26-21-04
 ALL  ú ú 06 Page 404 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 B.
C.
D.
E.
A
747-400
MAINTENANCE MANUAL

 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.
 (1)  
Before you touch the squib, do the procedure for devices that are

 sensitive to electrostatic discharge (AMM 20-41-02/201).Special Tools and Equipment

 (1)
17MIT65B04017 - Lock - Drive Unit, Leading Edge FlapStandard Tools and Equipment

 (1)  
Voltmeter - 28 vdc

 (2)  
Resistor - 10 kohm or greater

 (3)
Torque Wrench - Pound-inchReferences

 (1)  
AMM 20-41-02/201, Electrostatic Discharge Sensitive Devices

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 (3)  
AMM 27-81-00/201, Leading Edge Flap System

 (4)  
AIPC 26-21-03, Fig. 1

 (5)  
WDM 26-21-01, WDM 26-21-02, WDM 26-21-03, WDM 26-21-04

 (6)  
Location Zone 514 Krueger Flap No.1, Left 614 Krueger Flap No.1, Right

Squib Electrical Connection Procedure
 NOTE: Do this procedure each time you connect an electrical connector to
____ a fire bottle squib.
 S 434-041
 (1)  Do the steps that follow to connect an electrical connector to a fire bottle squib.
 (a)  If a protective cover is installed, remove the protective cover.
 CAUTION:  IF A SHUNT PLUG IS INSTALLED, PULL THE SHUNT PLUG STRAIGHT
_______ OFF THE FIRE BOTTLE SQUIB. IF YOU TWIST OR WIGGLE THE SHUNT PLUG, YOU CAN CAUSE DAMAGE TO THE SQUIB PINS.
 (b)  If a shunt plug is installed, pull the shunt plug straight off the squib and discard the shunt plug.
 NOTE: Shunt plugs should not be used to cover the fire bottle
____ squibs because they can cause damage to the squib pins.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-21-04
 ALL  ú ú 08 Page 405 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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.
 (c)  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.
 (d)  
Make sure the squib pins are not bent or damaged.

 (e)  
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.
 (f)  
Connect the electrical connector to the fire bottle squib.

 (g)  
Do the steps that follow to make sure you did not bend or damage 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. 2) Make sure the squib pins are not bent or damaged. 3) Make sure the electrical connector is not damaged. 4) Connect the electrical connector to the fire bottle squib.
 F. Procedure
 S 424-048
 (1)
Install the squib and the ground lug assembly in the fire bottle.

 (2)
Tighten the squib assembly to a torque of 90 to 100 pound-inches.

 (3)
Install a lockwire between the squib and the discharge outlet.

 S 214-019

 (4)
Examine the internal surface of the squib electrical connector.
　
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