S 865-141
(19)
Put the toggle switch on the squib circuit test box to the OFF position.
S 865-143
(20)
Turn and hold the APU fire handle fully clockwise.
S 735-144
(21)
Make sure the APU BTL DISCH light on the squib circuit test box is on.
S 975-145
(22)
Measure and make a record of the voltage on the multimeter (V1).
S 865-146
(23)
Put the toggle switch on the squib circuit test box to the ON position.
S 975-147
(24)
Make a record of the voltage on the multimeter (V2).
S 865-148
(25)
Release the APU fire handle.
(a) Make sure the handle moves quickly to in 10 degrees or less of the center position.
(26)
Make sure the multimeter shows 0 | 2 volts.
(27)
Turn the handle to the horizontal position.
(28)
Push in the fire handle to the usual position.
S 865-046
(29)
Put the toggle switch on the squib circuit test box to the OFF position.
S 735-149
S 865-150
S 865-138
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
S 015-047
(30)
Get access to the fire shutdown module for the APU, M869, which is installed in the right wheel well for the main landing gear.
S 865-048
(31)
Pull the fire control handle on the fire shutdown module for the APU, M869.
S 735-049
(32)
Make sure the APU BTL DISCH light on the squib circuit test box is off.
S 865-050
(33)
Push and hold the APU EXTINGUISHER DISCHARGE button on the fire shutdown module, M869.
S 735-051
(34)
Make sure the APU BTL DISCH light on the squib circuit test box is on.
S 975-052
(35)
Make a record of the voltage on the multimeter (V1).
S 865-053
(36)
Put the toggle switch on the squib circuit test box to the ON position.
S 975-054
(37)
Make a record of the voltage on the multimeter (V2).
S 865-055
(38)
Release the APU EXTINGUISHER DISCHARGE button on the M869 module.
S 735-056
(39)
Make sure the multimeter shows 0 | 2 volts.
S 735-142
(40)
Make sure the APU BTL DISCH light on the squib circuit test box is off.
(41)
Restore the APU fire control handle to its normal position.
S 865-226
(42)
Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag:
S 865-225
(a) 6H5, FIRE EXTINGUISHER APU
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 485-057
(43)
Remove the squib electrical connector, DM103B, from the squib circuit test box.
S 865-227
(44)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the main power distribution panel, P6:
(a) 6H5, FIRE EXTINGUISHER APU
S 975-058
(45) Calculate the resistance for the squib discharge circuit, RC, with the formula that follows:
RC = RL * (V1/V2) - RL
Make sure the value for RC is less than 3.8 ohms.
NOTE: If RC is more than 3.8 ohms, the circuit can not supply
____
sufficient current to fire the squib.
S 085-074
(46)
Remove the wires from the squib circuit test box.
H.
Do a Fire Simulation Test
S 865-220
WARNING: DO NOT TOUCH THE SQUIB BEFORE YOU DO THE PROCEDURES FOR DEVICES
_______ THAT ARE SENSITIVE TO ELECTROSTATIC DISCHARGE. ELECTROSTATIC DISCHARGE CAN CAUSE THE FIRE BOTTLES TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
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本文链接地址：747-400 AMM 飞机维护手册 防火 FIRE PROTECTION 2(98)
