Acoustic Shroud - Local or Full Rebond of the Elastomer Acoustic Shroud Rear Seal [CFML]

TASK 72-23-03-300-801-A
Acoustic Shroud - Local or Full Rebond of the Elastomer Acoustic Shroud Rear Seal

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.

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

1. Reason for the Job
This repair procedure gives instructions to do local or full rebond of the elastomer acoustic shroud rear seal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	AIR SOURCE FILTERED, DRY
No specific	1	GUN - SPRAY
No specific	1	SCALPEL
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2244)	primer 1200
(Material No.CP2344)	adhesive
(Material No.CP2772)	abrasive cloth
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
1	ELASTOMER SEAL	EIPC 72-00-01-54-041

D. Referenced Information

REFERENCE	DESIGNATION
Acoustic Shroud - Replacement and Bonding Position of Elastomer Seal

3. Job Set-up
Subtask 72-23-03-941-053-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

4. Procedure
Subtask 72-23-03-350-050-A

A. Rebond of the Elastomer Acoustic Shroud Rear Seal
(1) Remove the unbonded or worn elastomer seal (1).

WARNING: USE PROTECTIVE GLOVES TO PREVENT INJURY FROM SHARP EDGES AND ROUGH SURFACES.

CAUTION: WHEN YOU REMOVE THE SILICONE SEAL, BE CAREFUL NOT TO TOUCH THE CARBON FIBER PLIES. IF YOU DO, DAMAGE TO THE PART WILL OCCUR.

(a) Remove the unbonded or worn elastomer seal (1) and remaining silicone seal with a SCALPEL.
(2) Bond the new elastomer seal (1).
(3) Degrease the part with a Textile-Lint free Cotton - (Material No.14SBA1) moist in isopropyl alcohol (Material No.CP1041) .
(4) Make both surfaces to be bonded rough with an abrasive cloth (Material No.CP2772) in criss-cross pattern.
(5) Blowing of the surfaces

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS
DO NOT LET THE PRESSURE BE MORE THAN 30 PSIG (200 KPA).

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

(a) Blow the surfaces to bond with a AIR SOURCE FILTERED, DRY and de-oiled.
(6) Application of the primer

CAUTION: MAKE SURE THAT YOU APPLY PRIMER 1200 OS IN THE GOOD CONFIGURATION 1 OR 2. IF YOU DO NOT, DAMAGE TO THE EQUIPMENT CAN OCCUR.

(a) Apply primer 1200 (Material No.CP2244) on the carbon fiber ply and on the seal.
(b) Let the temperature to stabilize at ambient.
(c) Apply primer 1200 (Material No.CP2244) on both surfaces to bond with a GUN - SPRAY.

NOTE: You must respect the following conditions:

Temperature above 59 deg.F (15.00 deg.C)
Humidity between 40 percent and 70 percent.

(d) Let primer 1200 (Material No.CP2244) dry for 30 minutes.
(7) Application of the RTV3145 on the primer

CAUTION: MAKE SURE THAT YOU APPLY RTV3145 IN THE GOOD CONFIGURATION 1 OR 2. IF YOU DO NOT, DAMAGE TO THE EQUIPMENT CAN OCCUR.

(a) Apply adhesive (Material No.CP2344) on the primer 1200 (Material No.CP2244) of the acoustic shroud.
(b) Let the temperature to stabilize at ambient.
(c) Apply adhesive (Material No.CP2344) on the acoustic shroud.

NOTE: The thickness of the RTV must be approximately 0.020 in. (0.51 mm).

NOTE: You must respect the following conditions:

Temperature above 59 deg.F (15.00 deg.C),
Humidity between 40 percent and 70 percent.

(8) Bonding of the new EIPC 72-00-01-54-041 ELASTOMER SEAL (1).

CAUTION: MAKE SURE THAT YOU BOND THE SEAL IN THE GOOD CONFIGURATION 1 OR 2. IF YOU DO NOT, DAMAGE TO THE EQUIPMENT CAN OCCUR.

(a) Bond the new elastomer seal (1) on the adhesive (Material No.CP2344) and maintain the elastomer seal with a mechanical way during the polymerization respecting the dimensional limits and dimensions below. See the sheet 2 of the figure.
1 DIM A
Minimum Finish Dimension: 0.197 in. (5.00 mm)
Maximum Finish Dimension: 0.205 in. (5.21 mm)
2 DIM B
Minimum Finish Dimension: 0.55 in. (13.97 mm)
Maximum Finish Dimension: 0.63 in. (16.00 mm)

NOTE: You must respect the following conditions:

Temperature above 59 deg.F (15.00 deg.C)
Humidity between 40 percent and 70 percent.

(9) Let polymerize during 24 hours at ambient temperature.

NOTE: You must respect the following conditions:

Temperature above 59 deg.F (15.00 deg.C)
Humidity between 40 percent and 70 percent.

(10) Make sure that the new elastomer seal (1) is bonded.
(a) The cumulated gaps between each seal sector must not be more than 0.20 in. (5.08 mm).
(b) The gaps between each seal sector must not be more than 0.04 in. (1.02 mm).

5. Close-up
Subtask 72-23-03-942-051-A

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:52:23 UTC