(b)
Install dust caps on the electrical connector.
(c)
Remove the nut from the T13 sensor (20).
(d)
Remove the T13 sensor (20).
(e)
Remove and discard the packing (21).
TASK 49-61-05-404-013
5. Air Inlet Temperature and Thermocouple Cold Junction (T1/T6) Sensor___________________________________________________________________ Installation (Fig. 401)____________
A. References
(1)
WDM 49-11-16
(2)
SSM 49-11-01
B.
Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 2 | Temperature and Cold Junction | 49-61-05 | 01 | 10 | | | | Thermocouple Sensor (Air | | | | | | | Temperature Sensor T1/T6) | | | | | | 4 | Gasket | | | 15 | 2.......….......…...................................…...........…......….......1
C.
Access
(1)
Location Zone 317 APU Compartment-Upper Aft Side of Air Inlet Plenum, LH 318 APU Compartment-Upper Aft Side of Air Inlet Plenum, RH
(2)
Access Panel
317AL APU Access Door
318AR APU Access Door
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747-400 MAINTENANCE MANUAL
D. Procedure
S 434-014
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.
(1)
Install the T1/T6 sensor (3).
(a)
Install a new gasket (4) on the T1/T6 sensor (2).
(b)
Put the T1/T6 sensor (2) on the inlet plenum.
(c)
Install the two bolts (3) on the T1/T6 sensor (2).
1) Tighten the bolts (3) to 36-40 pound-inches (4.0-4.6 newton-meters).
(d)
Install the cable clamps (15) on the sensor cable.
(e)
Attach the clamps (15) to mounting brackets with bolts (12), washers (13), spacers (16), and nuts (14). 1) Tighten the nuts to 36-40 pound-inches (4.0-4.6
newton-meters).
(f)
Attach the end of the negative thermocouple wire (8) to the negative bus bar (9) with the bolt (5A), the washer (6A), and the nut (7A).
NOTE: On P/N 3900063 sensors the negative thermocouple
____ wire is white. On P/N 3900456 sensors the negative thermocouple wire is green.
1) Tighten the nut (7A) to 26-30 pound-inches (3.0-3.4 newton-meters).
(g) Attach the end of the positive thermocouple wire (10) to the positive bus bar (11) with the bolt (5), the washer (6), and the nut (7).
NOTE: On P/N 3900063 sensors the positive thermocouple
____ wire is green. On P/N 3900456 sensors the positive thermocouple wire is white.
1) Tighten the nut (7) to 18-20 pound-inches (2.0-2.2 newton-meters).
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747-400 MAINTENANCE MANUAL
(h)
Remove the dust caps from the electrical connector (1).
(i)
Connect the P10 (1) connector to the T1/T6 sensor (2) and tighten with your hand.
NOTE: The connector is fully tightened when you cannot see the
____
red color band.
S 414-027
(2)
Close the APU access doors:
(a)
Do a visual check of the EGT bus bars:
1) Make sure the bus bars are not damaged.
2) Make sure no metal parts touch the bus bars.
3) Make sure the bus bars do not touch each other.
(b)
Disengage the support rods for the APU access doors.
(c)
Put the support rods in the clips on the inner side of the APU access doors.
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