Duct Leak Detection System - Component Location
Figure 102 (Sheet 1)
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747-400
FAULT ISOLATION/MAINT MANUAL
S1048,S1467 S873 THRU S891,S1046,S1047, RIGHT WING THERMAL SWITCHES DSEE C
(2 LOCATIONS) WING ISOLATION VALVES (3 LOCATIONS) AIR CONDITIONING PACKS PRESSURIZATION WATER SYSTEM AFT CARGO HEAT
APU SHUTOFF VALVE
SEE E SHT 3
S892 THRU S910,S1050,S1051,S1052, S1464 LEFT WING THERMAL SWITCHES DCSEE
THERMAL SWITCH THERMAL SWITCH
1
C1 D
1 THERMAL SWITCHES ARE INTERCHANGEABLE
Duct Leak Detection System - Component Location Figure 102 (Sheet 2)
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747-400 FAULT ISOLATION/MAINT MANUAL
STA 1248
STA 1480
APU FROM SHT 2 BODY DUCT THERMAL SWITCHES S2214,S2215,S2216,S2217,S2218,S2219,S2220, S2221,S2222,S2223,S2224,S2225,S2226,S2227, S2228,S2229,S2230,S2231,S2232,S2233,S2234, S2235,S2236,S2237,S2238,S2239,S2240,S2241, S2242,S2243,S2244
Duct Leak Detection System - Component Location
Figure 102 (Sheet 3)
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747-400 MAINTENANCE MANUAL
DUCT LEAK DETECTION SYSTEM - ADJUSTMENT/TEST
____________________________________________
1. General_______
A. This subject has three tasks. The first task is an operational test of the thermal switches in the duct leak detection system. The thermal switches are found along the wing leading edge and in the struts. The thermal switches find areas that are too hot caused by leaks or breaks in the bleed air ducts and produce duct leak messages on EICAS.
B. The second task is a thermal switch set temperature test.
C. The third task is a system test of the duct leak detection system.
D. Extend the leading edge flaps or open the access panels to access the thermal switches.
TASK 26-18-00-705-001
2. Operational Test________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AIPC 26-18-01, Fig. 2
(3)
WDM 26-18-11
(4)
SSM 26-18-01 and SSM 26-18-02
B. Access
(1) Location Zone
221 Control Cabin L.H.
222 Control Cabin R.H.
C. Prepare for the Test
S 865-002
(1)
Supply electrical power to the standby AC bus (AMM 24-22-00/201).
S 865-003
(2)
Close these circuit breakers:
(a) P6 Main Power Distribution Panal 1) 6C5 ALT PWR LOOP A APU FIRE/BLD DUCT OVHT 2) 6H14 APU FIRE/BLD DUCT OVHT LOOP A 3) 6H15 APU FIRE/BLD DUCT OVHT LOOP B
S 865-007
(3) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) 6H1 FIRE EXTINGUISHER ENG 1&3 B
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747-400
MAINTENANCE MANUAL
Duct Leak Detection System Test
Figure 501 (Sheet 1)
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