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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