Repair of the Fan Case Acoustic Lining - VRS1827 [IAE]

TASK 72-32-85-350-016-A
Repair of the Fan Case Acoustic Lining - VRS1827

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

CAUTION: BEFORE YOU START THE FILLING REPAIR, MAKE SURE THAT THE TOTAL REPAIR AREA IS NOT MORE THAN 30 PERCENT OF THE FULL CIRCUMFERENTIAL ACOUSTIC LINING AREA. IF IT IS MORE THAN 30 PERCENT, DO NOT DO THE REPAIR. IF YOU DO, DAMAGE TO THE FULL CIRCUMFERENTIAL ACOUSTIC LINING AREA CAN OCCUR.

ZONE: 400
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This task is for V2500-A5 engines.
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	BRUSH - WIRE, ROTARY
No specific	AR	FILM - POLYETHYLENE
No specific	AR	GUN - SEALANT
No specific	AR	KNIFE - PUTTY
No specific	AR	MACHINE - HAND GRINDING, PNEUMATIC
No specific	AR	MAT - WORK
No specific	AR	SCRAPER
No specific	AR	VACUUM CLEANER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-076)	Methyl Ethyl Ketone, Technical grade
(Material No.V02-005)	adhesive tape
(Material No.V02-160)	teflon tape
(Material No.V02-223)	release film
(Material No.V05-016)	garnet paper
(Material No.V05-020)	waterproof silicon carbide
(Material No.V08-006)	filler, two pack
(Material No.V08-024)	sealant
(Material No.V08-125)	sealant
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-30-00-918-010-A	Consumable Materials Index
TASK 72-31-00-000-010-B	Removal of the LP Compressor (Fan) Module
TASK 72-31-00-400-010-B	Installation of the LP Compressor (Fan) Module
TASK 72-31-11-000-010-B	Removal of the LP Compressor Fan Blades
TASK 72-31-11-400-010-C	Installation of the LP Compressor Fan Blades
TASK 72-32-85-300-020-A	Repair by Replacement of the Acoustic Linings - VRS1845
TASK 72-32-85-300-042-A	Repair of the Fan Case - VRS1806 - Post SBE 72-0160
TASK 72-32-85-350-015-A	Repair of the Fan Case - VRS1824 - PRE SBE 72-0160
Filling Repair of the Acoustic Lining
Slots between the Acoustic Linings
Curing Chart of the Filling Material (V08-006)

3. Job Set-up
Subtask 72-32-85-941-082-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 72-32-85-010-074-A ** ON A/C NOT FOR ALL

B. Remove a sufficient number of LP compressor blades and fillers to get access to the repair area (Ref. AMM TASK 72-31-00-000-010) or (Ref. AMM TASK 72-31-11-000-010).

Subtask 72-32-85-941-122-A ** ON A/C NOT FOR ALL

C. Put the Ground Support Equipment in Position
(1) Put the ACCESS PLATFORM 1M(3 FT) in position to give access to the engine.
(2) Put the MAT - WORK in position in the fan case.

NOTE: Make sure that the red warning pennants of the workmat can be seen externally.

NOTE: Make sure that the workmat has sufficient dimensions to give full protection to the lower half of the fan case.

4. Procedure
Subtask 72-32-85-350-087-A ** ON A/C NOT FOR ALL

A. Prepare areas of damaged area

CAUTION: SILICON CARBIDE TYPE WHEELS, STONES AND ABRASIVE PAPERS ARE TO BE USED FOR THIS REPAIR. ALUMINUM OXIDE TYPES MUST NOT BE USED.

CAUTION: THE MATERIAL WILL OXIDIZE AND CRACK IF MECHANICAL CUTTERS ARE USED HEAVILY. THIS HAS OCCURRED IF THE COMPONENT SHOWS DARK STRAW TO BLUE DISCOLORATION. IF AT ANY TIME THIS COLORATION OCCURS THE CASES MUST BE REJECTED

(1) Use adhesive tape (Material No.V02-005) and FILM - POLYETHYLENE or equivalent to protect the engine opening.

NOTE: Make sure that the masking sheet has sufficient dimensions to give full protection to the inlet of the LPC guide vane assembly, outlet of the stage 2.5 bleed duct and inside of the LP stub shaft.

Subtask 72-32-85-350-062-A ** ON A/C NOT FOR ALL

B. Remove all damage from the defective area

Filling Repair of the Acoustic Lining ** ON A/C NOT FOR ALL

WARNING: DO NOT OPERATE WITHOUT SAFETY GOGGLES AND OTHER GUARD EQUIPMENT. FLYING PARTICLES CAN CAUSE INJURY.

