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

TASK 72-21-22-200-801-A
Visual Inspection of the Low Pressure Compressor (LPC) Cover

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 the Low Pressure Compressor (LPC) cover.

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. Work Zones and Access Panels

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

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 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) Cover

3. Job Set-up
Subtask 72-21-22-941-050-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 72-21-22-010-050-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.
(3) Install a MAT - PROTECTIVE in the inlet cowl.

Subtask 72-21-22-010-051-A

C. Get Access
(1) Remove the front spinner (Ref. AMM TASK 72-21-40-000-801).

4. Procedure
Subtask 72-21-22-210-050-A

A. Visual Inspection of Low Pressure Compressor (LPC) Cover (1)

Visual Inspection of the Low Pressure Compressor (LPC) Cover

Look for	MAXIMUM SERVICEABLE LIMITS
1.Visual inspection of all areas
A.Dents	Any amount up to: 0.0098 in. (0.25 mm) in depth 0.098 in. (2.49 mm) in length.
B.Nicks	Any amount up to: 0.0098 in. (0.25 mm) in depth 0.098 in. (2.49 mm) in length.
C.Scratches	Any amount up to: 0.0098 in. (0.25 mm) in depth 0.098 in. (2.49 mm) in length.
2.Visual inspection of area B, seal groove
A.Nicks, dents, scratches	Not serviceable.
3.Visual inspection of diameter E
A.Fretting	Any amount, if diameter E is between 5.60 in. (142.24 mm) and 5.6016 in. (142.28 mm).
B.Pitting	Not serviceable.
4.Visual Inspection of Area F, anti-rotation tang/lug
A.Peening and wear	Any amount, if the dimension J is between 0.378 in. (9.60 mm) and 0.386 in. (9.80 mm).
B.Breaking and distortion	Not serviceable.
5.Visual Inspection of Dimension G, anti-rotation tang/lug
A.Wear	Any amount, if the dimension G is between 0.154 in. (3.91 mm) and 0.161 in. (4.09 mm).
6.Visual inspection of area L, thread
A.Nicks, dents, scratches, bent, worn, torn thread	Not serviceable.

5. Close-up
Subtask 72-21-22-410-051-A

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

Subtask 72-21-22-410-050-A

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

[Rev.10 from 2021] 2026.04.01 02:51:49 UTC