Detailed Visual Inspection (DVI) of the Low Pressure Turbine (LPT) 3rd Stage Blades and Outer Air Seals [PW11]

TASK 72-53-00-220-801-A
Detailed Visual Inspection (DVI) of the Low Pressure Turbine (LPT) 3rd Stage Blades and Outer Air Seals

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.

ZONE: 400

1. Reason for the Job
Use this inspection procedure to examine the 3rd stage Low Pressure Turbine (LPT) blade and 3rd stage outer air seals.
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	FLASHLIGHT
No specific	1	GLOVES - COTTON, LINT-FREE, CLEAN

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
Detailed Visual Inspection (DVI) of the Low Pressure Turbine (LPT) 3rd Stage Blades and Outer Air Seals

3. Job Set-up
Subtask 72-53-00-941-058-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)
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure

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

Subtask 72-53-00-220-050-A ** ON A/C NOT FOR ALL

A. Detailed Visual Inspection (DVI) of the Low Pressure Turbine (LPT) 3rd Stage Blades and Outer Air Seals

CAUTION: BEFORE YOU DO THE INSPECTION OF THE LPT 3RD STAGE BLADES, MAKE SURE THAT YOU PUT ON COTTON GLOVES. HAND PERSPIRATION CAN CAUSE DAMAGE TO TITANIUM ALUMINIDE (TiAl) ALLOY BLADES.

(1) Put GLOVES - COTTON, LINT-FREE, CLEAN on your hands before you touch the LPT blades.
(2) Visually inspect the Low Pressure Turbine (LPT) 3rd stage blades and 3rd stage outer air seals for damage. Use a FLASHLIGHT or other light source and look into the engine exhaust.
(a) For this inspection procedure, the permitted damage limits for the 3rd stage LPT blades and 3rd stage outer air seals are listed in Table 601.

Table 601 - LPT 3rd Stage Blades And Outer Air Seals Damage Limits - Visual Inspection

EXAMINE	DAMAGE	DISPOSITION
All areas of the 3rd stage LPT blades that can be seen for:
Cracks and tears	All quantities	Not permitted. Remove the engine from service immediately.
Area A (outer shroud flow-path surfaces) for:
Dents	All quantities with a depth that is more than 0.002 in. (0.051 mm) or a diameter that is less than 30 times its depth	Not permitted. Remove the engine from service immediately.
Nicks	All quantities with a depth that is more than 0.001 in. (0.025 mm) or a separation that is less than 0.24 in. (6.10 mm)	Not permitted. Remove the engine from service immediately.
Pits	All quantities with a depth that is more than 0.002 in. (0.051 mm) or a diameter that is less than 30 times its depth	Not permitted. Remove the engine from service immediately.
Areas B and C for:
Nicks and scratches	All quantities	Not permitted. Remove the engine from service immediately.
Dents and pits	All quantities with a depth that is more than 0.002 in. (0.051 mm) or a diameter that is less than 30 times its depth	Not permitted. Remove the engine from service immediately.
Area D for:
Nicks and scratches	All quantities	Not permitted. Remove the engine from service immediately.
Dents and pits	All quantities with a depth that is more than 0.002 in. (0.051 mm) or a diameter that is less than 30 times its depth	Not permitted. Remove the engine from service immediately.
Area E (inner and outer platform fillet radii) for:
Nicks and scratches	All quantities	Not permitted. Remove the engine from service immediately.
Dents and pits	All quantities with a depth that is more than 0.002 in. (0.051 mm) or a diameter that is less than 30 times its depth	Not permitted. Remove the engine from service immediately.
Area F for:
Dents and pits	All quantities with a depth that is more than 0.002 in. (0.051 mm) or a diameter that is less than 30 times its depth	Not permitted. Remove the engine from service immediately.
Nicks	All quantities with a depth that is more than 0.001 in. (0.025 mm) or a separation that is less than 0.24 in. (6.10 mm)	Not permitted. Remove the engine from service immediately.
NOTE: Sulfidation is identified as a surface that is green to pale blue in color.
LPT 3rd stage outer air seal for:
Damaged or bent cells	A maximum of 3.0 in. (76.20 mm) in total circumferential length of one of the last three rows of cells	Permitted
	More than 3.0 in. (76.20 mm) in total circumferential length of one of the last three rows of cells	Not permitted. Remove the engine from service immediately.
Areas that are not bonded	One area that is not bonded, to a maximum of 30 adjacent cells	Permitted
	More than one area with cells not bonded or an area with more than 30 adjacent cells not bonded	Not permitted. Remove the engine from service immediately.

(3) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 72-53-00-942-053-A ** ON A/C NOT FOR ALL

A. Make sure that the work area is clean and clear of tools and other items.
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 13:01:58 UTC