Installation of the Aft Acoustical Panels [CFMI]

TASK 72-23-00-400-004-A
Installation of the Aft 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 75 and 66 lbf.in (0.85 and 0.75 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2242)	RTV 732

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 72-23-00-280-008-A	Inspection of Aft 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
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
SPM 706612380024
Aft Acoustical Panel
Sealing of the Acoustical Panels

3. Job Set-up
Subtask 72-23-00-860-053-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.

Subtask 72-23-00-010-073-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowls are open: (Ref. AMM TASK 71-13-00-010-040)
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Make sure that the thrust reverser doors are open: (Ref. AMM TASK 78-36-00-010-040)
(5) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(6) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-23-00-040-058-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

4. Procedure
Subtask 72-23-00-420-053-A ** ON A/C NOT FOR ALL

A. Installation of the Aft Acoustical Panels (Typical, any Panel)

NOTE: The aft acoustical panel assy is composed of the acoustical panel plus one skin fillet. You can install this skin fillet with the new acoustical panel.

(1) If necessary, assemble the 1 skin fillet (120) on the acoustical panel (140).

Aft 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 the acoustical panels and to the contact faces below the screw heads.
(2) Do a visual inspection of the aft acoustical panel cup (Ref. AMM TASK 72-23-00-280-008).
(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 forward case, and attach it with the seven screws (130).

NOTE: You must install the 3 longest screws (130) at the aft 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 75 and 66 lbf.in (0.85 and 0.75 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).

Subtask 72-23-00-914-050-A ** ON A/C NOT FOR ALL

B. Apply the sealant RTV 732 (Material No.CP2242) between the acoustical panels, and also between the acoustical panels and the fan frame struts. SPM 706612380024.

Sealing of the Acoustical Panels ** ON A/C NOT FOR ALL

5. Close-up
Subtask 72-23-00-410-053-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) Close the thrust reverser cowl doors: (Ref. AMM TASK 78-36-00-410-040)
(3) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(4) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(5) Remove the access platform(s).

Subtask 72-23-00-440-056-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 72-23-00-410-071-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls: (Ref. AMM TASK 71-13-00-410-040)
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:33:41 UTC