DOC AIRBUS | AMM A320FInstallation of the Aft Acoustical Panels [CFMB]
TASK 72-23-00-400-026-A
Installation of the Aft Acoustical Panels
Self explanatory
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 72-23-00-860-059-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-420-062-A ** ON A/C NOT FOR ALL
(2) Apply a layer of vaseline (Material No.CP5070) on the threads of the aft screws (three screws) (150) that attach the acoustical panel.
PRE SB 72-0071
(3) Visually inspect the aft acoustical panel cup (Ref. AMM TASK 72-23-00-280-007).
(4) If the panel cup is found pierced (Ref. AMM TASK 72-23-00-400-044).
(5) Install the panel assembly on the forward case and attach it with:
(a) Make sure that the two lateral bonded seals are in position.
(b) Although it is not, at this time, mandatory to obey the inspection criterion related to these bonded seals, we recommend them to be in position, in good condition and fully bonded to the panel.
(7) Put the panel (140), with its two bonded seals, on the fan case and the thrust reverser adapter-ring.
(a) Attach it loosely with four screws (130) with vaseline (Material No.CP5070) at the front and in the middle of the acoustical panel, three screws (150) with vaseline (Material No.CP5070) and three nuts (155) at the rear of the acoustical panel.
END OF PRE SB 72-0071
POST SB 72-0071
(8) Before the installation, do a visual inspection of the panel (140) (Ref. AMM TASK 72-23-00-210-004).
(a) Make sure that the two U-shaped seals (145), that are in stand-by on the two (non-removed and adjacent) fan aft acoustical panels, are in good condition.
(b) If not, remove the panel(s) that hold(s) the damaged seal(s) and install a new seal. See the note below.
(a) Engage one seal (145) first, against one of the panel edges, then engage the other seal (145) against the opposite panel edge.
(b) Make sure that the seals (145) are correctly compressed between the panel and the adjacent struts around the panel.
(a) Attach it loosely with four screws (130) with vaseline (Material No.CP5070) at the front and in the middle of the acoustical panel, three screws (150) with vaseline (Material No.CP5070) and three nuts (155) at the rear of the acoustical panel.
END OF POST SB 72-0071
(a) When possible, start to torque with the screw in the middle of the acoustical panels.
(b) Make sure that the screws are not damaged and replace them if necessary.
(c) 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).
(d) If the self-locking nut torque is between 4.5 lbf.in (0.05 m.daN) and 31 lbf.in (0.35 m.daN),
(f) If the self-locking torque is more than 49 lbf.in (0.55 m.daN), remove the engine (Ref. AMM TASK 71-00-00-000-042).
1 Do the engine shop repair procedure to replace the self-locking nutESM 722302300008 .
(12) TORQUE the three nuts (155) to between 111.3 and 100.7 lbf.in (1.26 and 1.14 m.daN )
.
Subtask 72-23-00-420-081-A ** ON A/C NOT FOR ALL
Subtask 72-23-00-410-079-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 12:59:48 UTC
Installation of the Aft Acoustical Panels
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | 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 ) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2242) | RTV 732 |
| (Material No.CP5070) | vaseline |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 210 | CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD |
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| 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 72-23-00-210-004-A | Visual Inspection of the Fan Frame Assembly |
| TASK 72-23-00-280-007-A | Inspection of Aft Acoustical Panels |
| TASK 72-23-00-400-043-A | Installation of Acoustical Panels Attachment Screw/Nut Locking |
| TASK 72-23-00-400-044-A | Installation of Acoustical Panels Attachment Screw 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 706612380024 | |
Aft Acoustical Panel (Configuration 1 and Configuration 2)Subtask 72-23-00-860-059-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) On the center pedestal, on ENG panel 115VU, make sure that the WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND POWER/1(2) is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
Subtask 72-23-00-010-099-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on ENG panel 115VU, make sure that the WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND POWER/1(2) is off.
(b) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.
B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
Subtask 72-23-00-040-068-A ** ON A/C NOT FOR ALL (1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.
C. Make sure that the thrust reverser is unserviceable for maintenance (Ref. AMM TASK 78-30-00-481-041).
4. ProcedureSubtask 72-23-00-420-062-A ** ON A/C NOT FOR ALL
CAUTION:
COATING SCREWS IS MANDATORY.
A. Install the Aft Acoustical Panels as follows (typical, any panel): NOTE: The 12 aft acoustical panels are attached to both the fan inlet case and the thrust reverser adapter-ring, at their aft end.
(1) Apply a layer of vaseline (Material No.CP5070) on the threads of the forward (three screws) and middle (one screw) screws (130) that attach the acoustical panel. (2) Apply a layer of vaseline (Material No.CP5070) on the threads of the aft screws (three screws) (150) that attach the acoustical panel.
