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747-400 FAULT ISOLATION/MAINT MANUAL

SMOKE DETECTION PORT & TUBING SMOKE DETECTOR PAIR -SEE VENTURI EJECTOR -SEE

REFLECTED LIGHT ELECTRONIC

(ON SOME (ON SOME
AIRPLANES) AIRPLANES)

DETECTORS, M4893,M4894,M4895,M4896
VACUUM
M4897,M4898,M4899,M4900
PRESSURE SUPPLYSENSE
M7898,M7899,M7900,M7901  LINE (REFERENCE)
LINE
M7902,M7903,M7904,M7905

FWD

Lower Cargo Compartment Smoke Detection System - Component Location
Figure 102 (Sheet 3)

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747-400 MAINTENANCE MANUAL
 LOWER CARGO COMPARTMENT SMOKE DETECTION SYSTEM -
________________________________________________ ADJUSTMENT/TEST
_______________
 1.  General_______
 A.  This procedure contains two tasks. The first task does an operational test of the smoke detection system in the lower cargo compartment. The second task does a system test of the smoke detection system in the lower cargo compartment. You must do the procedures for the system test in sequence.
 (1)  
The operational test makes sure the system operates correctly. The test takes a minimum amount of time and uses only equipment installed in the airplane.

 (2)  
The system test makes sure all parts of the system operate correctly and meet performance requirements. The system test uses external equipment and includes these tests:

 -Two Connector Disconnected Test
 -One Connector Disconnected Test
 -Ejector Test
 -
Airflow Test for the Forward Cargo Sampling Tube

 -
Airflow Test for the Aft Cargo Sampling Tube

 -Vacuum Supply Tube Replacement Test
 -Smoke Test.
 B.  There are eight smoke detectors in the right side of the forward cargo compartment. There are eight more smoke detectors in the right side of the aft cargo compartment. You can get access to the smoke detectors through the lower cargo compartment.
 TASK 26-16-00-715-001
 2.  Operational Test________________
 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

 (5)  
SSM 26-16-01

 B.  Access
 (1)  Location Zones
 221 Control Cabin LH
 222 Control Cabin RH

 C.  Prepare for Operational Test
 S 865-003
 (1)  Supply electrical power (AMM 24-22-00/201).
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747-400
MAINTENANCE MANUAL

A

ALARM INDICATION
LIGHT (RED)
AND ARMING
SWITCH (WHITE)

Lower Cargo Compartment Smoke Detection System Component Location
Figure 501 (Sheet 1)

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747-400 MAINTENANCE MANUAL
SEE D
2 SMOKE DETECTORS
2 SMOKE DETECTORS EACH ZONE (QTY 8) EACH ZONE (QTY 8)
SEEC  SEEC
SMOKE DETECTOR
C

FWD
SMOKE DETECTOR EJECTOR D
Lower Cargo Compartment Smoke Detection System Component Location
Figure 501 (Sheet 2)

E00953
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