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 (27) Set and hold the EXT TEST switch on the P8-1 panel to position 1.
 (a)  Make sure that only these lights on the P8-1 panel come on: 1) R (green) 2) L (green) 3) APU (green)
 S 864-047
 (28) Release the EXT TEST switch.
 (a)  Make sure all the lights on the P8-1 panel go off.
 S 864-048
 (29) Set and hold the EXT TEST switch on the P8-1 panel in position 2.
 (a)  Make sure that only these lights on the P8-1 panel come on: 1) R (green)
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737-300/400/500MAINTENANCE MANUAL
 2) L (green)
 3) APU (green)

 S 864-049
 (30) Release the EXT TEST switch.
 (a) Make sure all lights on the P8-1 panel go off.
 E. Put the Airplane Back to Its Usual Condition
 S 864-057
 (1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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 ENGINE FIRE EXTINGUISHER BOTTLES - INSPECTION/CHECK
___________________________________________________
 1.  General_______
 A.  There are three tasks in this section:
 (1)
Make a check of the fire extinguisher bottle for correct pressure.

 (2)
Weigh the fire extinguisher bottle.

 (3)
Make a check of the discharge cartridge.

 B.  You will use the pressure check and the weight check to find if the fire extinguisher bottle is serviceable.
 TASK 26-21-11-786-002
 2.  Engine Fire Extinguisher Bottle Pressure Check (Fig. 601)_________________________________________________________

-60  -40  -20  0  20  40  60  80  100  120  140 
(-51)  (-40)  (-29)  (-18)  (-7)  (4)  (16)  (27)  (38)  (49)  (60) 
BOTTLE TEMPERATURE - `F (`C) 

Engine Fire Extinguisher Bottle Pressure - Temperature Curve
Figure 601

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 A. Special Tools and Equipment
 (1)  
Infrared Thermometer - Wahl Instruments Inc. Model IRT-50E

 (2)  
Surface Probe - Wahl Instruments Inc. Model TC869 with 2500MX LCD meter (for use in temperatures below 0 deg F)

 B. Access
 (1)  Location Zones
 216 Left Main Wheel Well

 C. Procedure
 S 786-001
 (1)  Measure the pressure in the fire extinguisher bottle (referred to as the fire bottle).
 (a)  
Permit the bottle to get ambient temperature and use ambient temperature to find the pressure.

 (b)  
Alternative method: Measure the temperature of the fire bottle with the infrared thermometer.

 (c)  
Find the higher pressure limit and the lower pressure limit from the fire bottle temperature that was measured and Fig. 601.

 (d)  
Read the pressure gage on the fire bottle.

 (e)  
Compare the pressure in the fire bottle (read from the gauge) with the higher and lower pressure limits.

 (f)  
Make sure the pressure in the fire bottle is more than the lower limit.

 (g)  
Make sure the pressure in the fire bottle is less than the higher limit. 1) If the pressure in the fire bottle is more than the higher

 limit, or less than the lower limit, replace the fire bottle with a serviceable fire bottle.
　
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