Visual Inspection of the Exhaust Gas Temperature (EGT) Harnesses [CFML]

TASK 77-21-05-210-801-A
Visual Inspection of the Exhaust Gas Temperature (EGT) Harnesses

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.

ZONE: 210
ZONE: 400

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)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
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

C. Referenced Information

REFERENCE	DESIGNATION
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 77-21-05-000-801-A	Removal of the Exhaust Gas Temperature (EGT) Harness 1 (Channel A)
TASK 77-21-05-000-802-A	Removal of the Exhaust Gas Temperature (EGT) Harness 2 (Channel B)
TASK 77-21-05-400-801-A	Installation of the Exhaust Gas Temperature (EGT) Harness 1 (Channel A)
TASK 77-21-05-400-802-A	Installation of the Exhaust Gas Temperature (EGT) Harness 2 (Channel B)
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
Visual Inspection of the Exhaust Gas Temperature (EGT) Harnesses

3. Job Set-up
Subtask 77-21-05-941-054-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) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
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) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 77-21-05-010-060-A

B. Get Access
(1) Open the fan cowl doors (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) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 77-21-05-040-055-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) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 77-21-05-010-061-A

D. Get Access
(1) Open the thrust reverser cowl-doors (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
Subtask 77-21-05-210-050-A

A. Visual Inspection of the EGT Harness 1 (Channel A) and the EGT Harness 2 (Channel B)
(1) Do the visual inspection of the EGT harness 1 (Channel A) (1) and the EGT harness 2 (Channel B) (2) for the indications that follows:
(a) Do the visual inspection of harness connector (3) for:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Crack, dent, tear, corrosion, erosion/peening, scorings/scratches, nicks, deposits	Not serviceable (A3 connector, except cylinder and flange)	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
2.Nick, scoring/scratches	Serviceable with maximum depth of 0.03 mm (0.001 in.) and minimum bottom radius of 0.25 mm (0.01 in.) (A1 (Outside cylindrical surfaces of the connector))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
3.Deposits	Serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
4.Other	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).

(b) Do the visual inspection of harness connector backshell (4) for:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Crack, dent, tear, corrosion, erosion/peening	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
2.Nick	Serviceable with maximum depth of 0.10 mm (0.004 in.) and minimum bottom radius of 0.25 mm (0.01 in.)	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
3.Scoring/scratches	Serviceable with maximum depth of 0.10 mm (0.004 in.) and minimum bottom radius of 0.25 mm (0.01 in.)	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
4.Nick, scoring/scratches	Serviceable with maximum depth of 0.03 mm (0.001 in.) and minimum bottom radius of 0.25 mm (0.01 in.)	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
5.Deposits	Serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
6.Other	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.All	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).

(d) Do the visual inspection of harness connector capture plate (6) for:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Crack, tear	Not serviceable (C (capture plate screws), D (capture plate nuts), E (anchor plate), F (anchor nut rivets), H (back shell knurled coupling))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
2.Dent, corrosion, erosion/peening	Not serviceable (C (capture plate screws), D (capture plate nuts), E (anchor plate), F (anchor nut rivets), H (back shell knurled coupling))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
3.Nick	Not serviceable (C (capture plate screws), D (capture plate nuts))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
4.Nick	Serviceable with maximum depth of 0.10 mm (0.004 in.) and bottom radius of 0.25 mm (0.01 in.) (E (anchor plate), F (anchor nut rivets), H (back shell knurled coupling))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
5.Scoring/scratch	Not serviceable (C (capture plate screws), D (capture plate nuts))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
6.Scoring/scratch	Serviceable with maximum depth of 0.10 mm (0.004 in.) and bottom radius of 0.25 mm (0.01 in.) (E (anchor plate), F (anchor nut rivets), H (back shell knurled coupling))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
7.Deposits	Serviceable (C (capture plate screws), D (capture plate nuts), E (anchor plate), F (anchor nut rivets))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).

(e) Do the visual inspection of steel overbraid cables (7) for:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Crack, tear, corrosion, dent, erosion/peening, nick, scoring/scratches	Serviceable on J, K, L and M surfaces	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
2.Deposits	Not serviceable (C (capture plate screws), D (capture plate nuts), E (anchor plate), F (anchor nut rivets), H (back shell knurled coupling))	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
3.Individual broken wires	Serviceable if maximum 2 wires are broken	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
4.Engraved identification cannot be read with visual and optical device	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
5.Engraved identification absence	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
6.Scores and shock marks on engraved identification	Engraved identification must be readable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
7.Others	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).

(f) Do the visual inspection of KP and KN thermocouple cables (8) for:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Cracks, dents, corrosion, tear, erosion/peening, scorings/scratches, nicks	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
2.Discoloration of insulation	Serviceable for light discoloration. Brown discoloration is not permitted	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
3.Deposits	Serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).

(g) Do the visual inspection of harness terminal tags (9) for:

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Cracks, dents, corrosion, tear, erosion/peening, scorings/scratches, nicks	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
2.Nicks and scoring/scratches	Not serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).
3.Deposits	Serviceable	Replace the applicable engine wiring harness (Ref. AMM TASK 77-21-05-000-801) and (Ref. AMM TASK 77-21-05-400-801) or (Ref. AMM TASK 77-21-05-000-802) and (Ref. AMM TASK 77-21-05-400-802).

5. Close-up
Subtask 77-21-05-410-054-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 77-21-05-440-052-A

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

Subtask 77-21-05-410-055-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 06:37:52 UTC