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(2) Put an access platform in position.
Subtask 77-21-10-040-079
C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041). Subtask 77-21-10-010-095
D. Open the thrust reverser doors (Ref. TASK 78-36-00-010-040):
FOR 1000EM1
451AL, 452AR
FOR 1000EM2
461AL, 462AR
4. Procedure
_________
R Subtask 77-21-10-869-057
R A. Use Fluke 187 or equivalent ohmmeter. Subtask 77-21-10-280-051
R B. Inspection/Check of the T495 Thermocouple Wiring Harness
R (Ref. Fig. 601/TASK 77-21-10-991-301, 602/TASK 77-21-10-991-302)
R (1) Electrical check of the L/H lower and upper thermocouple (2 probes)
R lead assemblies and R/H lower thermocouple (2 probes) lead assembly. CAUTION : REMOVE THE NEAREST CLAMPS WHICH ATTACH THE LEADS TO THE
_______ BRACKETS, BEFORE YOU DISCONNECT THE CONNECTORS. R R NOTE : Make sure that the connectors are clean and clear of unwanted
____ R materials.
(a) Do a resistance check as follows:
R 1_ Cut and remove the lockwire.
R 2_ Disconnect the lower extension lead from the parallel junctionR box of the R/H lower thermocouple lead assembly, then the R branches of the main junction box assembly from the parallel R boxes of L/H upper and lower thermocouple lead assemblies.
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R Wiring Diagram of the Harness of the T495 Thermocouple R Figure 601/TASK 77-21-10-991-301
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R Inspection/Check of T495 Thermocouple Wiring Harness R Figure 602/TASK 77-21-10-991-302
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R 3_ Connect the CHECK - LEAD FOR WIRING HARNESS EGT - RH
R (856A3317P02) to the parallel junction box receptacle of the
R thermocouple lead assembly that you have to check.
4_ Connect the wires of CHECK - LEAD FOR WIRING HARNESS EGT - RH
(856A3317P02) to the ohmmeter, accuracy 1%.
R 5_ Measure and record the ohmic resistance value. Subtract the
R lead ohmic resistance value of the CHECK - LEAD FOR WIRING
R HARNESS EGT - RH (865A3317P02) to find the ohmic resistance
R value A of the thermocouple lead assembly.
R 6_ Invert the wires of the CHECK - LEAD FOR WIRING HARNESS EGT -
R RH (856A3317P02). Measure and record the ohmic resistance
R value. Subtract the lead ohmic resistance value of the tool to
R find the ohmic resistance value B of the thermocouple lead
R assembly.
R 7_ Add the ohmic resistance values A and B, and divide them by
R two. The resultant value must be 0.61 ohm plus or minus 0.12
R ohm.
(b) Do an insulation check as follows:
1_ Strap the two wires of the adapter lead, and connect them to a
R terminal of the megohmeter.
R 2_ Connect the other terminal of the megohmeter to the casing.
R The insulation resistance value must be greater than 10
R meghoms.
R 3_ Disconnect the CHECK - LEAD FOR WIRING HARNESS EGT - RH
R (856A3317P02) from the thermocouple lead assembly.
R 4_ Connect the lower extension lead to the parallel junction box
R of the R/H lower thermocouple lead assembly, then the branches
R of the main junction box assembly to the parallel boxes of L/H
R upper and lower thermocouple lead assemblies.
R 5_ Torque the connecting nut to between 168 and 186 lbf.in (1.89
R and 2.10 m.daN) and safety with lockwire 0.032 in. (0.8 mm)
R dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia.
R (Material No. CP8002).
E E Aug 01/04 E E ECES ER (2) Electrical check of the R/H thermocouple (3 probes) lead assembly.
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