S 745-123
(19)
Make sure bit 24 on the CMC input monitoring is set to one.
S 085-078
(20)
Remove the jumper wire from loop B.
S 745-126
(21)
Make sure bit 24 on the CMC input monitoring is set to zero.
S 485-127
(22)
Install a jumper wire in loop B between the center pin and the connector shell of overheat detector element, T684.
S 745-128
(23)
Make sure bit 24 on the CMC input monitoring is set to one.
S 085-129
(24)
Remove the jumper wire from loop B.
S 485-130
(25)
Install a 300 ohm resistor in loop B between the center pin of the connector, DT684C, and the connector shell of the overheat detector element, T684.
S 485-131
(26)
Install a jumper wire from the center pin of the connector, DT684C, loop B (airplane wiring) to the connector shell of the disconnected fire detector element.
S 745-132
(27)
Make sure the caution EICAS message "OVHT ENG 1 NAC" shows.
(28)
Remove the jumper wire and the resistor from loop B.
(29)
Make sure the warning EICAS message "OVHT ENG 1 NAC" does not show.
S 435-054
(30)
Connect connector, DT684C, to the overheat detector element, T684.
(a) Tighten the connector to 50 to 70 pound-inches(5.6 - 7.9 newton-meters).
(31)
Make sure the EICAS message "ENG OVHT 1 LP A" stays on.
S 085-079
S 745-134
S 745-136
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747-400 MAINTENANCE MANUAL
S 485-137
(32)
Remove the jumper wire from loop A.
S 435-139
(33)
Connect connector DT684A to the overheat detector element, T684.
(a) Tighten the connector to 50 to 70 pound-inches(5.6 -7.9 newton-meters).
S 915-138
(34)
If the test is necessary for engines 2, 3, or 4, do the test again one engine at a time.
S 745-055
(35)
Make sure these conditions occur when you do a test on engine 2, 3,
or 4: CMC INPUT MONITORING
~................................................................. | ENGINE | EICAS MESSAGE | LOOP A (BIT) | LOOP B (BIT) | ................................................................... | 2 | OVHT ENG 2 NAC | 25 | 26 | ................................................................... | 3 | OVHT ENG 3 NAC | 11 | 12 | ................................................................... | 4 | OVHT ENG 4 NAC | 13 | 14 | 2...........…...................…................…................1
G. AIRPLANES WITH SYSTRON-DONNER FIRE DETECTION SYSTEMS; Engine Fire Detection Indication System Test
S 865-200
(1)
Push and hold the FIRE/OVHT TEST switch on the Miscellaneous Switching panel (P5).
S 845-141
(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)
Push the LSK next to "<INPUT MONITORING".
(5)
Write in "E/034/270/00"
S 865-142
S 865-143
S 865-144
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A
747-400
MAINTENANCE MANUAL
(6) S 865-145Push the LSK next to "-/--/---/--". 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 防火 FIRE PROTECTION 1(32)
