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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-319
(21) Repeat the Cargo Fire Extinguisher Squib Discharge Test procedure for each bottle A squib aft, B forward, B aft, C forward, C aft, and D forward and D aft.
~..............................................
| SQUIB | ELECTRICAL CONNECTOR |
................................................
| BOTTLE A AFT | DM7906C |
................................................
| BOTTLE B FORWARD | DM7907B |
................................................
| BOTTLE B AFT | DM7907C |
................................................
| BOTTLE C FORWARD | DM7908B |
................................................
| BOTTLE C AFT | DM7908C |
................................................
| BOTTLE D FORWARD | DM6742B |
................................................
| BOTTLE D AFT | DM6742C |
2...................…..........................1
NOTE: To bypass the 30-minute time delay relay, before the bottle C
____ and D discharge circuit test, make sure the system is in the GROUND Mode (AMM 32-09-02/201).
S 865-283
(22)
Do the System Test - Time Delay Relay Test (AMM 26-23-05/601).
G.
Squib Electrical Connection Procedure
NOTE: Do this procedure each time you connect an electrical connector to
____
a fire bottle squib.
S 865-304
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 BOTTLE TO RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Before you touch the squib, do the procedure for devices that are sensitive to electrostatic discharge (AMM 20-41-02/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 435-237
(2) Do the steps that follow to connect an electrical connector to a fire bottle squib.
(a) Remove the test equipment protective cover from the fire bottle squib.
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: If you use a voltmeter with a 10k ohm or greater
____ resistor, you will remove the stray voltage from the electrical connector.
(c)
Make sure the squib electrical pins are not bent or damaged.
(d)
Make sure the electrical connector is not damaged.
NOTE: If the squib electrical pins do not enter the
____ receptacles in the electrical connector, the pins can cause damage to the electrical connector.
(e)
Connect the electrical connector to the fire bottle squib.
(f)
Do the steps that follow to make sure you did not bend or damaged the squib pins.
NOTE: This step is necessary because the pins are most likely
____ to be damaged the first time an electrical connector is connected to the squib.
1) Disconnect the electrical connector from the fire bottle squib.
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