2.........…..........…............…..............…................1
S 864-131
(17) Open these circuit breakers:
(a) P6 Main Power Distribution Panel 1) 6H1 FIRE EXTINGUISHER ENG 1&3 B 2) 6H2 FIRE EXTINGUISHER ENG 1&3 A
S 434-132
(18) Connect electrical connectors DM228 and DM229.
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.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
NOTE: Connect a 10 kohm resistor across the meter to remove
____ any stray voltage from the electrical connector.
S 864-362
(19) Push and hold the manual override pressure switch, or insert the hex key into the bottle pressure switch cam and turn the key with a maximum of 5.7 pound-inch on the left bottle.
(a) Make sure the Bottle A discharge ENG 1&2 light on the P5 panel comes on.
S 864-363
(20) Push and hold the manual override pressure switch, or insert the hex key into the bottle pressure switch cam and turn the key with a maximum of 5.7 pound-inch on the right bottle.
(a) Make sure the Bottle B discharge ENG 1&2 light on the P5 panel comes on.
S 864-364
(21)
Release the manual override pressure switch, or the hex key.
S 764-134
(22)
Repeat the squib circuit test for the right wing fire bottles with the data shown in the table:
~................................................................. | | | ELECTRICAL| | FIRE HANDLE | | WING | BOTTLE | CONNECTOR | SQUIB | ROTATION | ...................................................................
| RIGHT | A | DM230B | ENGINE 3 |COUNTERCLOCKWISE|
| | | DM230C | ENGINE 4 |CLOCKWISE |
| | B | DM231B | ENGINE 3 |CLOCKWISE |
| | | DM231C | ENGINE 4 |COUNTERCLOCKWISE|
2.........…..........…............…..............…................1
S 864-139
(23) Open these circuit breakers:
(a) P6 Main Power Distribution Panel 1) 6H3 FIRE EXTINGUISHER ENG 2&4 B 2) 6H4 FIRE EXTINGUISHER ENG 2&4 A
S 434-140
(24) Connect electrical connectors DM230 and DM231.
NOTE: Do this procedure each time you connect an electrical
____ connector to a fire bottle squib.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-21-01
ALL ú ú 02 Page 414 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(a)
Remove the protective cover from the fire bottle squib.
(b)
Make sure there is no voltage between pins 1 and 2 of the electrical connector.
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.
NOTE: Connect a 10 kohm resistor across the meter to remove
____ any stray voltage from the electrical connector.
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