Inspection of Mid Acoustical Panels [CFMI]

TASK 72-23-00-280-009-A
Inspection of Mid Acoustical Panels

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP5061)	temporary marking

C. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-00-000-001-A	Removal of the Spinner Front Cone
TASK 72-21-00-000-002-A	Removal of the Spinner Rear Cone
TASK 72-21-00-000-003-A	Removal of the Fan Rotor Blades
TASK 72-21-00-400-001-A	Installation of the Spinner Front Cone
TASK 72-21-00-400-002-A	Installation of the Spinner Rear Cone
TASK 72-21-00-400-003-A	Installation of the Fan Rotor Blades
TASK 72-23-00-000-003-A	Removal of the Mid Acoustical Panels
TASK 72-23-00-300-026-A	Repair of Forward, Mid and Aft Acoustical Panels when Missing Cup
TASK 72-23-00-400-003-A	Installation of the Mid Acoustical Panels
TASK 72-23-00-400-045-A	Installation of the Acoustical Panels Attachment Screw Locking

3. Job Set-up
Subtask 72-23-00-941-101-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 72-23-00-010-128-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 1M(3 FT) in position at the front of the engine.
(2) Remove the spinner front cone (Ref. AMM TASK 72-21-00-000-001).
(3) Remove the spinner rear cone (Ref. AMM TASK 72-21-00-000-002).
(4) Temporarily mark each fan blade from 1 to 36 using temporary marking (Material No.CP5061) .
(5) Remove 3 consecutive fan blades (Ref. AMM TASK 72-21-00-000-003).
To compensate for imbalance caused by the removal of 3 blades, it is recommended to remove 3 blades 180 degrees opposite to those removed before.

4. Procedure
Subtask 72-23-00-350-064-A ** ON A/C NOT FOR ALL

A. Inspection of Mid Acoustical Panels

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Missing protective coating	No limit
2.Superficial cracks in Tedlar film	No limits in number	Do periodical checks of the acoustical panels for delamination
3.Deep cracks from bolt holes	A maximum of 2 thrucracks with 0.6 in. (15.24 mm) max length starting from attachment holes	Do periodical checks of the acoustical panels for delamination
4.Delamination	Not serviceable	Replace panel(s) (Ref. AMM TASK 72-23-00-000-003) and (Ref. AMM TASK 72-23-00-400-003)
5.Nicks, dents or impingement mark	No limits in number
6.Distortion	No limit
7.Pierced cups caused by screw head	Not serviceable	Install the panel (Ref. AMM TASK 72-23-00-400-045)
8.Unbounded cups	Not serviceable	Repair the panel (Ref. AMM TASK 72-23-00-300-026) and re-install the panel immediately (Ref. AMM TASK 72-23-00-400-003).

5. Close-up
Subtask 72-23-00-410-120-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the fan rotor blades at the locations recorded at the removal (Ref. AMM TASK 72-21-00-400-003).
(2) Install the spinner rear cone (Ref. AMM TASK 72-21-00-400-002).
(3) Install the spinner front cone (Ref. AMM TASK 72-21-00-400-001).
(4) Make sure that the work area is clean and clear of tools and other items.
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:58:43 UTC