(b)
Install only chromel contacts on chromel wires.
(c)
Do not connect the alumel wires to the chromel wires.
(d)
Install gold plated contacts for these two conditions: 1) If you do not have alumel or chromel contacts. 2) If the two sides of the connector and the receptacle are in
an area with the same temperature.
(e)
Install only alumel or chromel contacts on connectors that go through bulkheads or firewalls.
S 215-041-C00
(2) Examine the circuits for loose connectors, connectors with
corrosion, electrically grounded connectors and defective
thermocouples.
NOTE: Dissimilar materials at junctions (nuts, screws, washers and
____ terminal connections) can cause circuit resistance that is not correct.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
77-21-00
ALL ú ú C03 Page 504 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
MAIN JUNCTION BOX
SEGMENT JUNCTION
PROBE NO. 4
CONNECTOR SEE A
HARNESS (TYPICAL)
1 PROBE NO. 3
PROBE NO. 5 JUMP WIRE CONNECTOR
RIGHT PROBE NO. 2
JUNCTION
BOX
PROBE NO. 6
EGT HARNESS LEFT JUNCTION BOX
JUMP WIRE
(HARDLINE)
INTERFACE
CONNECTOR,
1 D2954
PROBE NO. 1 2
INTERFACE TERMINAL, T1012
6-PROBE EGT HARNESS A
1 ENGINES WITH CONNECTOR AT INTERFACE
2 ENGINES WITH TERMINAL LUG/BLOCK AT INTERFACE
EGT Thermocouple Harness and Probe System Test
Figure 501 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
77-21-00
ALL ú ú C01 Page 505 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SEE B RIGHT HARNESSPROBE NO. 8 EXTENSION LEAD
RIGHT PROBE NO. 7 LEFTJUNCTION JUNCTIONBOX RIGHT EGT BOX
HARNESS
PROBE NO. 6
PROBE NO. 5
LEFT EGT
HARNESS MAIN
JUNCTION
INTERFACE 1 PROBE NO. 9 FORWARD EXTENSION BOX
CONNECTOR, CABLE
D2954
PROBE NO. 4
PROBE NO. 1
LOWER
JUNCTION
PROBE NO. 2 BOX
2
LOWER HARNESS EXTENSION
INTERFACE TERMINAL, PROBE NO. 3 T1012
LOWER EGT HARNESS
9-PROBE EGT HARNESS
1
ENGINES WITH CONNECTOR
AT INTERFACE
B
2
ENGINES WITH TERMINAL LUG/BLOCK AT INTERFACE
EGT Thermocouple Harness and Probe System Test Figure 501 (Sheet 2)
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77-21-00
ALL ú ú C01 Page 506 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 735-060-C00
(3) Do the EGT accuracy test.
(a) Do these steps:
NOTE: The terminal block, T1012, is at the 9:30 o'clock
____
position.
ú 1) Install the millivolt source to the EGT indication system. 2) Disconnect the wire lugs from the studs of terminal block, T1012. ú 3) Connect the millivolt source to the wire lugs. 4) Adjust the temperature compensation to the ambient temperature. ú 5) Let the millivolt source become warm for 20 minutes before
you do the test. ú 6) Make an input of 850 C (35.314 MV) with the millivolt ú source.
7) Make sure the EGT indicator on the P2 panel shows this data: ~........................................................ | Ambient Temp | LED Display | Pointer | .......................................................... | Above 10 C | 847-853 C | 845-855 C | .......................................................... | Below 10 C | 846-854 C | 842.5-857.5 C | 2...................….................…..................1
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