APU Fire Detection System - Component Location
Figure 102 (Sheet 3)

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747-400
FAULT ISOLATION/MAINT MANUAL

UPPER FIREDETECTOR, M217
SEE E
APU FIRE DETECTOR (TYPICAL),
M216 AND M217

E

LOWER FIRE DETECTOR, M216
SEE E
APU Fire Detection System - Component Location

Figure 102 (Sheet 4)

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747-400 MAINTENANCE MANUAL
 APU FIRE DETECTION SYSTEM - ADJUSTMENT/TEST
___________________________________________
 1.  General_______
 A.  This section contains an operational test and a system test for the APU fire detection system.
 (1)  
The operational test makes sure the system operates correctly in a minimum of time, using only equipment installed on the aircraft. The operational test includes a test using the FIRE/OVHT switch and a test using the CMC.

 (2)  
The system test provides a complete test of the system using the test equipment installed on the aircraft and a multimeter.

 (3)  
The system test has four tasks. The first task is an airplane wiring continuity test. The second task is a warning indication test. The third task is a detector element resistance test. The fourth task tests the functions of the APU fire handle.

 B.  The detector elements are installed on the left APU access door and near the aft APU mount. Access to the detectors is through the APU access doors.
 TASK 26-15-00-715-001
 2.  Operational Test (Fig. 501)________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
WDM 26-15-11

 (3)  
SSM 26-15-01

 B.  Access
 (1)  
Location Zone
 221 Control Cabin LH
 222 Control Cabin RH
 317 APU Compartment, LH
 318 APU Compartment, RH

 (2)  
Access Panel
 317A Door - Access - APU
 318A Door - Access - APU

 C.  Prepare for Test
 S 865-002
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-003

 (2)  
Close these circuit breakers:

 (a)  P6, Main Power Distribution Panel 1) 6H14, APU FIRE/BLD DUCT OVHT LOOP A 2) 6H15, APU FIRE/BLD DUCT OVHT LOOP B 3) 6H16, APU FIRE WARN HORN
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747-400
MAINTENANCE MANUAL

A

APU FIRE SWITCH (RED)

APU Fire Detection System Test
Figure 501 (Sheet 1)

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747-400
MAINTENANCE MANUAL

APU Fire Detection System Test
Figure 501 (Sheet 2)

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