NOTE: You must use the manual unlock button behind the fire
____ handle to move it into the emergency position. You must hold the handle against the stops while you turn it and write the values.
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 (6)  S 865-027Turn and hold the APU fire handle clockwise until it stops.
 (7)  S 755-026Make sure the BOTTLE DISCHARGE light on the test box is on.
 (8)  S 755-025Write the voltage value on the multimeter as (V1).
 (9)  S 865-028Move the switch on the test box to ON.
 S 755-029

 (10)
 Write the voltage value on the multimeter as (V2).

 S 865-030

 (11)
 Release the handle and make sure it moves 10 degrees to the center.

 S 755-031

 (12)
 Make sure the voltmeter shows 0 |2 volts.

 S 865-032

 (13)
 Move the switch on the test box to OFF.

 S 975-033

 (14)
 Calculate the resistance Rc of the squib discharge circuit using this formula:

 Rc = RL (V1/V2) - RL
 S 755-034
 (15) Make sure Rc is equal to or less than 3 ohms.
 NOTE: If Rc is more than the maximum permitted 3 ohms, the
____ circuit cannot supply sufficient current to fire the squib.
 S 865-035
 (16) Turn and hold the APU fire handle fully counterclockwise.
 (a)  Do steps (7) thru (15) again to make sure there is sufficient current to fire the squib with a counterclockwise turn of the APU fire handle.
 S 865-036
 (17)
 Move the APU fire handle to the center fully latched position.

 S 865-037

 (18)
 Pull down the APU fire control handle on the P28 panel, found in the main wheel well.

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 S 865-038
 (19)
 Turn on the BOTTLE DISCHARGE SWITCH.  Make sure the light on the test box goes on while the discharge switch is on.

 S 975-039

 (20)
 Write the voltage value on the multimeter as (V1).

 S 865-040

 (21)
 Turn the switch on the test box to ON.

 S 975-041

 (22)
 Write the voltage value on the multimeter as (V2).

 S 865-042

 (23)
 Release the BOTTLE DISCHARGE SWITCH and make sure the multimeter goes back to 0 |2 volts.

 S 865-043

 (24)
 Turn the switch on the test box to OFF.

 S 975-044

 (25)
 Calculate the resistance Rc of the squib discharge circuit using this formula:

 Rc = RL (V1/V2) - RL
 S 755-045
 (26) Make sure Rc is equal to or less than 5 ohms.
 NOTE:  If Rc is larger than the maximum permitted 5 ohms, the circuit cannot supply sufficient current to fire the squib.
 F. Put the Airplane to its usual condition.
 S 415-087
 (1)  
Install a copper lockwire, MS20995CY15 on the discharge switch on the APU remote fire panel.

 S 865-046

 (2)  
Open the circuit breaker for the EXTINGUISHER BOTTLES APU and attach a DO-NOT-CLOSE tag.

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 S 865-077
 WARNING:_______ DO NOT TOUCH THE SQUIB BEFORE YOU DO THE PROCEDURES FOR DEVICES
 THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE.  ELECTROSTATIC
　
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