Local Reconditioning of the Abradable Material- Defects less than 0.12 in. (3 mm) deep and 0.50 sq in (3.2 sq cm) [CFMB]

TASK 72-23-00-300-040-A
Local Reconditioning of the Abradable Material- Defects less than 0.12 in. (3 mm) deep and 0.50 sq in (3.2 sq cm)

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

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

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	1	HEAT SOURCE - RADIANT
No specific	AR	MAT - PROTECTIVE
No specific	AR	SPATULA - NON METALLIC
No specific	AR	VACUUM CLEANER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	acetone
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2011)	stoddard solvent
(Material No.CP2239)	3M 301D
(Material No.CP2297)	RTV 147 A
(Material No.CP2298)	Catalyst 147 B
(Material No.CP2559)	ardrox 552
(Material No.CP2560)	turco ind 79
(Material No.CP2566)	mag-chem teksol
(Material No.CP2584)	degreasol 99 R
(Material No.CP2656)	mag-chem skysol

C. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-00-000-005-A	Removal of the Spinner Front Cone
TASK 72-21-00-000-006-A	Removal of the Spinner Rear Cone
TASK 72-21-00-000-007-A	Removal of the Fan Rotor Blades
TASK 72-21-00-400-005-A	Installation of the Spinner Front Cone
TASK 72-21-00-400-006-A	Installation of the Spinner Rear Cone
TASK 72-21-00-400-007-A	Installation of the Fan Rotor Blades

3. Job Set-up
Subtask 72-23-00-941-078-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 72-23-00-010-089-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
(2) Install MAT - PROTECTIVE in the lower half of the inlet cowl.
(3) Remove the spinner front cone (Ref. AMM TASK 72-21-00-000-005).
(4) Remove the spinner rear cone (Ref. AMM TASK 72-21-00-000-006).
(5) Remove a sufficient number of fan blades to get access to repair area (Ref. AMM TASK 72-21-00-000-007).

4. Procedure
Subtask 72-23-00-320-053-A ** ON A/C NOT FOR ALL

A. Prepare the Repair Area
(1) Remove the damaged area from the abradable shroud, until only an area without damage is there.

NOTE: All oil contaminated areas must be removed.

(2) Make the surface of the repair area rough with an 3M 301D (Material No.CP2239)
(3) Blow the dust out of the shroud or VACUUM CLEANER.

Subtask 72-23-00-110-052-A ** ON A/C NOT FOR ALL

B. Degrease the Area
(1) Clean the area to be repaired with acetone (Material No.CP1039) or stoddard solvent (Material No.CP2011) or ardrox 552 (Material No.CP2559) or turco ind 79 (Material No.CP2560) or mag-chem teksol (Material No.CP2566) or degreasol 99 R (Material No.CP2584) or mag-chem skysol (Material No.CP2656) or isopropyl alcohol (Material No.CP1041) .

Subtask 72-23-00-340-051-A ** ON A/C NOT FOR ALL

C. Prepare the Base and Hardener for the Repair

WARNING: PUT ON PROTECTIVE GLOVES WHEN YOU USE THE BASE AND HARDENER. IF YOU DO NOT OBEY THIS PRECAUTION, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

(1) Mix, by weight, 100 parts of the RTV 147 A (Material No.CP2297) and 10 parts of the Catalyst 147 B (Material No.CP2298) .
(2) Stir the mixture by hand or mechanically until it becomes a homogenous compound.

NOTE: The compound has a pot life of 2 hours after mixing, at ambient temperature.

(3) Apply the compound with a SPATULA - NON METALLIC. Lighthy hit the compound to remove the air bubbles (if any).

NOTE: It is permitted to apply multiple layers of compound. Each layer can have a maximum depth of 0.12 in. (3 mm), if you obey the compound cure time between applications. Layers can be combined to get a total depth of 0.31 in. (8 mm).

Subtask 72-23-00-350-052-A ** ON A/C NOT FOR ALL

D. Cure the Compound with a HEAT SOURCE - RADIANT and obey the curing cycle which follows:
(1) 1 hour at 210 deg.F (98.9 deg.C).
(2) 1/2 hour at 300 deg.F (150 deg.C).

Subtask 72-23-00-320-054-A ** ON A/C NOT FOR ALL

E. Complete the Repair as follows:
(1) Make sure the cured compound is constant in color. Make sure it does not contain air bubbles.
(2) Use an 3M 301D (Material No.CP2239) to make the repaired surface smooth with all adjacent areas of the abradable shroud.
(3) Clean the repair area and the inlet cowl with a VACUUM CLEANER.

5. Close-up
Subtask 72-23-00-410-083-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) Install the fan blades (Ref. AMM TASK 72-21-00-400-007).
(3) Install the spinner rear cone (Ref. AMM TASK 72-21-00-400-006).
(4) Install the spinner front cone (Ref. AMM TASK 72-21-00-400-005).
(5) Remove the protective mats from the inlet cowl.
(6) Remove the access platform(s).
(7) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:41:58 UTC