(10)
Make sure bit 16 (engine 1 fire loop B) on the CMC input monitoring is set to zero.
S 035-150
(11)
Disconnect one of the leads (pin A and pin C) of the fire detector element, TS683, labeled loop B on engine 1 (lower forward 6 o'clock position of the engine core).
S 745-151
(12)
Make sure bit 16 on the CMC input monitoring is set to one.
S 745-152
(13)
Make sure the EICAS message "DET FIRE/OVHT 1" shows.
S 435-153
(14)
Connect the loop A No. 8 and No. 10 terminal studs (pin C and pin A) of the fire detector element, TS683, on engine 1.
(a) Tighten the nuts:
-
No. 8 terminal stud (Pin C): 40 to 45 pound-inches
-
No. 10 terminal stud (Pin A): 50 to 55 pound-inches.
S 435-154
(15) Connect the loop B No. 8 and No. 10 terminal studs (pin C and pin A) of the fire detector element, TS683, on engine 1.
(a) Tighten the nuts:
-
No. 8 terminal stud (Pin C): 40 to 45 pound-inches
-
No. 10 terminal stud (Pin A): 50 to 55 pound-inches.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 865-155
(16)
Set the fuel control switch for engine 1 to "RUN".
S 865-156
(17)
Make sure the engine 1 fire handle on (P5) is locked in its position.
S 485-157
(18)
Install a jumper wire in loop A between pin A and pin C of the element TS683.
S 485-158
(19)
Install a jumper wire in loop B between pin A and pin C of the element TS683.
S 745-159
(20)
Make sure the warning EICAS message "FIRE ENG 1" shows.
S 715-160
(21)
Make sure you hear the aural warning bell.
S 715-161
(22)
Make sure the engine 1 fire handle light comes on.
S 865-165
(23)
Pull the engine 1 fire handle into the emergency fire position. S 715-163
(24)
Make sure you continue to hear the aural warning bell. S 715-164
(25)
Make sure the engine 1 fire handle light stays on. S 715-057
(26)
Push the fire handle into its usual position. S 085-166
(27)
Remove the jumper wire from loop A. S 085-167
(28)
Remove the jumper wire from loop B. S 745-168
(29)
Make sure the warning EICAS message "FIRE ENG 1" does not show.
WARNING:_______ DO NOT TURN THE FIRE HANDLE WHEN YOU PULL IT INTO THE EMERGENCY
FORE POSITION. IF YOU TURN THE FIRE HANDLE THE CONTENTS OF THE
FIRE BOTTLE WILL BE LET OUT.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
26-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 715-169
(30)
Make sure them fuel control switch light for engine 1, below the thrust levers, goes off.
S 715-171
(31)
Make sure you do not hear the aural warning bell.
S 915-172
(32)
If the test is necessary for engines 2, 3, or 4, do the test again one engine at a time.
S 755-045
(33)
Make sure these conditions occur when you do the test again to
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
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