26-21-03
ALL ú ú 01 Page 603 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
S 436-052
WARNING: PUT THE PROTECTIVE COVERS ON THE FIRE BOTTLE
_______ SQUIBS. IF YOU DO NOT PUT THE PROTECTIVE COVERS ON THE FIRE BOTTLE SQUIBS, THE FIRE BOTTLES CAN RELEASE ITS CONTENTS SUDDENLY AND CAUSE INJURY TO PERSONS.
CAUTION:_______DO NOT PUT SHUNT PLUGS ON THE FIRE BOTTLE SQUIBS. THE SHUNT PLUGS CAN CAUSE DAMAGE TO THE SQUIB PINS.
(4) Put the protective covers on all the fire bottle squibs.
F. Fire Switch Discharge Circuit Test
S 716-055
CAUTION: DO NOT TURN THE FIRE HANDLE WHEN YOU PULL IT INTO THE EMERGENCY
_______ FIRE POSITION. IF YOU TURN THE FIRE HANDLE THE CONTENTS OF THE FIRE BOTTLE CAN BE LET OUT.
(1) Do the operational test that follows:
(a) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel: 1) 6H1, FIRE EXTINGUISHING ENG L BTL 1 2) 6H2, FIRE EXTINGUISHING ENG L BTL 2 3) 6H3, FIRE EXTINGUISHING ENG R BTL 1 4) 6H4, FIRE EXTINGUISHING ENG R BTL 2
S 986-085
(2)
On the control stand panel, P10, set the L and R FUEL CONTROL switches to the RUN position.
S 866-086
(3)
Set the LOAD CHECK switch on the squib test box to the OFF position.
S 486-027
(4)
Attach the adapter cable to the connector on the squib test box.
NOTE: Adapter cables are included with the squib test box and
____ the appropriate adapter cable must be attached to match the electrical connectors from the squibs.
S 426-056
WARNING: DO NOT INSTALL THE ELECTRICAL CONNECTORS TO THE BOTTLE SQUIBS
_______ DURING THE TEST. IF THE BOTTLE IS ACCIDENTALLY FIRED, INJURY CAN OCCUR.
(5) Connect the bottle 1 left engine squib connector, D2188, to the squib test box adapter cable.
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26-21-03
ALL ú ú 01 Page 604 ú Sep 28/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 486-087
(6) Connect the multimeter to the squib test box.
S 866-088
(7) Set the LOAD CHECK switch on the squib test box to the ON position.
S 866-089
(8) On the ENGINE FIRE Control Panel, P8, pull the LEFT engine fire
handle out to the emergency fire position.
NOTE:____ When you pull the fire handles into the emergency fire
position, it is necessary to use the manual fire override
switch behind the fire handle. When you turn the fire
handles, it is necessary to hold the handles against the
stops while the voltage is measured.
(a) Make sure the EICAS message, L ENG SHUTDOWN, shows on the top
display.
(b) Make sure the BOTTLE DISCHARGE light on the squib test box
stays off.
(c) Make sure the multimeter on the squib test box shows 0 |2
volts.
S 866-090
(9) Turn and hold the LEFT engine fire handle fully counterclockwise to the DISCH 1 position.
(a)
Make sure the BOTTLE DISCHARGE light on the squib test box comes on.
(b)
Make sure the multimeter on the squib test box shows 16 volts minimum.
NOTE: If voltage is less than 16 volts, the circuit may not
____ give sufficient current to fire the squib.
S 866-091
(10) Open this circuit breaker on the P6 panel:
(a) 6H1, FIRE EXTINGUISHING ENG L BTL 1
S 216-092
(11)
Make sure the BOTTLE DISCHARGE light on the squib test box goes off.
S 216-093
(12)
Make sure the multimeter on the squib test box shows 0 |2 volts.
S 866-094
(13)
Close this circuit breaker on the P6 panel:
(a) 6H1, FIRE EXTINGUISHING ENG L BTL 1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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