Visual Inspection of the Low Pressure Compressor (LPC) Shaft [CFML]

TASK 72-22-40-210-801-A
Visual Inspection of the Low Pressure Compressor (LPC) Shaft

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.

1. Reason for the Job
This procedure gives criteria for visual inspection of Low Pressure Compressor (LPC) shaft.

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

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	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-40-000-801-A	Removal of the Front Spinner
TASK 72-21-40-400-801-A	Installation of the Front Spinner
Visual Inspection of the Low Pressure Compressor (LPC) Shaft

3. Job Set-up
Subtask 72-22-40-941-050-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).
(3) Put an ACCESS PLATFORM 1M(3 FT) in position.
(4) Install a MAT - PROTECTIVE in the lower half of the inlet cowl.

4. Procedure
Subtask 72-22-40-210-050-A

A. Visual Inspection of Low Pressure Compressor (LPC) Shaft
(1) Remove the front spinner (Ref. AMM TASK 72-21-40-000-801).
(2) Do a visual inspection of the LPC shaft (1):

Table 601: Visual inspection of all non-painted areas

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Dents	Any number up to: - 0.004 in. (0.10 mm) in depth - 0.020 in. (0.51 mm) in length.
Nicks	Any number up to: - 0.004 in. (0.10 mm) in depth - 0.020 in. (0.51 mm) in length.
Scratches	Any number up to: - 0.004 in. (0.10 mm) in depth - 0.020 in. (0.51 mm) in length.
Corrosion, pitting	Not serviceable.
Cracks	Not serviceable.
Metal loss	Not serviceable.

Table 602: Visual inspection of all painted areas

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Nicks, dents, scratches, bent, worn, torn thread	Any amount if parent material not affected.
Corrosion, pitting	Not serviceable.
Cracks	Not serviceable.
Metal loss	Not serviceable.
Missing paint	Any amount if there is a minimum thickness of 0.00138 in. (0.04 mm) remaining.
Peeling, blistering, wear (bending)	Not serviceable.

Table 603: Visual inspection of dimension M, forward anti-rotation lugs

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Fretting	Any amount, if dimension M is between 0.09744 in. (2.47 mm) and 0.10846 in. (2.75 mm).

Table 604: Visual inspection of dimension N, forward anti-rotation lugs

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Nicks, dents, scratches	Any number, if dimension N is between 0.0791 in. (2.01 mm) and 0.0843 in. (2.14 mm).

Table 605: Visual inspection of area A, forward anti-rotation lugs

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
Nicks, dents, scratches	Any number up to: - 0.004 in. (0.10 mm) in depth - 0.020 in. (0.51 mm) in length.
Missing paint	Any amount.

(3) Install the front spinner (Ref. AMM TASK 72-21-40-400-801).

5. Close-up
Subtask 72-22-40-942-050-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the MAT - PROTECTIVE.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:52:14 UTC