(15)
 Make sure bit 16 (engine 1 fire loop B) on the CMC input monitoring is set to zero.

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A
747-400 MAINTENANCE MANUAL
 S 025-082
 (16)
 Disconnect connector DT681B (upper aft fire detector loop B) at engine 1 (left side).

 S 425-083

 (17)
 Install a jumper wire in loop B between the center pin of the connector, DT681B, and the connector shell of the fire detector element, T681.

 S 865-084

 (18)
 Make sure bit 16 on CMC input monitoring is set to one.

 S 865-085

 (19)
 Make sure the EICAS advisory indication "DET FIRE/OVHT 1" shows.

 S 025-086

 (20)
 Remove the jumper wire from loop A and B.

 S 865-198

 (21)
 Make sure bit 16 on the CMC input monitoring is set to zero.

 S 425-088

 (22)
 Install a jumper wire in loop B between the center pin and the connector shell of the fire detector element, T681.

 S 865-199

 (23)
 Make sure bit 16 on the CMC input monitoring is set to one.

 S 025-090

 (24)
 Remove the jumper wire from loop B.

 S 865-091

 (25)
 Set the fuel control switch for engine 1 in the "RUN" position.

 S 865-092

 (26)
 Make sure the engine 1 fire handle (M7326) is in the locked position.

 S 425-093

 (27)
 Install a 300 ohm resistor in loop B between the center pin of the connector, DT681B, and the connector shell of the fire detector element, T681.

 NOTE: Keep the resistor in position for the subsequent step.
____
 S 425-094
 (28) Install a jumper wire in loop B between the center pin of the connector, DT681B, and the connector shell of the fire detector element, T681.
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747-400 MAINTENANCE MANUAL
 S 865-095
 (29)
 Make sure the warning EICAS message "FIRE ENG 1" shows.

 S 865-096

 (30)
 Make sure the fuel control switch for engine 1, below the thrust levers, comes on.

 S 865-097

 (31)
 Make sure you hear the aural warning bell.

 S 865-098

 (32)
 Make sure the engine 1 fire handle comes on.

 S 865-136

 (33)
 Pull the engine 1 fire handle out to the emergency fire position.

 S 865-100

 (34)
 Make sure you continue to hear the aural alarm.

 S 865-101

 (35)
 Make sure the engine 1 fire handle stays on.

 S 865-102

 (36)
 Push the fire handle into its usual position.

 S 025-103

 (37)
 Remove the jumper wire and resistor from loop B.

 S 865-104

 (38)
 Make sure the warning EICAS message "FIRE ENG 1" does not show.

 S 865-105

 (39)
 Make sure the fuel control switch light for engine 1 goes off.

 S 865-117

 (40)
 Make sure the engine 1 fire handle light goes off.

 S 865-107

 (41)
 Make sure you do not hear the aural warning.

 S 425-108

 (42)
 Connect connector DT681B (loop B) to fire detector element T681 and tighten it to 50 to 70 pound-inches(5.6 - 7.9 newton-meters).

 WARNING:_______ 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 WILL BE LET OUT AND INJURY TO PERSONS CAN OCCUR.

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