(b)
7H15, CARGO SMOKE DETECT LWR B
S 715-110
(2) Make sure these conditions occur on the fire control module:
(a)
The FWD and AFT lights are off.
(b)
The ARMED light does not show.
S 865-111
(3) Push and hold the FIRE/OVHT TEST switch on the miscellaneous switching module, M7317, on the P5 panel.
(a) After approximately 20 seconds, make sure the EICAS messages, FIRE CARGO FWD and FIRE CARGO AFT, do not show.
S 715-114
(4) Make sure these conditions occur:
(a)
The FWD and AFT warning lights on the fire control module are on.
(b)
The master WARNING lights come on.
(c)
The alarm bell is on.
S 865-116
(5)
Release the FIRE/OVHT TEST switch.
S 715-117
(6)
Make sure these conditions occur:
(a)
The alarm bell goes off.
(b)
The master WARNING lights go off.
S 865-118
(7) Open these circuit breakers on the P7 panel:
(a) 7H14, CARGO SMOKE DETECT LWR A
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747-400 MAINTENANCE MANUAL
(b) 7H15, CARGO SMOKE DETECT LWR B
S 025-196
(8) Disconnect the two electrical connectors, DM7898 and DM7899, from the two inboard smoke detectors with the labels, FWD CGO 1 LP A and FWD CGO 1 LP B.
NOTE: The smoke detectors M7898, M7899, M7900, M7901, M4893,
____ M4894, M4895 and M4896 are installed above the ceiling liner at STA 646, 654, 666 and 674 (Fwd, Zones 1 thru 4). The smoke detectors M4897, M4898, M4899, M4900, M7902, M7903, M7904 and M7905 are installed above the ceiling liner at STA 1866, 1874, 1886 and 1894 (AFT, Zones 1 thru 4). The smoke detectors are accessible through two access panels provided in the ceiling liner.
S 865-120
(9) Close these circuit breakers on the P7 panel:
(a)
7H14, CARGO SMOKE DETECT LWR A
(b)
7H15, CARGO SMOKE DETECT LWR B
S 865-121
(10) Push and hold the FIRE/OVHT TEST switch on the miscellaneous switching module.
(a)
After approximately 10 seconds, make sure these conditions occur: 1) The EICAS message, FIRE TEST FAIL, shows. 2) The EICAS message, FIRE CARGO FWD, shows. 3) The EICAS message, FIRE CARGO AFT, does not show.
(b)
Make sure these conditions occur:
1) The alarm bell is on.
2) The WARNING lights come on.
S 865-124
(11) Push the master CAUTION/WARNING switch on the pilot's glare shield.
(a) Make sure the alarm bell goes off.
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S 865-126
(12)
Release the FIRE/OVHT TEST switch.
S 715-128
(13)
Make sure the EICAS status message, CARGO DET FWD 1, shows.
NOTE: The EICAS status message will show after 20 seconds.
____ The EICAS status message, FWD CARGO 1 LP A, can show momentarily.
S 865-129
(14) Open these circuit breakers on the P7 panel:
(a)
7H14, CARGO SMOKE DETECT LWR A
(b)
7H15, CARGO SMOKE DETECT LWR B
S 425-197
(15) Connect the two electrical connectors, DM7898 and DM7899, to the two smoke detectors with the labels, FWD CGO 1 LP A and FWD CGO 1 LP B.
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