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 C.  If there is an indication that a detector does not work correctly, do a check of the lamp before you replace the detector.
 TASK 26-16-01-004-001
 2.  Remove the Smoke Detector (Fig. 401)_________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AIPC 26-16-01, Fig. 1

 (3)  
AIPC 26-16-01, Fig. 2

 (4)  
WDM 26-16-11 thru WDM 26-16-16

 B.  Access
 (1)  Location Zones 122 Forward Cargo Container Compartment Forward Half R.H. 142 Aft Cargo Compartment R.H.
 C.  Procedure
 S 864-002
 (1)  Open these circuit breakers on the overhead circuit breaker panel, P7, and attach DO-NOT-CLOSE tags:
 (a)  
7H14, CARGO SMOKE DETECT LWR A

 (b)  
7H15, CARGO SMOKE DETECT LWR B

 S 014-003
 (2)  
Get access to the applicable smoke detector (1) in the lower cargo compartment.

 (3)  
Remove the insulation around the smoke detectors where applicable.

 S 014-023
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A
747-400
MAINTENANCE MANUAL

Smoke Detector Installation
Figure 401

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A 747-400 MAINTENANCE MANUAL
 (4)  S 034-004Remove the applicable electrical connector (2) in the table that follows:
 ~................................................................ | CONNECTOR | DETECTOR | LOCATION | .................................................................. | DM7898 | M7898 | DET A - FWD CARGO SMOKE - ZONE 1 | | DM7899 | M7899 | DET B - FWD CARGO SMOKE - ZONE 1 | | DM7900 | M7900 | DET A - FWD CARGO SMOKE - ZONE 2 | | DM7901 | M7901 | DET B - FWD CARGO SMOKE - ZONE 2 | | DM4893 | M4893 | DET A - FWD CARGO SMOKE - ZONE 3 | | DM4894 | M4894 | DET B - FWD CARGO SMOKE - ZONE 3 | | DM4895 | M4895 | DET A - FWD CARGO SMOKE - ZONE 4 | | DM4896 | M4896 | DET B - FWD CARGO SMOKE - ZONE 4 | | DM4897 | M4897 | DET A - AFT CARGO SMOKE - ZONE 1 | | DM4898 | M4898 | DET B - AFT CARGO SMOKE - ZONE 1 | | DM4899 | M4899 | DET A - FWD CARGO SMOKE - ZONE 2 | | DM4900 | M4900 | DET B - FWD CARGO SMOKE - ZONE 2 | | DM7902 | M7902 | DET A - FWD CARGO SMOKE - ZONE 3 | | DM7903 | M7903 | DET B - FWD CARGO SMOKE - ZONE 3 | | DM7904 | M7904 | DET A - AFT CARGO SMOKE - ZONE 4 | | DM7905 | M7905 | DET B - AFT CARGO SMOKE - ZONE 4 | 2............….............….....................................1
 (5)  S 034-005Remove the clamp (6) and the sleeve (7) from the transition (5).
 (6)  S 034-006Remove the transition (5) and the clamp (4) from the air inlet (3).
 (7)  S 034-019Remove the transition (5) and the clamp (4) from the air outlet (10).
 (8)  S 034-007Remove the four screws (9) and washers (8) that hold the detector.
 (9)  S 024-020Remove the detector (1).

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A
747-400 MAINTENANCE MANUAL
 TASK 26-16-01-404-008
 3.  Install the Smoke Detector (Fig. 401)__________________________
 A. Parts
 ~...................................................................... | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ........................................................................ | 401 | 1 | Detector | 26-16-01 | 05 | 15 | | | 9 | Screw | | | 20 | 2......…........…...........................…..........….....….........1
　
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