Inspection of Forward Acoustical Panels [CFMB]

TASK 72-23-00-280-005-A
Inspection of Forward 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)-ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 72-23-00-000-009-A	Removal of the Forward Acoustical Panels of the Fan
TASK 72-23-00-300-044-A	Repair of Forward, Mid and Aft Acoustical Panels when Unbonded Cup
TASK 72-23-00-400-009-A	Installation of the Forward Acoustical Panels of the Fan
Fan Acoustical Panels

3. Job Set-up
Subtask 72-23-00-941-090-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).
(4) Put a WARNING NOTICE(S) to tell persons not to start the engine 1(2).
(5) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position at the front of the engine.

4. Procedure
Subtask 72-23-00-350-058-A ** ON A/C NOT FOR ALL

A. Inspection of FWD Acoustical Panels

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.FWD acoustical panels
A.Dents, marks, indentations caused by screw head.	No limits
B.Pierced cups caused by screw head.	Not serviceable	Replace and bond the cups (Ref. AMM TASK 72-23-00-300-044)
C.Unbonded cups.	Not serviceable	Repair the panel (Ref. AMM TASK 72-23-00-300-044) and re-install the panel immediately (Ref. AMM TASK 72-23-00-400-009). Panel must be repaired at next shop visit.
D.Missing cups.	Not serviceable	Replace the panel (Ref. AMM TASK 72-23-00-000-009) and (Ref. AMM TASK 72-23-00-400-009).
E.Missing insert thread	No limits
F.Missing panel	Not serviceable
G.Loose bolts	Not serviceable	Tighten bolts
H.Local collapse of panel inner surface	No limits
J.Subsurface linear impressions or wrinkles	No limits	Serviceable criteria applied on new parts
K.Voids	Five per panel, 2 in. (50.8 mm) apart, 0.12 in. (3 mm) Dia max., 0.012 in. (0.3 mm) max. depth	Serviceable criteria applied on new parts
L.Defects in the protective coating (initial Tedlar film, or paint) such as:
(1)Missing	No limits	Remove the loose material with a sharp blade.
(2)Defects (dents, nicks, tears, flaking) that let show the inner skin	No limits	Remove the loose material with a sharp blade.
M.Inner skin defects, such as:
(1)Superficial defects (dents, nicks, tears, impacts marks) not through the skin	No limits with a total surface area less than 4 square in. (2580 sq mm) per panel	Remove the loose material with a sharp blade.
(2)Defects (tears, cracks, punctures) through the skin	Not serviceable	Replace panel(s) (Ref. AMM TASK 72-23-00-000-009) and (Ref. AMM TASK 72-23-00-400-009).

5. Close-up
Subtask 72-23-00-410-103-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 02:41:53 UTC