Detailed Visual Inspection of the Temperature Indicating System [PW11]

TASK 77-21-00-220-801-A
Detailed Visual Inspection of the Temperature Indicating System

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

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

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	1	AIR SOURCE FILTERED, DRY
No specific	1	MULTIMETER - STANDARD

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth
(Material No.P05-067)	Non-Metallic Soft Bristle Brush
(Material No.P05-126)	Brush, short bristle nylon
(Material No.P11-014)	isopropyl alcohol

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-27-00-910-805-A	SPOP 209 - Degreasing of Parts by Aqueous Cleaning
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-21-00-200-805-A	Visual Examination of the FADEC System Wiring Harnesses (Ground Harness Check)
TASK 73-21-24-000-801-A	Removal of the T3 Probe
TASK 73-21-24-400-801-A	Installation of the T3 Probe
TASK 77-21-21-000-801-A	Removal of the Exhaust Gas Temperature (EGT) Probe
TASK 77-21-21-400-801-A	Installation of the Exhaust Gas Temperature (EGT) Probe
TASK 77-21-61-000-802-A	Removal of the Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05)
TASK 77-21-61-400-802-A	Installation of the Exhaust Gas Temperature (EGT) (T5/T3) Wiring Harness (WC05)
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Detailed Visual Inspection of the Temperature Indicating System

3. Job Set-up
Subtask 77-21-00-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 77-21-00-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 77-21-00-040-051-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser for Ground 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 ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 77-21-00-010-053-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 77-21-00-220-050-A ** ON A/C NOT FOR ALL

A. Do an inspection of the Exhaust Gas Temperature (EGT) wiring harness (WC05) as follows:

CAUTION: DO NOT BEND OR TWIST THE HARNESS TOO MUCH. IF YOU DO, DAMAGE TO THE HARNESS CAN OCCUR.

(1) Disconnect the harness (WC05) self-locking connector (P43) from the wiring harness (W03) receptacle (J43) (Ref. AMM TASK 77-21-61-000-802).
(2) Disconnect the harness (WC05) from the T3 probe (1) (Ref. AMM TASK 77-21-61-000-802).
(3) Disconnect the harness (WC05) from the two left and right EGT T5 probes on the Turbine Exhaust Case (TEC) (Ref. AMM TASK 77-21-61-000-802).
(4) Do an inspection of the harness (WC05) (Ref. AMM TASK 73-21-00-200-805).
(5) Connect the harness (WC05) self-locking connector (P43) to the wiring harness (W03) receptacle (J43) (Ref. AMM TASK 77-21-61-400-802).
(6) Connect the harness (WC05) to the T3 probe (1) (Ref. AMM TASK 77-21-61-400-802).
(7) Connect the harness (WC05) to the two left and right EGT T5 probes (11) on the TEC (Ref. AMM TASK 77-21-61-400-802).

Subtask 77-21-00-220-051-A ** ON A/C NOT FOR ALL

B. Do the inspection of the T3 probe (1) as follows:
(1) Test the T3 probe (1) continuity and insulation resistance with a MULTIMETER - STANDARD. See Table 601

Table 601 - T3 Probe Continuity And Insulation Resistance

EXAMINE	RESULT	DISPOSITION
Continuity between Kp and Kn terminals on Channel A	Less than 5 ohms	If out of limits, replace the T3 Probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Continuity between Kp and Kn terminals on Channel B	Less than 5 ohms	If out of limits, replace the T3 Probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Insulation resistance between both Kp and Kn terminals and T3 probe housing on Channel A	Greater than 100,000 ohms	If out of limits, replace the T3 Probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Insulation resistance between both Kp and Kn terminals and T3 probe housing on Channel B	Greater than 100,000 ohms	If out of limits, replace the T3 Probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).

(2) Remove the T3 probe (1) (Ref. AMM TASK 73-21-24-000-801).
(3) If necessary, clean the T3 probe (1) as follows:
(a) Clean the exterior of the T3 probe (1) as follows:
1 Clean the surfaces of the T3 probe (1) with a solution of tap water and household detergent.
2 If necessary, clean the T3 probe (1) by SPOP 209 (Ref. AMM TASK 70-27-00-910-805) to remove stubborn deposits.
3 Use a P05-126Brush, short bristle nylon to remove large amounts of dirt.
4 Rinse the T3 probe (1) thoroughly with clean tap water.
5 Dry the T3 probe (1) with AIR SOURCE FILTERED, DRY.
(b) Clean the terminal assembly of the T3 probe (1) as follows:
1 Use a lint-free cotton cloth (Material No.P05-005) or non-abrasive cloth wet with isopropyl alcohol (Material No.P11-014) to wipe dust and dirt from the body of the terminal assembly.
2 Wipe dry with a clean and dry lint-free cotton cloth (Material No.P05-005) .
3 Remove dirt from the terminals with a Non-Metallic Soft Bristle Brush (Material No.P05-067) wet with isopropyl alcohol (Material No.P11-014) .
4 Dry the terminals with AIR SOURCE FILTERED, DRY.

