M7352 - EIU C P83 AFT APU EQUIPMENT CONTROL AND CIRCUIT BREAKER PANEL
M7351 - EIU R
E2-6 EQUIPMENT CENTER-MAIN RIGHT SHELF
APU Duct Overheat Detection System Simplified Schematic
Figure 2
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A
747-400
FAULT ISOLATION/MAINT MANUAL
APU DUCT OVERHEAT DETECTION SYSTEM
COMPONENT SHT 102 FIG. QTY ACCESS/AREA REFERENCE
CIRCUIT BREAKERS - 1 833, AFT EQUIPMENT CENTER, P83
APU DUCT OVHT, C385 1 *
CIRCUIT BREAKERS - 1 FLIGHT COMPT, P7
EIU L, C10174 1 7F9 *
EIU C, C10175 1 7F10 *
EIU R, C10176 1 7F15 *
MODULE - (REF 49-61-00, FIG. 101) LIGHT - APU DUCT OVHT, L6 1 1 833, AFT EQUIPMENT CENTER, P83 *
APU ELEC CONTROL, M7847 1 833, AFT EQUIPMENT CENTER, E8
RELAY - DUCT OVHT, R686 1 1 833, AFT EQUIPMENT CENTER, P83 *
SWITCH - APU DUCT OVHT RESET, S220 1 1 833, AFT EQUIPMENT CENTER, P83 *
SWITCH - THERMAL, S969,S970,S971,S972,S973, S974,S975,S976,S977,S978,S979,S980,S981, S982,S983 2 15 46, AFT CARGO COMPT LEFT WALL 26-19-01
SWITCH - THERMAL, S984,S985,S986,S1173,S1924 2 5 26-19-01
S2211,S2212,S2213 SWITCH - THERMAL, S2207,S2208,S2209,S2210, L EFIS/EICAS INTERFACE, M7353 UNIT - (REF 31-61-00, FIG. 101) C EFIS/EICAS INTERFACE, M7352 R EFIS/EICAS INTERFACE, M7351 2 7 26-19-01
* SEE WDM EQUIPMENT LIST
APU Duct Overheat Detection System - Component Index
Figure 101
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747-400 FAULT ISOLATION/MAINT MANUAL
OVERHEAD CIRCUIT BREAKER PANEL, P7
SEE A
AFT APU EQUIPMENT CONTROL AND CIRCUIT BREAKER PANEL, P83
SEE B
DUCT OVERHEAT RELAY, R686
P83
AFT EQUIPMENT CENTER E8
A
5
7
7
7
5
5
APU DUCT
R686
OVERHEAT INDICATION, L6
APU DUCT OVERHEAT RESET SWITCH,
S220
APU DUCT OVERHEAT
IND LIGHT
RESET SW
APU EQUIPMENT CONTROL AND CIRCUIT BREAKER PANEL, P83 B Apu Duct Overheat Detection System - Component LocationFigure 102 (Sheet 1)
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747-400 FAULT ISOLATION/MAINT MANUAL
THERMAL SWITCH (TYPICAL)
C
Apu Duct Overheat Detection System - Component Location
Figure 102 (Sheet 2)
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747-400 MAINTENANCE MANUAL
APU DUCT OVERHEAT DETECTION SYSTEM - ADJUSTMENT/TEST
____________________________________________________
1. General
_______
A. This subject has one task. The task is a system test of the thermal switches along the APU air duct. The thermal switches sense overheat conditions caused by leaks or ruptures in the APU air duct.
B. There is no operational test procedure because the system has no self-test capabilities.
C. The system test include these tests:
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