Visual Inspection of the Low Pressure Turbine (LPT) Rotor and Stator Module [CFML]

TASK 72-58-00-210-801-A
Visual Inspection of the Low Pressure Turbine (LPT) Rotor and Stator Module

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: 400

1. Reason for the Job
This procedure gives criteria for visual inspection of the LPT rotor and stator module.

NOTE: The inspection criteria below are applicable after removal of high metal with hand blending.

NOTE: You can use equivalent alternatives for standard tools, equipment and consumable materials.

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
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 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
LPT Rotor and Stator Module
Low Pressure Turbine Case
Cooling Manifolds

3. Job Set-up
Subtask 72-58-00-941-050-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 a 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 72-58-00-010-050-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 72-58-00-040-050-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 ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-58-00-010-051-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 72-58-00-210-050-A

A. Visual Inspection of the Low Pressure Turbine (LPT) Rotor and Stator Module

LPT Rotor and Stator Module

Low Pressure Turbine Case

Cooling Manifolds

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual inspection of all areas of the borescope plugs (3):
A.Cracks	Not serviceable
B.Worn, bent, torn, missing threads (fully or not)	Not serviceable
C.The deterioration of the locking pin (17)	Not serviceable
D.Thermal coloring	Any amount
2.Visual inspection of the forward flange (4) of the LPT case (1):
A.Cracks in all areas	Not serviceable
B.Nicks, scores, scratches	Nicks up to 0.0050 in. (0.13 mm) in depth Scores and scratches up to 0.00299 in. (0.08 mm) in depth
3.Visual inspection of the aft flange (5) of the LPT case (1):
A.Cracks in all areas	Not serviceable
B.Nicks, scores, scratches	Nicks up to 0.0050 in. (0.13 mm) in depth Scores and scratches up to 0.00299 in. (0.08 mm) in depth
4.Visual inspection of the outer skin (6) of the LPT case (1):
A.Cracks in the parent material	Not serviceable
B.Nicks, dents, scratches	Any number, up to 0.002 in. (0.05 mm) in depth Dent diameter must be greater than ten times its depth.
C.Heat, other discoloration	Any amount, if there are no distortion bulges
D.Wear	Not serviceable
E.Fretting in areas opposite to the cooling manifolds	Up to 0.0011 in. (0.03 mm) in depth
5.Visual inspection of the threaded ports (7) of the LPT case (1):
A.Worn, bent, torn, missing threads	Not serviceable
6.Visual inspection of the brackets (8) of the LPT case (1):
A.Cracks	Not serviceable
B.Broken brackets	Not serviceable
7.Visual inspection of all areas of the cooling manifolds 1 to 4 (2):
A.Cracks in the brazing	Not serviceable
8.Visual inspection of the tubes (9) of the cooling manifolds 1 to 4 (2):
A.Cracks	Not serviceable
B.Scores, scratches	Any number, if there is no tube wall perforation
C.Blocked cooling air holes	Not serviceable
D.Cracks in the braze (15) between the tubes (9) and the box (12)	Not serviceable
E.Rubbing, wear, fretting	Any amount, up to 0.0031 in. (0.08 mm) in depth
F.Dents, collapse	Any number, if there is no tube wall perforation, not more than 0.063 in. (1.60 mm) in depth.
G.Blue coloration	Any amount
9.Visual inspection of the forward lug (10) of the cooling manifolds 1 to 4 (2):
A.Breakage	Not serviceable
B.Cracks on the area brazed to the box (12)	Not serviceable
C.Cracks on other areas	Not serviceable
10.Visual inspection of the rear lug (11) of the cooling manifolds 1 to 4 (2):
A.Breakage	Not serviceable
B.Cracks on the area brazed to the box (12)	Not serviceable
C.Cracks on other areas	Not serviceable
11.Visual inspection of the box (12) of the cooling manifolds 1 to 4 (2):
A.Scratches	Any number, up to 0.0031 in. (0.08 mm) in depth
B.Dents	Any number, up to 0.094 in. (2.39 mm) in depth
12.Visual inspection of the sleeves (13) of the cooling manifolds 1 to 4 (2):
A.Cracks in the braze (14) between the sleeve (13) and the box (12)	Not serviceable
13.Visual inspection of the clamp loops (16) with cushion (17) of the cooling manifolds 1 to 4 (2):
A.Wear of the cushion (17) except between tube (9) and clamp loops (16)	Any amount
B.Wear of cushion or missing cushion (17) between tube (9) and clamp loops (16)	Not serviceable
14.Visual inspection of the tube supports of the cooling manifolds 1 to 4 (18):
A.Cracks at the mounting flanges (19)	Any number, if the supports are not loose
B.Cracks in all other areas	Any number, if the tubes and fasteners are not loose

5. Close-up
Subtask 72-58-00-410-050-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 72-58-00-440-050-A

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

Subtask 72-58-00-410-051-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] 2026.04.01 02:53:56 UTC