NOTE: The T3 probe may show signs of superficial corrosion due to tarnishing of the external surfaces. This condition is normal and does not affect the form, fit, or function of the probe. Cleaning and trying to remove the tarnish is not necessary.

(4) Examine the T3 probe (1). See Table 602

Table 602 - T3 Probe - Inspection

EXAMINE	DAMAGE	DISPOSITION
Corrosion or erosion	Moderate corrosion or erosion is permitted
Deep scratches or dents	All quantities	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Cracking or separation of parts	All quantities	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Nicks	Minor nicks	Permitted
	More than permitted limits	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Housing mounting holes	Cracks or distortion	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Terminals	Bent, loose, or damaged	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
	Thread damage	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
	Foreign object damage or debris	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).
Flange	Bent but does not affect the attachment or sealing features	Permitted
	More than the permitted limits	Not permitted. Replace T3 probe (Ref. AMM TASK 73-21-24-000-801) and (Ref. AMM TASK 73-21-24-400-801).

(5) Install the T3 probe (1) to the diffuser case (Ref. AMM TASK 73-21-24-400-801).

Subtask 77-21-00-220-052-A ** ON A/C NOT FOR ALL

C. Do the inspection of the EGT T5 probe(s) (11) as follows:
(1) Test the EGT T5 probe (11) continuity and insulation resistance with a MULTIMETER - STANDARD. See Table 603

Table 603 - EGT T5 Probe Continuity And Insulation Resistance

EXAMINE	RESULT	DISPOSITION
Continuity between Kp and Kn terminals	Less than 5 ohms	If out of limits, replace the EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
Insulation resistance between both Kp and Kn terminals and T5 probe housing	Greater than 100,000 ohms	If out of limits, replace the EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).

(2) Remove the EGT T5 probe(s) (11) (Ref. AMM TASK 77-21-21-000-801).
(3) If necessary, clean the EGT T5 probe(s) (11) as follows:
(a) Clean the exterior of the EGT T5 probe (11) as follows:
1 Clean the exterior surface with a solution of tap water and household detergent.
2 If necessary, clean the EGT T5 probe(s) (11) by SPOP 209 (Ref. AMM TASK 70-27-00-910-805) to remove stubborn deposits.
3 Use a P05-126Brush, short bristle nylon to remove large amounts of dirt.
4 Rinse the EGT T5 probe (11) thoroughly with clean tap water.
5 Dry the EGT T5 probe (11) with AIR SOURCE FILTERED, DRY.
(b) Clean the terminal assembly of the EGT T5 probe (11) as follows:
1 Use a lint-free cotton cloth (Material No.P05-005) or non-abrasive cloth wet with isopropyl alcohol (Material No.P11-014) to wipe dust and dirt from the body of the terminal assembly.
2 Wipe dry with a clean and dry lint-free cotton cloth (Material No.P05-005) .
3 Remove dirt from the terminals using a Non-Metallic Soft Bristle Brush (Material No.P05-067) wet with isopropyl alcohol (Material No.P11-014) .
4 Dry the terminals with AIR SOURCE FILTERED, DRY.
(4) Examine the EGT T5 probe (11). See Table 604

Table 604 - EGT T5 Probe - Visual Inspection

EXAMINE	DAMAGE	DISPOSITION

Corrosion or erosion	Moderate corrosion or erosion is permitted
Deep scratches or dents	All quantities	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
Cracking or separation of parts	All quantities	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
Nicks	Minor nicks	Permitted
	More than permitted limits	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
Housing mounting holes	Cracks or distortion	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
Terminals	Bent, loose, or damaged	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
	Thread damage	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
	Foreign object damage or debris	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).
Flange	Bent but does not affect the attachment or sealing features	Permitted
	More than the permitted limits	Not permitted. Replace EGT T5 probe (Ref. AMM TASK 77-21-21-000-801) and (Ref. AMM TASK 77-21-21-400-801).

(5) Install the EGT T5 probe(s) (11) (Ref. AMM TASK 77-21-21-400-801).

5. Close-up
Subtask 77-21-00-410-052-A ** ON A/C NOT FOR ALL

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 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 77-21-00-440-051-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 77-21-00-410-053-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:18:53 UTC