26-21-00
 ALL  ú ú 02 Page 511 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-047
 (19) Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6, Main Power Distribution Panel
 1) 6H1, FIRE EXTINGUISHER ENG 1&3 B
 2) 6H2, FIRE EXTINGUISHER ENG 1&3 A
 3) 6H3, FIRE EXTINGUISHER ENG 2&4 B
 4) 6H4, FIRE EXTINGUISHER ENG 2&4 A

 S 435-236
 (20) Connect the electrical connectors, DM228, DM229, DM230, and DM231.
 NOTE: Do this procedure each time you connect an
____
 electrical connector to a fire bottle squib.

 (a)  Remove the 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: Connect a 10 kohm resistor across the meter to
____ remove any 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: These steps 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 electrical 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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 26-21-00
 ALL  ú ú 02 Page 512 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 865-049
 (21) Close these circuit breakers and remove the DO-NOT-CLOSE tags:
 (a)  P6, Main power Distribution Panel
 1) 6H1, FIRE EXTINGUISHER ENG 1&3 B
 2) 6H2, FIRE EXTINGUISHER ENG 1&3 A
 3) 6H3, FIRE EXTINGUISHER ENG 2&4 B
 4) 6H4, FIRE EXTINGUISHER ENG 2&4 A

 G. Put the Airplane back to its usual condition.
 S 015-254
 WARNING:_______REFER TO AMM 27-81-00/201 FOR THE LOCK REMOVAL PROCEDURES. THE FLAPS WILL RETRACT IN SEVEN SECONDS AND CAN INJURE PERSONNEL.
 (1)  Remove the safety locks for the leading edge flap
 (AMM 27-81-00/201).

 S 015-255
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (2)  Retract the leading edge flaps (AMM 27-81-00/201).
 TASK 26-21-00-735-245
 4.  Tubing System Test__________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-81-00/201, Leading Edge Flap System

 B. Equipment
 (1)  Pressure Cap (plug) - AN929-8
 C. Access
 (1)  Location Zone
 221 Control Cabin LH
 222 Control Cabin RH
 514 Krueger Flap No.1, Left
 614 Krueger Flap No.1, Right

 D. Prepare for the Tests
 S 845-246
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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