S 735-101
(25)
Make sure 0 volts dc shows between the pins 1 and 2 of the connector DM103B.
S 865-102
(26)
Stop for 10 seconds.
S 735-103
(27)
Make sure 0 volts dc shows between the pins 1 and 2 of the connector DM103B.
S 865-104
(28)
Release the FIRE/OVHT TEST switch.
S 865-107
(29)
Open the circuit breaker APU START on the P83 panel.
S 865-108
(30)
Remove the RLY-APU 95% SPEED relay, R7715, from the P83 panel.
S 485-109
(31)
Connect a jumper from the pin 14 of the connector DR7715 to ground.
S 865-110
(32)
Push and hold the FIRE/OVHT TEST switch on the miscellaneous switching module, M7317 (P5).
(33)
Stop for 10 seconds.
S 735-113
(34)
Make sure 24 to 32 volts dc shows between the pins 1 and 2 of the connector DM103B.
(35)
Release the FIRE/OVHT TEST switch.
S 865-112
S 865-114
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747-400 MAINTENANCE MANUAL
S 085-116
(36)
Remove the jumper that is between the pin 14 of the connector DR7715 and ground.
S 865-117
(37)
Install the RLY-APU 95% SPEED relay, R7715, removed from the P83 panel.
S 865-144
(38)
Close the circuit breaker APU START on the P83 panel.
S 865-118
(39)
Put the APU FIRE CONTROL handle back to its usual position.
S 085-133
(40)
Remove the voltmeter at the connector DM103B.
I.
Put the Airplane Back to Its Usual Condition
S 865-060
(1) Open these circuit breakers on the main power distribution panel, P6, and attach DO-NOT-CLOSE tags:
(a)
6H5, FIRE EXTINGUISHER APU
(b)
6L4, FLIGHT DECK LIGHT CAPT IND
S 485-139
(2) Do the steps that follow to connect an electrical connector DM103B to a fire bottle squib.
S 865-221
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.
(3) Before you touch the squib, do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).
(a) Remove the protective cover from the fire bottle squib.
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747-400
MAINTENANCE MANUAL
WARNING:_______ MAKE SURE THERE IS NO VOLTAGE AT THE ELECTRICAL CONNECTOR. IF THERE IS A VOLTAGE AT THE ELECTRICAL CONNECTOR, THE SQUIB CAN RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.
(b) Make sure there is no voltage between pins 1 and 2 of the electrical connector.
NOTE:____ Connect a 10 Kohm resistor across the meter to remove any stray voltage from the electrical connector.
(c) (d) Make sure the squib pins are not bent or damaged.Make sure the electrical connector is not damaged.
NOTE:____ The squib pins can cause damage to the electrical connector if the pins do not enter the connector receptacles.
(e) (f) Connect the electrical connector to the fire bottle squib.Do the steps that follow to make sure you did not bend or damage the squib pins.
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