CAUTION: THE FAN CASE IS MADE FROM TITANIUM ALLOY AND IS THIN IN SOME AREAS. IF YOU HIT THE FAN CASE WITH A CHISEL OR SCRAPER YOU CAN MAKE IT UNSERVICEABLE.

CAUTION: YOU MUST USE THE CHISEL, SHARP BLADE OR SCRAPER IN A CIRCUMFERENTIAL DIRECTION TO PREVENT THE EDGES OF THE BLADE SCORING THE FAN CASE.

CAUTION: STOP MACHINING AS SOON AS THE FILES, CUTTERS OR MACHINING BITS ARE THROUGH THE PANEL MATERIAL. USE A STOP-MACHINING OR SLEEVE OR OTHER PENETRATION LIMITING DEVICE TO PREVENT DAMAGE TO THE CASING MATERIAL.

CAUTION: DO NOT USE POWERED TOOLS WITH STEEL CHISEL OR SIMILAR BITS.

CAUTION: YOU MUST ALWAYS TRY TO POINT THE CHISEL OR SHARP BLADE PARALLEL WITH THE SURFACE OF THE FAN CASE.

(1) Use the MACHINE - HAND GRINDING, PNEUMATIC and the BRUSH - WIRE, ROTARY to cut away broken pieces from the damaged area or to cut a hole or holes for the injection of filler into the damaged area. Be careful not to cause damage to the inner surface of the fan case assembly.

NOTE: Remove the minimum quantity of material necessary to remove all damage.

(2) Make sure that the remaining skin surface is smooth. All burrs on the edges of cut skin must be removed.
(3) Remove all remaining debris with the VACUUM CLEANER.
(4) If repair area exceeds 30 percent of entire circumferential acoustic lining area, replace the acoustic lining within ten flight hours or five flight cycles, whichever is sooner (Ref. AMM TASK 72-32-85-300-020).

NOTE: Select the acoustic lining to be replaced so that repaired area including previously repaired are less than 30 percent of entire circumferential acoustic lining area.

Subtask 72-32-85-110-052-A ** ON A/C NOT FOR ALL

C. Remove the Grease from the Repair Area
(1) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) , made moist with V01-076Methyl Ethyl Ketone, Technical grade to remove all grease from the repair area.
(2) Immediately dry the repair with a clean, dry air blast.

Subtask 72-32-85-210-131-A ** ON A/C NOT FOR ALL

D. Examine the fan case inner surface of the repair area. If necessary repair any nicks, dents, scratches and gouges (Ref. AMM TASK 72-32-85-300-042) or (Ref. AMM TASK 72-32-85-350-015).

Subtask 72-32-85-340-095-A ** ON A/C NOT FOR ALL

E. Prepare the Filler Material

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

(1) Use V08-006filler, two pack, option 1.
(a) Weigh out 100 parts of blue paste (part B) and 94 parts of white paste (part A).
(b) Mix the two parts together until the color of paste is constant blue. No streaks are permitted.

NOTE: The life of the mixed filler is approximately one hour at 72 deg.F (22 deg.C).

(2) Use sealant (Material No.V08-024) or sealant (Material No.V08-125) , option 2.
(a) Use sealant (Material No.V08-024) or sealant (Material No.V08-125) . This is supplied in several forms. The preferred form is SEMKIT B1/2 (Material No.V08-125), alternative is the tin form (Material No. V08-024).
(b) If using a sealant (Material No.V08-125) , prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
(c) If using a sealant (Material No.V08-024) , measure 75 parts of the base compound and 10 parts of curing compound (accelerator) by weight.
(d) If using a sealant (Material No.V08-024) , knead the two parts together until the paste is a constant color with the putty knife or equivalent. No streaks are permitted.

NOTE: When mixed, the life of the sealant is approximately half an hour at 77 deg.F (25 deg.C).

NOTE: Sealant cure times are with a relative humidity of 50 percent.

Subtask 72-32-85-340-096-A ** ON A/C NOT FOR ALL

F. Apply the V08-006filler, two pack, option 1

Filling Repair of the Acoustic Lining ** ON A/C NOT FOR ALL

Slots between the Acoustic Linings ** ON A/C NOT FOR ALL

(1) Use the GUN - SEALANT to put the filler into the repair area to slightly more than the necessary level. Do NOT put the filler into the slots between the acoustic linings.
(2) When the filler starts to feel hard, remove all unwanted filler.
(3) Use the KNIFE - PUTTY or a SCRAPER to get the burnished effect.
(4) If necessary, apply a small quantity of cold water to the putty knife to get a smooth finish.

NOTE: Do not use too much water because it will cause the filler to plasticize.

(5) Cure the filler:

CAUTION: THE MAXIMUM TEMPERATURE WHICH CAN BE USED TO CURE THE FILLER IS 176 DEG.F (80 DEG.C)

(a) The cure times are given in figure "Curing Chart of Filling Material (V08-006)".

