Installation of the Exhaust Gas Temperature (EGT) Harness 1 (Channel A) [CFML]

TASK 77-21-05-400-801-A
Installation of the Exhaust Gas Temperature (EGT) Harness 1 (Channel A)

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400
FIN: 4168KS

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 17.9 and 16.2 lbf.in (0.20 and 0.18 m.daN )
No specific	Torque wrench: range to between 32.6 and 29.5 lbf.in (0.37 and 0.33 m.daN )
No specific	Torque wrench: range to between 38 and 32 lbf.in (0.43 and 0.36 m.daN )
No specific	Torque wrench: range to between 124 and 106 lbf.in (1.40 and 1.20 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2442)	engine oil

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-710-802-A	FADEC Test (Menu Mode)
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Exhaust Gas Temperature (EGT) Harness 1

3. Job Set-up
Subtask 77-21-05-941-051-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Make sure that the WARNING NOTICE(S) are in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 77-21-05-010-052-A

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 77-21-05-040-051-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Make sure that you did the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 77-21-05-010-053-A

D. Get Access
(1) Make sure that the thrust reverser cowl-doors are open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

4. Procedure

CAUTION: MAKE SURE THAT YOU DO NOT TWIST THE EGT HARNESS. IF YOU DO, DAMAGE TO THE EGT HARNESS CAN OCCUR.

Subtask 77-21-05-420-050-A

A. Installation of the Exhaust Gas Temperature harness 1
(1) Remove all COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and connectors.
(2) Apply engine oil (Material No.CP2442) on the threads of the two bolts (2).
(3) Put the EGT harness 1 (1) in position on the engine.

NOTE: When you install the harness, make sure that there is correct clearance between the harness and the fuel lines, oil line, pneumatic ducts, sensor lines and other hardware. Make sure that the harness does not touch sharp edges on the engine or the engine components.

(4) Install the EGT harness 1 (1) in the support bracket (4).
(5) Install the two bolts (2) that attach the EGT harness 1 (1) to the support bracket (4).
(6) TORQUE the two bolts (2) to between 124 and 106 lbf.in (1.40 and 1.20 m.daN )

.
(7) Connect the electrical connector (3) to the EGT harness 1 (1) receptacle (Ref. AMM TASK 70-70-00-910-804).
(8) Apply engine oil (Material No.CP2442) on the threads of the bolt (7), bolt (8), bolt (11), bolt (15), bolt (18), bolt (19), bolt (24), bolt (27), bolt (30), bolt (33), bolt (36) and bolt (39).
(9) Loosely install the bolts that attach the loop clamps and the EGT harness 1 (1) to the brackets as follows:
(a) Loosely install the bolt (7) that attaches the loop clamp (6) and the EGT harness 1 (1) to the support bracket (5).
(b) Loosely install the bolt (8) that attaches the loop clamp (9) and the EGT harness 1 (1) to the support bracket (10).
(c) Loosely install the bolt (11) that attaches the loop clamp (12) and the EGT harness 1 (1) to the support bracket (13).
(d) Loosely install the bolt (18) that attaches the loop clamp (17) and the EGT harness 1 (1) to the support bracket (16).
(e) Loosely install the bolt (15) that attaches the loop clamp (14) and the EGT harness 1 (1) to the support bracket (16).
(f) Loosely install the bolt (19) that attaches the loop clamp (20) and the EGT harness 1 (1) to the support bracket (21).
(g) Loosely install the bolt (24) that attaches the loop clamp (23) and the EGT harness 1 (1) to the support bracket (22).
(h) Loosely install the bolt (27) that attaches the loop clamp (26) and the EGT harness 1 (1) to the support bracket (25).
(i) Loosely install the bolt (30) that attaches the loop clamp (29) and the EGT harness 1 (1) to the support bracket (28).
(j) Loosely install the bolt (33) that attaches the loop clamp (32) and the EGT harness 1 (1) to the support bracket (31).
(k) Loosely install the bolt (36) that attaches the loop clamp (35) and the EGT harness 1 (1) to the support bracket (34).
(l) Loosely install the bolt (39) that attaches the loop clamp (38) and the EGT harness 1 (1) to the support bracket (37).

CAUTION: MAKE SURE THE EGT HARNESS LEADS ARE IN THE CORRECT POSITION BEFORE YOU TIGHTEN THE CAPTIVE NUTS. IF THE LEADS ARE NOT IN THE CORRECT POSITION, YOU CAN CAUSE DAMAGE TO THE EGT HARNESS LEADS AND THE EGT SENSOR.

CAUTION: DO NOT APPLY TOO MUCH TORQUE TO THE CAPTIVE NUTS. IF YOU APPLY TOO MUCH TORQUE TO THE CAPTIVE NUTS, YOU CAN CAUSE DAMAGE TO THE TERMINALS ON THE EGT SENSORS.

CAUTION: AFTER THE CONNECTION OF THE LEAD WIRES TO THE EGT SENSOR, DO NOT PUT STRAIN OR FORCE ON THE LEAD WIRES OR ON THE ELECTRICAL STUDS OF THE EGT SENSOR. IF YOU DO NOT OBEY THIS PRECAUTION, DAMAGE TO THE ENGINE CAN OCCUER.

(10) Connect the eight EGT harness 1 (1) leads to the four EGT sensors (42) as follows:

NOTE: If there is any overlength of lead wire (40) and (41), wrap the longest branch of the harness around the smallest one.

NOTE: The EGT sensor has a large terminal and a small terminal. Make sure that you install the nuts on the correct terminals.

(a) Install the four EGT harness 1 large-terminal-leads (40) hand-tight to the large terminals of the four EGT sensors (42).
(b) Install the four EGT harness 1 small-terminal-leads (41) hand-tight to the small terminals of the four EGT sensors (42).
(c) TORQUE the large terminal captive-nuts of the four EGT harness 1 leads (40) to between 32.6 and 29.5 lbf.in (0.37 and 0.33 m.daN )

.
(d) TORQUE the small terminal captive-nuts of the four EGT harness 1 leads (41) to between 17.9 and 16.2 lbf.in (0.20 and 0.18 m.daN )

.
(11) TORQUE the loop clamp bolt (7), bolt (8), bolt (11), bolt (15), bolt (18), bolt (19), bolt (24), bolt (27), bolt (30), bolt (33), bolt (36) and bolt (39) to between 38 and 32 lbf.in (0.43 and 0.36 m.daN )

Subtask 77-21-05-710-050-A

B. Test
(1) Do the FADEC test (menu mode) (Ref. AMM TASK 73-29-00-710-802).

5. Close-up
Subtask 77-21-05-410-052-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 77-21-05-440-051-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 77-21-05-410-053-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 07:41:40 UTC