Installation of Acoustical Panels Attachment Screw Locking [CFMB]

TASK 72-23-00-400-044-A
Installation of Acoustical Panels Attachment Screw Locking

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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

1. Reason for the Job
This procedure tells you how to lock acoustical panel screws when the panel cup examined has a hole caused by the screw head. This procedure applies to all acoustical panel screws: fwd, mid and aft. It is necessary to replace panels with damaged cups re-installed by this procedure at the subsequent shop visit.
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 111.3 and 100.7 lbf.in (1.26 and 1.14 m.daN )
No specific	Torque wrench: range to between 139.65 and 126.35 lbf.in (1.58 and 1.43 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2242)	RTV 732
(Material No.CP2266)	RTV 102
(Material No.CP2431)	RTV 730
(Material No.CP5070)	vaseline

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-000-042-A	Removal of the Power Plant
TASK 71-00-00-000-042-A-01	Removal of the Power Plant with the Engine Positioner TWW 75E (MIAG)
TASK 71-00-00-000-042-A-03	Removal of the Power Plant with Jacxson Tool
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 72-23-00-300-045-A	Replacement of the Riveted Self-Locking Nuts for the Attachment of the Forward and/or the Mid Acoustical Panels
TASK 72-23-00-400-043-A	Installation of Acoustical Panels Attachment Screw/Nut Locking
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
SPM 702111
ESM 722302300008

3. Job Set-up
Subtask 72-23-00-941-094-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 72-23-00-010-118-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls: (Ref. AMM TASK 71-13-00-010-040)
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 72-23-00-040-072-A ** ON A/C NOT FOR ALL

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

Subtask 72-23-00-010-119-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR

4. Procedure
Subtask 72-23-00-420-070-A ** ON A/C NOT FOR ALL

A. Locking of Acoustical Panels

CAUTION: COATING SCREWS IS MANDATORY.

(1) If panel cup(s) found pierced, do the procedure that follows:
(a) Remove the bolt.
(b) Clean all damaged cups SPM 702111.
(c) Fill all damaged cups with RTV 732 (Material No.CP2242) or RTV 102 (Material No.CP2266) or RTV 730 (Material No.CP2431)

NOTE: You must install the screw, with only a light layer of vaseline (Material No.CP5070) , a short time after you apply the RTV (before polymerisation).

(2) Apply a layer of vaseline (Material No.CP5070) to the threads of screws that attach the acoustical panels.
(3) Re-install the acoustical panels and screws.

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

(4) 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 72-23-00-400-043).
(b) If the self-locking nut torque is more than 4.5 lbf.in (0.05 m.daN), but less than 31 lbf.in (0.35 m.daN):

TORQUE the screws of forward and middle panels to between 139.65 and 126.35 lbf.in (1.58 and 1.43 m.daN ) ,
TORQUE screws of the aft panels aft to between 111.3 and 100.7 lbf.in (1.26 and 1.14 m.daN ) .

.
(d) 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 screws at the running torque value and add 44 lbf.in (0.50 m.daN).
(e) If the self-locking nut torque is more than 49 lbf.in (0.55 m.daN):

Replace the self-locking nut of the fwd panels (Ref. AMM TASK 72-23-00-300-045).
Remove the engine (Ref. AMM TASK 71-00-00-000-042) and do the engine shop repair procedure ESM 722302300008 to replace the self-locking of the mid and aft panels.

5. Close-up
Subtask 72-23-00-410-109-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 doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 72-23-00-440-066-A ** ON A/C NOT FOR ALL

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

Subtask 72-23-00-410-110-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 12:59:48 UTC