Curing Chart of the Filling Material (V08-006) ** ON A/C NOT FOR ALL

NOTE: The minimum cure time is one hour at 140 deg.F (60 deg.C)

NOTE: The filler will not cure at a temperature of less than 54 deg.F (12 deg.C).

(6) Blend the filler to the contour with garnet paper (Material No.V05-016) , (Ref. AMM TASK 70-30-00-918-010), if necessary.
(7) Remove all unwanted material with the VACUUM CLEANER.

Subtask 72-32-85-340-209-A ** ON A/C NOT FOR ALL

G. Apply sealant Material (when using V08-024 or V08-125 sealant), option 2

Filling Repair of the Acoustic Lining ** ON A/C NOT FOR ALL

Slots between the Acoustic Linings ** ON A/C NOT FOR ALL

(1) Use the GUN - SEALANT to put the V08-024 sealant or V08-125 sealant into the repair area to slightly more than the necessary level.
(2) When the sealant starts to feel hard, remove the unnecessary sealant material.
(3) Place release film (Material No.V02-223) (non-porous) over the repair area and hold it in place with teflon tape (Material No.V02-160) .
(4) Apply pressure to keep contact between the repair area during the sealant cycle with teflon tape (Material No.V02-160) or equivalent, if necessary.
(5) Let the sealant cure.

CAUTION: THE MAXIMUM TEMPERATURE WHICH CAN BE USED TO CURE THE SEALANT IS 120 DEG.F (49 DEG.C)

(a) Let the sealant cure by heating to 113 deg.F (45 deg.C) for approximately 1.5 hours.

NOTE: The minimum cure time is 1.5 hours. Sealant cure times are with a relative humidity of 50 percent.

(6) Remove the release film, teflon tape and applied pressure source from the repair area and remove all the masking materials from the engine.

Subtask 72-32-85-340-097-A ** ON A/C NOT FOR ALL

H. If necessary, fill the slots between the Acoustic Linings.

Slots between the Acoustic Linings ** ON A/C NOT FOR ALL

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

(1) Prepare the sealant material
(a) Use sealant (Material No.V08-024) or sealant (Material No.V08-125) . This is supplied in several forms. The preferred form is SEMKIT B1/2 (Material No. V08-125), alternative is the tinform (Material No. V08-024). (25 deg.C).
(b) If using a sealant (Material No.V08-125) , prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
(c) If using a sealant (Material No.V08-024) , measure 75 parts of the base compound and 10 parts of curing compound (accelerator) by weight.
(d) If using a sealant (Material No.V08-024) , knead the two parts together until the paste is a constant color with the putty knife or equivalent. No streaks are permitted.

NOTE: When mixed, the life of the sealant is approximately half an hour at 77 deg.F (25 deg.C).

NOTE: Sealant cure times are with a relative humidity of 50 percent.

(2) Apply the sealant material:
(a) Put the sealant into the slots with the KNIFE - PUTTY.
(b) When the sealant starts to feel hard, remove all unwanted sealant.
(c) Cure the sealant.

CAUTION: THE MAXIMUM TEMPERATURE WHICH CAN BE USED TO CURE THE SEALANT IS 120 DEG.F (49 DEG.C)

1 Let the sealant cure for 10 hours at 77 deg.F (25 deg.C) or heat to 113 deg.F (45 deg.C) for approximately 1.5 hours.

NOTE: The minimum cure time is 1.5 hours. Sealant cure time is with relative humidity of 50 percent.

(d) If the remaining sealant material after repair exceeds the limit, dress the sealant material with the waterproof silicon carbide (Material No.V05-020) or equivalent.

Subtask 72-32-85-210-086-A ** ON A/C NOT FOR ALL

I. Examine the Repair Area

Filling Repair of the Acoustic Lining ** ON A/C NOT FOR ALL

Slots between the Acoustic Linings ** ON A/C NOT FOR ALL

(1) Make sure that the filler surface is smooth and flat.
(2) Accept a step if it is less than 0.02 in. (0.5 mm).
(3) Visually examine the slots between the acoustic linings.
(4) If necessary, apply more filler and/or sealant.

5. Close-up
Subtask 72-32-85-942-072-A ** ON A/C NOT FOR ALL

A. Remove the Ground Support Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the workmat from the fan case.
(3) Remove the access platform(s).

Subtask 72-32-85-410-076-A ** ON A/C NOT FOR ALL

B. Install the LP compressor blades and fillers (Ref. AMM TASK 72-31-00-400-010) or (Ref. AMM TASK 72-31-11-400-010).

Subtask 72-32-85-942-073-A ** ON A/C NOT FOR ALL

C. Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:01:06 UTC