Replacement of the Fan Exit Fairing (Splitter) Seal [PW11]

TASK 72-21-06-920-801-A
Replacement of the Fan Exit Fairing (Splitter) Seal

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

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

ZONE: 400

1. Reason for the Job
Use this procedure to replace the splitter seal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	SCRAPER - PLASTIC

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth
(Material No.P05-131)	non - metallic grit cloth
(Material No.P09-014)	sealant, silicone rubber
(Material No.P09-027)	sealant, silicone rubber
(Material No.P11-078)	alcohol, isopropyl

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-28-00-910-803-A	SPOP 42 - Chromate Conversion Coating of Aluminum
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 72-21-06-000-801-A	Removal of the Fan Exit Fairing (Splitter)
TASK 72-21-06-400-801-A	Installation of the Fan Exit Fairing (Splitter)
Fan Exit Fairing (Splitter) Seal

3. Job Set-up
Subtask 72-21-06-941-053-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833)

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 72-21-06-920-050-A ** ON A/C NOT FOR ALL

Fan Exit Fairing (Splitter) Seal ** ON A/C NOT FOR ALL

(1) Remove the fan exit fairing from engine (Ref. AMM TASK 72-21-06-000-801).
(2) Remove all remaining sealant with a SCRAPER - PLASTIC.
(3) Remove the sealant from within the bolt hole and countersink.
(4) Sand Area G of splitter seal with a non - metallic grit cloth (Material No.P05-131) to remove sealant residue.
(5) Clean Area G with a lint-free cotton cloth (Material No.P05-005) wet with P11-078alcohol, isopropyl.
(6) Apply a layer of chromate conversion coating on the repaired area and any aluminium surfaces that are unprotected by SPOP 42 (Ref. AMM TASK 70-28-00-910-803).
(7) Cleaning of the repair surface:

CAUTION: LET THE ALCOHOL DRY FOR 20 MINUTES MINIMUM BEFORE YOU APPLY THE BOND SEALANT. IF YOU DO NOT LET THE ALCOHOL DRY, IT CAN CAUSE CONTAMINATION OF THE ADHESIVE BOND.

(a) Let the repair surface air dry for 20 minutes minimum after cleaning with P11-078alcohol, isopropyl.
(8) Installation of new seal:

CAUTION: DO NOT GET MASKING TAPE ON THE BOND SURFACE. IF YOU GET MASKING TAPE ADHESIVE ON THE BOND SURFACE, IT WILL CAUSE CONTAMINATION OF THE SEALANT AND SEPARATION OF THE SEAL DURING ENGINE OPERATION.

(a) Install the new seal on the splitter seal with masking tape or clamps.
(9) Cut the seal to get the 0.04 in. (1.02 mm) maximum space between the ends of the seal.
(10) Put the seal into position so that the space is not aligned with the notch, Area E.
(11) Remove the masking tape, clamps and seal.
(12) Clean the seal in Area F with a clean lint-free cotton cloth (Material No.P05-005) wet with P11-078alcohol, isopropyl.
(13) Sand the fairing and seal segment bond surfaces lightly with a non - metallic grit cloth (Material No.P05-131) to remove gloss.
(14) Clean the seal and fairing bond surfaces, in Area F and Area G, with a clean lint-free cotton cloth (Material No.P05-005) wet with P11-078alcohol, isopropyl.
(15) Cleaning of bond surfaces:

CAUTION: LET THE ALCOHOL DRY FOR 20 MINUTES MINIMUM BEFORE YOU APPLY THE BOND SEALANT. IF YOU DO NOT LET THE ALCOHOL DRY, IT CAN CAUSE CONTAMINATION OF THE ADHESIVE BOND.

(a) Let the bond surfaces dry for 20 minutes minimum after you clean them.
(16) Application of silicon sealant:

CAUTION: MAKE SURE THAT YOU APPLY THE BOND SEALANT IN AN AREA THAT HAS NO OIL, FUMES OR DUST. ALL MATERIALS, TOOLING, FIXTURES AND HANDLING EQUIPMENT MUST HAVE NO CONTAMINATION. IF YOU DO NOT BOND IN A CLEAN AREA, THERE CAN BE CONTAMINATION OF THE ADHESIVE BOND.

CAUTION: CURE THE SEALANT UNDER CONDITIONS OF A MINIMUM OF 50 PERCENT RELATIVE HUMIDITY AND TEMPERATURE OF 21 - 35 DEG. C (70 - 95 DEG. F). IF YOU DO NOT BOND IN THE CORRECT CONDITIONS, THE ADHESIVE BOND WILL NOT BE STRONG.

(a) Apply P09-014sealant, silicone rubber or P09-027sealant, silicone rubber to cover the bond surface of the fitting:
1 Install the seal on the fairing assembly. Make sure that the seal is installed at the necessary locations.
(17) Apply P09-014sealant, silicone rubber or P09-027sealant, silicone rubber to cover the bond surface of the fitting:
(a) Install the seal to the fairing assembly. Make sure that the seal is installed at the necessary locations.
(18) Apply P09-014sealant, silicone rubber or P09-027sealant, silicone rubber to fully cover the ends of the seal:
(a) Bond the ends of the seal.
(19) Put the seal in position as follows:

CAUTION: MAKE SURE THAT THE CLAMPS ARE NOT TOO TIGHT. IF THEY ARE TOO TIGHT, TOO MUCH SEALANT WILL COME OUT.

(a) Hold the seal in position with clamps or masking tape.

NOTE: The sealant must be visible around all the edges and at the gap between the ends of the seal.

(20) Make the sealant smooth at the forward and aft edges where it bonds to the fairing.
(21) Cure the sealant for a minimum of 24 hours at room temperature and a minimum of 50 percent relative humidity.
(22) Remove the clamps or masking tape.
(23) Install the fan exit fairing on engine (Ref. AMM TASK 72-21-06-400-801).
(24) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 72-21-06-860-052-A ** ON A/C NOT FOR ALL

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 02:48:51 UTC