S 865-252
(21)
Close this circuit breaker:
(a) 6C5, ALTN PWR LOOP A APU FIRE/BLD DUCT OVHT
S 865-253
(22)
Make sure the EICAS (status) message "APU FIRE LOOP A" does not show.
S 425-254
(23)
Connect a jumper wire from the center pin DM216A (airplane wiring) to the connector shell of disconnected detector element.
S 865-255
(24)
Make sure the EICAS (status) message "APU FIRE LOOP A" is on.
S 025-256
(25)
Remove the jumper wire.
S 865-257
(26)
Open this circuit breaker:
(a) 6H15, APU FIRE/BLD DUCT OVHT LOOP B
S 865-258
(27)
Make sure the EICAS (status) message "APU FIRE LOOP B" comes on.
S 865-259
(28)
Close this circuit breaker:
(a) 6H15, APU FIRE/BLD DUCT OVHT LOOP B
S 865-260
(29)
Make sure the EICAS (status) message "APU FIRE LOOP B" does not show.
S 425-261
(30)
Connect a jumper wire from the center pin DM216B (airplane wiring) to the connector shell of the disconnected detector element.
(31)
Make sure the EICAS (status) message "APU FIRE LOOP B" comes on.
S 865-262
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MAINTENANCE MANUAL
S 485-045
(32) Connect the jumper wire from the center pin DM216A (loop A) to the connector shell of the disconnected detector element.
NOTE: Keep the jumper on the detector DM216B (loop B).
____
S 725-046
(33) Make sure these EICAS messages come on:
-
APU FIRE LOOP A (status)
-
APU FIRE LOOP B (status)
->DET FIRE APU (advisory).
S 085-047
(34)
Remove both jumpers.
S 725-048
(35)
Make sure these EICAS messages go out of view:
-
APU FIRE LOOP A (status)
-
APU FIRE LOOP B (status).
S 715-159
(36) Make sure the EICAS (advisory) message, >DET FIRE APU, still shows.
NOTE: The EICAS message is still present on the EICAS CRT due to an
____ AFOLTS latch. Pushing the FIRE/OVHT TEST switch in the Warning Indication Test will unlatch the AFOLTS circuitry and remove the message.
S 435-047
(37)
Install the connector DM216A to the APU fire detector M216.
S 435-048
(38)
Tighten the connector coupling nut to 50 to 70 pound-inches.
S 435-049
(39)
Install the connector DM216B to the APU fire detector M216.
S 435-050
(40)
Tignten the connector coupling nut to 50 to 70 pound-inches.
S 435-051
(41)
Install the lockwire on DM216A per BAC 5018 double twist method if the detector resistance test will not be done.
S 435-052
(42)
Install the lockwire on DM216B per BAC 5018 double twist method if the detector resistance test will not be done.
(a) P6, Main Power Distribution Panel
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747-400 MAINTENANCE MANUAL
F. Warning Indication Test
S 865-056
(1)
Make sure the APU fire handle on the fire control module M7326 (P5) is locked and in the stowed position.
S 865-057
(2)
Close this circuit breaker:
(a) P6, Main Power Distribution Panel
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本文链接地址：747-400 AMM 飞机维护手册 防火 FIRE PROTECTION 1(94)
