DOC AIRBUS | AMM A320FInstallation of the Acoustical Panels Attachment Screw/Nut Locking [CFMI]
TASK 72-23-00-400-042-A
Installation of the Acoustical Panels Attachment Screw/Nut Locking
1. Reason for the Job
This procedure gives task to lock acoustical panel screws when the corresponding self locking nut torque is smaller than the AMM limits. This procedure applies to any acoustical panel screws: fwd, mid and aft. Any screws and corresponding riveted self locking nuts locked per this procedure will have to be changed at first shop visit opportunity.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 72-23-00-941-092-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-420-068-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-410-105-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:33:42 UTC
Installation of the Acoustical Panels Attachment Screw/Nut Locking
1. Reason for the Job
This procedure gives task to lock acoustical panel screws when the corresponding self locking nut torque is smaller than the AMM limits. This procedure applies to any acoustical panel screws: fwd, mid and aft. Any screws and corresponding riveted self locking nuts locked per this procedure will have to be changed at first shop visit opportunity.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2242) | RTV 732 |
| (Material No.CP2266) | RTV 102 |
| (Material No.CP2431) | RTV 730 |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| 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 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 |
Subtask 72-23-00-941-092-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 72-23-00-010-114-A ** ON A/C NOT FOR ALL (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).
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 72-23-00-040-070-A ** ON A/C NOT FOR ALL Subtask 72-23-00-010-115-A ** ON A/C NOT FOR ALL (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.
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(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 72-23-00-420-068-A ** ON A/C NOT FOR ALL
A. Locking of Acoustical Panels.
(1) Remove the screws if the torque of the related self locking nut is less than the 4.45 lbf.in (0.05 m.daN) value.
(2) Clean the screws and the nutsSPM 702111 .
(3) Apply RTV 732 (Material No.CP2242) or RTV 102 (Material No.CP2266) or RTV 730 (Material No.CP2431) on screw threads and below screw heads.
(a) TORQUE the screws of the forward and mid panels to between 93 and 84 lbf.in (1.05 and 0.95 m.daN )
.
(b) TORQUE the screws of the aft panels to between 75 and 66 lbf.in (0.85 and 0.75 m.daN ).
5. Close-up(1) Remove the screws if the torque of the related self locking nut is less than the 4.45 lbf.in (0.05 m.daN) value.
(2) Clean the screws and the nuts
(3) Apply RTV 732 (Material No.CP2242) or RTV 102 (Material No.CP2266) or RTV 730 (Material No.CP2431) on screw threads and below screw heads.
CAUTION:
DO NOT EXCEED THE SPEED OF 200 RPM TO APPROACH AND TORQUE ALL ACOUSTICAL PANEL SCREWS BY USING PNEUMATIC OR ELECTRICAL SCREW DRIVERS.
(4) Re-install screws. (a) TORQUE the screws of the forward and mid panels to between 93 and 84 lbf.in (1.05 and 0.95 m.daN )
. (b) TORQUE the screws of the aft panels to between 75 and 66 lbf.in (0.85 and 0.75 m.daN )
. Subtask 72-23-00-410-105-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 72-23-00-440-064-A ** ON A/C NOT FOR ALL Subtask 72-23-00-410-106-A ** ON A/C NOT FOR ALL (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