_
2.
ENG 2 EGT IND
_
9) AIRPLANES WITH EIS; Open these circuit breakers and attach DO-NOT-CLOSE tags: a) P6 Load Control Center
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77-21-00
ALL ú ú C06.1 Page 507 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
1.
EIS PRI 2
_
2.
EIS PRI 4
_ ú 10) Make sure that the EGT LED display goes out of view. ú 11) Make sure that the pointer moves down the scale to zero.
12) AIRPLANES WITHOUT EIS; Remove DO-NOT-CLOSE tags and close these circuit breakers: a) P6 Load Control Center
1.
ENG 1 EGT IND
_
2.
ENG 2 EGT IND
_
13) AIRPLANES WITH EIS; Open these circuit breakers and attach DO-NOT-CLOSE tags: a) P6 Load Control Center
1.
EIS PRI 2
_
2.
EIS PRI 4
_ ú 14) Make sure that the pointer and the digital indicator operate correctly. ú 15) Remove the millivolt source. 16) Connect the wire lugs to the terminal block, T1012, at the
9:30 o'clock position.
S 765-071-C00
(4) Do the EGT Thermocouple Harness Electrical Test At Ambient Temperature
(a) Prepare for the harness resistance test.
1) AIRPLANES WITHOUT EIS; Open these circuit breakers and attach DO-NOT-CLOSE tags: a) P6 Load Control Center
1.
ENG 1 EGT IND
_
2.
ENG 2 EGT IND
_
2) AIRPLANES WITH EIS; Open these circuit breakers and attach DO-NOT-CLOSE tags: a) P6 Load Control Center
1.
EIS PRI 2
_
2.
EIS PRI 4
_
CAUTION: BEFORE YOU DISCONNECT THE CONNECTOR, REMOVE THE
_______ NEAREST CLAMP OR STRAP WHICH SECURES THE LEAD TO THE BRACKET. DAMAGE TO THE LEAD CAN RESULT.
3) Disconnect the electrical connector, D2954, or the terminal block, T1012, at the 9:30 interface. a) Disconnect the right EGT extension harness at the right
secondary junction box. b) Disconnect the main junction box extension at the upper and lower left secondary junction box.
(b) Do the harness resistance test. 1) Connect the test lead connector, 856A3317, to the right ú harness segment and the ohmmeter. 2) Measure the resistance value SH1.
a) Make a record of SH1. ú 3) Invert the polarity on the ohmmeter.
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77-21-00
ALL ú ú C08.1 Page 508 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
4) Measure the resistance value SH2. a) Make a record of SH2. 5) Calculate the final resistance value:
a) Subtract the resistance value of the leads from the average of the recorded resistance values ([SH1 + SH2] divided by 2).
ú 6) Disconnect the test lead and the ohmmeter from the harness ú receptacle. ú 7) With the megohmmeter, measure the insulation resistance
between one pin and the case. 8) Replace the right harness segment for these conditions: a) The final resistance value is not between 0.41 and
0.57 ohms. b) The insulation resistance is less than 10M ohms. 9) Connect the test lead connector, 856A3317, to the upper ú left harness segment and the ohmmeter. 10) Measure the resistance value CH1. a) Make a record of CH1. ú 11) Invert the polarity on the ohmmeter. 12) Measure the resistance value CH2. a) Make a record of CH2. 13) Calculate the final resistance value:
a) Subtract the resistance value of the leads from the average of the recorded resistance values ([CH1 + CH2] divided by 2).
ú 14) Disconnect the test lead and the ohmmeter from the harness ú receptacle. ú 15) With the megohmmeter, measure the insulation resistance
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