S 864-003

 (2)
Open these circuit breakers and install 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

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A
747-400 MAINTENANCE MANUAL
SEE B
SEE A SEE D SEE E
SEE F
SEE C 10. POSITIVEFWD
THERMOCOUPLE 5A. BOLT LEAD
A
4.  GASKET
5.  BOLT
INLET 8. NEGATIVE
PLENUM

THERMOCOUPLE LEADCABLE 11. POSITIVE
2.  T1/T6 BUS BAR
SENSOR
9.  NEGATIVE BUS BARBOLT
3.  BOLT (2 PLACES) 6A. WASHER14. NUT
6.  WASHER
ANGLE 7A. NUT
BRACKET

7.  NUT
15. CABLE
AFT CLAMP
12. BOLT
C
12. BOLT
1.  ELECTRICAL 15. CABLE
CONNECTOR P10 CLAMP
B  16. SPACER
MOUNTING BRACKET
13.
WASHER

14.
NUT

D
Air Inlet Temperature and Thermocouple Cold
Junction (T1/T6) Sensor Installation
Figure 401 (Sheet 1)

F58249
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A
747-400
MAINTENANCE MANUAL

 S 014-004
 (3)  
Open the APU access doors:

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

 (b)  
Open the APU access doors.

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

 S 034-070
 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 T1/T6 sensor:

 (a)  
Disconnect the P10 connector (1) from the T1/T6 sensor (2).

 (b)  
Install dust caps on the electrical connector (1).

 (c)  
Remove the bolt (5A), the washer (6A), and the nut (7A) that attach the end of the negative thermocouple wire (8) to the negative bus bar (9).

 (d)  
Remove the bolt (5), the washer (6), and the nut (7) that attach the end of the positive thermocouple wire (10) to the positive bus bar (11).

 (e)  
Remove the bolts (12), washers (13), spacers (16), and nuts (14) that attach the cable clamps (15) to the mounting brackets.

Air Inlet Temperature and Thermocouple Cold
Junction (T1/T6) Sensor Installation
Figure 401 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 (f)  
Remove the cable clamps (15) from the cables.

 (g)  
Remove the bolts (3) that attach the T1/T6 sensor (2) to the inlet plenum.

 (h)  
Remove the T1/T6 sensor (2).

 (i)  
Remove the gasket (4) from the inlet plenum.

 (j)  
Discard the gasket (4).

 TASK 49-61-05-004-028
 3.  T12 Air Temperature Sensor Removal (Fig. 402)__________________________________
 A. References

 (1)  
WDM 49-11-81

 (2)  
SSM 49-11-01

 (3)  
AIPC 49-61-08, Fig. 1

 B.
Access

 (1)  
Location Zone

 318  APU Compartment-Lower Forward Side of APU on Air Inlet Plenum, RH

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