PRE SB 72-0071
(3) Visually inspect the aft acoustical panel cup (Ref. AMM TASK 72-23-00-280-007).
(4) If the panel cup is found pierced (Ref. AMM TASK 72-23-00-400-044).
(5) Install the panel assembly on the forward case and attach it with:
- Four screws (130) with vaseline (Material No.CP5070) at the front and in the middle of the acoustical panel
- Three screws (150) with vaseline (Material No.CP5070) and three nuts (155) at the rear of the acoustical panel.
(a) Make sure that the two lateral bonded seals are in position.
(b) Although it is not, at this time, mandatory to obey the inspection criterion related to these bonded seals, we recommend them to be in position, in good condition and fully bonded to the panel.
(7) Put the panel (140), with its two bonded seals, on the fan case and the thrust reverser adapter-ring.
(a) Attach it loosely with four screws (130) with vaseline (Material No.CP5070) at the front and in the middle of the acoustical panel, three screws (150) with vaseline (Material No.CP5070) and three nuts (155) at the rear of the acoustical panel.
END OF PRE SB 72-0071
POST SB 72-0071
(8) Before the installation, do a visual inspection of the panel (140) (Ref. AMM TASK 72-23-00-210-004).
(a) Make sure that the two U-shaped seals (145), that are in stand-by on the two (non-removed and adjacent) fan aft acoustical panels, are in good condition.
(b) If not, remove the panel(s) that hold(s) the damaged seal(s) and install a new seal. See the note below.
NOTE: Refer to the PPIPC (72-23-00) when it is necessary to replace a seal (145). Because of the different strut sizes and clock positions, the seals (145) do not all have the same pre-formed shapes and can thus have different part numbers.
(9) Put the panel (140) in its approximate position on the fan case and the thrust reverser adapter-ring. (a) Engage one seal (145) first, against one of the panel edges, then engage the other seal (145) against the opposite panel edge.
(b) Make sure that the seals (145) are correctly compressed between the panel and the adjacent struts around the panel.
NOTE: It is not easy to get access to some (panel) clock locations. External aid will possibly be necessary to install the seal (145) correctly between the panel and the related struts.
(10) Put the panel (140), with its two U-shaped seals (145), on the fan case and the thrust reverser adapter-ring. (a) Attach it loosely with four screws (130) with vaseline (Material No.CP5070) at the front and in the middle of the acoustical panel, three screws (150) with vaseline (Material No.CP5070) and three nuts (155) at the rear of the acoustical panel.
END OF POST SB 72-0071
CAUTION:
IF YOU USE A PNEUMATIC OR ELECTRICAL SCREWDRIVER TO UNTORQUE AND LOOSEN ALL ACOUSTICAL PANEL SCREWS, MAKE SURE THAT THE SCREWDRIVER SPEED IS NOT MORE THAN 200 RPM. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE ACOUSTICAL PANEL.
(11) Measure the self-locking torque of each nut when you start to tighten the screws (130). (a) When possible, start to torque with the screw in the middle of the acoustical panels.
(b) Make sure that the screws are not damaged and replace them if necessary.
(c) 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).
(d) 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 four forward and middle screws (130) of the panel to between 111.3 and 100.7 lbf.in (1.26 and 1.14 m.daN ) .
(f) If the self-locking torque is more than 49 lbf.in (0.55 m.daN), remove the engine (Ref. AMM TASK 71-00-00-000-042).
1 Do the engine shop repair procedure to replace the self-locking nut
(12) TORQUE the three nuts (155) to between 111.3 and 100.7 lbf.in (1.26 and 1.14 m.daN )
. B. Optional Procedure
(1) Apply RTV 732 on the aft acoustical panels as follows:
5. Close-up(1) Apply RTV 732 on the aft acoustical panels as follows:
CAUTION:
MAKE SURE THAT YOU APPLY MATERIAL RTV 732 AT AN AMBIENT TEMPERATURE OF 59 TO 95 DEG.F (15 TO 35 DEG.C) AND WITH A HYGROMETRY OF 40 TO 70 PERCENT. IF YOU DO NOT OBEY THIS INSTRUCTION, THERE IS A RISK THAT MATERIAL RTV 732 WILL NOT DRY CORRECTLY.
(a) Apply RTV 732 (Material No.CP2242) between the aft acoustical panels and between the aft acoustical panels and the fan frame struts SPM 706612380024. Polish up to the duct profile. Subtask 72-23-00-410-079-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 72-23-00-440-059-A ** ON A/C NOT FOR ALL Subtask 72-23-00-410-088-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.