C.
Procedure

 S 864-029
 (1)  
Make sure the APU control switch is OFF and attach a DO-NOT-OPERATE tag.

 S 864-030

 (2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 014-031
 (3)  
Open the APU access doors:

 (a)  
Open the latches on the APU access doors.

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A
747-400
MAINTENANCE MANUAL

SEE  B 
18. COPPER GASKET  SENSOR T12 AIR TEMPERATURE 17. STARTER 
SEE  A 
INLET CASE SENSOR HOUSING 
DUCT FAN INLET COOLING  19. 20. T13 AIR SENSOR ELECTRICAL CONNECTOR P20 TEMPERATURE  A FWD  16.  ELECTRICAL CONNECTOR P23 
21. PACKING 
LOAD OUTLET DUCT COMPRESSOR 
FWD 
B 
T12 and T13 Air Temperature Sensors Installation Figure 402 

F59077
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747-400 MAINTENANCE MANUAL
 (b)  
Open the APU access doors.

 (c)  
Engage the support rods for the APU access doors.

 S 034-032
 CAUTION:_______DO NOT HIT THE INLET PLENUM WITH YOUR HANDS OR TOOLS. THIS CAN CAUSE DAMAGE TO THE INLET PLENUM. IF YOU CAUSE DAMAGE TO THE INLET PLENUM, IT WILL BE NECESSARY TO REPLACE IT.
 (4)  
Remove the T12 sensor (17).

 (a)  
Disconnect the P23 connector (16) from the T12 sensor (17).

 (b)  
Install a dust cap on the P23 connector (16).

 (c)  
Remove the nut from the T12 sensor (17).

 (d)  
Remove the T12 sensor (17).

 (e)  
Remove the copper gasket (18).

 (f)  
Discard the copper gasket (18).

 TASK 49-61-05-004-046
 4.  T13 Air Temperature Sensor Removal (Fig. 402)__________________________________
 A. References
 (1)  
WDM 49-11-18

 (2)  
SSM 49-11-01

 (3)  
AIPC 49-61-09, Fig. 1

 B.
Access

 (1)  
Location Zone

 318  APU Compartment-Upper Side of APU and Forward of Air Inlet Plenum on Load Compressor Outlet Duct, RH

 (2)  
Access Panel
 317AL APU Access Door
 318AR APU Access Door

 C.
Procedure

 S 864-047
 (1)  
Make sure the APU control switch is OFF and attach a DO-NOT-OPERATE tag.

 S 864-048

 (2)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6 Main Power Distribution Panel
 1) 6K18 APU ALTN CONT

 (b)  
P83 Panel, E8 Aft Equipment Center
 1) APU PRIMARY CONT

 S 014-049
 (3)  
Open the APU access doors:

 (a)  
Open the latches on the APU access doors.

 (b)  
Open the APU access doors.

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747-400 MAINTENANCE MANUAL
 (c) Engage the support rods for the APU access doors.
 S 024-065
 (4)
Remove the T13 sensor (20).

 (a)
Disconnect the P20 connector (19) from the T13 sensor (20).
　
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