line with these steps.
 (a)  
Open the left fan duct cowl and thrust reverser half (AMM 78-31-00/201).

 (b)  
Seal discharge nozzles with the test equipment plugs.

 S 865-112
 (5)  
Connect the right hose from one bottle to the left hose from the same bottle.

 (6)
Seal one of the two hoses and keep the other one open.

 S 865-114

 (7)
Connect the supply of compressed air to the open hose.

 S 865-113
 F. Do the test to find the leaks
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 03 Page 513 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 785-115
 CAUTION:_______APPLY PRESSURE ONLY TO TUBING. DO NOT PRESSURIZE THE FIRE BOTTLE. DAMAGE TO THE DISCHARGE PORTS CAN OCCUR.
 (1)  
Apply 35 |5 psig to the discharge line.

 S 915-117

 (2)  
Permit a minimum of 3 minutes for the air pressure in the fire extinguisher tubes to become stable.

 S 785-118

 (3)  
Isolate the air pressure source from the fire extinguisher tubes.

 S 785-119

 (4)  
Make sure that after 2 minutes the pressure does not decrease by more than 1 psi.

 S 085-120

 (5)
Release the air pressure and disconnect the air source.

 G. Put the Airplane back to its usual condition.
 S 085-121
 (1)  
Remove all plugs and caps installed on the fire extinguisher nozzles.
　
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