Installation of the Mid Acoustical Panels [CFMI]

TASK 72-23-00-400-003-A
Installation of the Mid Acoustical Panels

ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

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)
No specific	Torque wrench: range to between 93 and 85 lbf.in (1.05 and 0.96 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

D. 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 72-23-00-280-009-A	Inspection of Mid Acoustical Panels
TASK 72-23-00-400-042-A	Installation of the Acoustical Panels Attachment Screw/Nut Locking
TASK 72-23-00-400-045-A	Installation of the Acoustical Panels Attachment Screw Locking
Mid Acoustical Panel

3. Job Set-up
Subtask 72-23-00-860-052-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
(4) Make sure that the spinner front cone is removed (Ref. AMM TASK 72-21-00-000-001).
(5) Make sure that the spinner rear cone is removed (Ref. AMM TASK 72-21-00-000-002).
(6) Make sure that the fan rotor blades are removed (Ref. AMM TASK 72-21-00-000-003).

4. Procedure
Subtask 72-23-00-420-052-A ** ON A/C NOT FOR ALL

A. Installation of the Mid Acoustical Panels

NOTE: The mid-acoustical panel assy is composed of the acoustical panel plus the 2 skin fillets. In case of a non-damaged skin fillet, these skin fillets can be reinstalled with the new acoustical panel.

(1) If necessary, assemble the 2 skin fillets (90) on the acoustical panel (110).

Mid Acoustical Panel ** ON A/C NOT FOR ALL

CAUTION: COATING SCREWS IS MANDATORY.

(a) Apply a layer of graphite grease (Material No.CP2101) to the threads of all the screws that attach acoustical panels and to the contact faces below screw heads.
(2) Do a visual inspection of the mid acoustical panel cup (Ref. AMM TASK 72-23-00-280-009).
(3) If the panel cup is found pierced (Ref. AMM TASK 72-23-00-400-045).

CAUTION: DO NOT EXCEED THE SPEED OF 200 RPM TO APPROACH ALL ACOUSTICAL PANEL SCREWS BY USING PNEUMATIC OR ELECTRICAL SCREW DRIVERS.

(4) Install the panel assy on the fan case, and attach it with the 6 screws (100).

NOTE: The longest screws have to be re-installed at the forward end of panel.

NOTE: Whenever possible, start to torque with the screws in the center of the acoustical panels.

(5) Measure the self-locking nut torque of each nut when you start to tighten the screw.

NOTE: Make sure that the screws are not damaged, replace them if necessary.

(a) If the self-locking nut torque is less than 4.5 lbf.in (0.05 m.daN) (Ref. AMM TASK 72-23-00-400-042).
(b) If the self-locking nut torque is between 4.5 lbf.in (0.05 m.daN) and 31 lbf.in (0.35 m.daN), TORQUE the screws to between 93 and 85 lbf.in (1.05 and 0.96 m.daN )

.
(c) If the self-locking nut torque is more than 31 lbf.in (0.35 m.daN), but less than 49 lbf.in (0.55 m.daN), TORQUE the screws at the running torque value and add 44 lbf.in (0.50 m.daN).
(d) If the self-locking nut torque is more than 49 lbf.in (0.55 m.daN), replace the self-locking nut (Ref. AMM D/O 72-23-00-30).

5. Close-up
Subtask 72-23-00-410-052-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).

Subtask 72-23-00-869-051-A ** ON A/C NOT FOR ALL

B. Make sure that the work area is clean and clear of tools and other items.

Subtask 72-23-00-942-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 07:32:40 UTC