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747-400 MAINTENANCE MANUAL
 S 865-119
 (43)
 Make sure the EICAS message "ENG FIRE 1 LP A" continues to show.

 S 025-110

 (44)
 Remove the jumper wire from loop A.

 S 425-111

 (45)
 Connect connector DT681D (loop A) to the fire detector element, T681 and tighten it to 50 to 70 pound-inches(5.6 - 7.9 newton-meters).

 S 865-112

 (46)
 Make sure the EICAS message "ENG FIRE 1 LP A" does not show.

 S 865-113

 (47)
 If the test is necessary for engines 2, 3, or 4, do the test again one engine at a time.

 S 865-114

 (48)
 Make sure these conditions occur when you do the test on engine 2,

 3, or 4: CMC INPUT MONITORING
 ~.................................................................. | ENGINE | EICAS MESSAGE | LOOP A (BIT) | LOOP B (BIT) | .................................................................... | 2 | FIRE ENG 2 | 17 | 18 | .................................................................... | 3 | FIRE ENG 3 | 19 | 20 | .................................................................... | 4 | FIRE ENG 4 | 21 | 22 | 2...........…...................….................…................1
 F.  AIRPLANES WITH WALTER KIDDE FIRE PROTECTION SYSTEM; Engine Overheat Detection Indication System Test
 S 865-116
 (1)  
Push and hold the FIRE/OVHT TEST switch on the miscellaneous switching panel (P5).

 S 845-107

 (2)  
Make sure these EICAS messages do not show:

 (a)  
DET FIRE/OVHT 1

 (b)  
DET FIRE/OVHT 2

 (c)  
DET FIRE/OVHT 3

 (d)  
DET FIRE/OVHT 4

 (3)  
Push the LSK next to <OTHER FUNCTIONS" on the CMC main menu.

 (4)  
Press the LSK next to <INPUT MONITORING.

 S 865-108
 S 865-118
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (5)  S 865-110TO MONITOR THE ENGINE 1 OR 2 INPUT TO THE EIU; Write in "E/034/270/00"
 (6)  S 865-131TO MONITOR THE ENGINE 3 OR 4 INPUT TO THE EIU; Write in "E/034/271/00"
 (7)  S 865-111Push the LSK next to "-/--/---/--".
 (8)  S 745-112Makes sure bit 23 is set to zero.
 (9)  S 035-113Disconnect connector DT684A (upper forward overheat detector loop A) at engine 1 (left side).
 S 485-114

 (10)
 Install a jumper wire in loop A between the center pin of connector, DT684A, and the connector shell of the overheat detector element, T684.

 S 745-115

 (11)
 Make sure bit 23 on the CMC input monitoring is set to one.

 S 085-116

 (12)
 Remove the jumper wire from loop A.

 S 745-117

 (13)
 Make sure bit 23 on the CMC input monitoring is set to zero.

 S 485-118

 (14)
 Install a jumper wire in loop A between the center pin and the connector shell of the overheat detector element, T684.

 NOTE: Keep the loop A jumper wire connected.
____
 S 745-119
 (15)
 Make sure bit 23 on the CMC input monitoring is set to one.

 S 745-077

 (16)
 Make sure bit 24 (engine 1 overheat loop B) on the CMC input monitoring is set to zero.

 S 035-121

 (17)
 Disconnect connector DT684C (upper forward overheat detector loop B) at engine 1 (left side).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 485-122
　
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