TASK 70-12-07-120-501 Dry Plastic Blasting

DMC:V2500-00-70-12-07-00A-252A-D|Issue No:003.00|Issue Date:2018-11-01

Export Control

EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.

Copyright

© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).

Applicability

All

Common Information

TASK 70-12-07-120-501 Dry Plastic Blasting

Table of Contents

General

Safety Precautions

Degrease

Abrasive clean

Preserve

General

This blasting process uses a dry plastic blast media. The procedure is used to remove graphite varnish, antigallant compound, paints, sealants or RTV rubber residue from compressor blades, drums, disks and hubs. The removal of large pieces of RTV with a sharp plastic scraper or razor will increase the efficiency of the blasting process.

IAE has found that suction machines are not as effective with plastic media and that pressure machines provide the best results.

Pressure machines with a conical cone design on the bottom of the pressure pot are more effective than machines with a round or flat bottomed pressure pot.

Air pressure greater than what is recommended in this procedure can cause premature breakdown of media and much dust. However, a very long hose can cause a pressure drop at the nozzle.

A worn nozzle reduces the effectivity of the process.

An incorrect blasting angle can reduce the efficiency of the process.

This procedure is recommended in place of the SPM TASK 70-11-04-300-503 for the removal of any remaining silicone rubber.

NOTE

To increase the volume of parts processed, operators should consider automation of the process with baskets and/or fixtures to hold a large number of parts.

NOTE

Be sure to cut away bulk rubber, as necessary, before you do this procedure.

Preliminary Requirements

Pre-Conditions

NONE

Support Equipment

NONE

Consumables, Materials and Expendables

NameManufacturerPart Number / IdentificationQuantityRemark
CoMat 05-067 PLASTIC BLAST MEDIA7CHT8CoMat 05-067
CoMat 05-171 PLASTIC BLAST MEDIAIE479CoMat 05-171
CoMat 05-172 PLASTIC BLAST MEDIA1GM63CoMat 05-172
PLASTIC BLAST MEDIA0209AComat 05-249
CoMat 05-250 PLASTIC BLAST MEDIADM077CoMat 05-250

Spares

NONE

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURER'S MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS INFORMATION SUCH AS, HAZARDOUS INGREDIENTS, PHYSICAL/CHEMICAL CHARACTERISTICS, FIRE, EXPLOSION, REACTIVITY, HEALTH HAZARD DATA, PRECAUTIONS FOR SAFE HANDLING, USE AND CONTROL MEASURES AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

CAUTION

SURFACE TREATMENT (SUCH AS, ABRASIVE BLASTING), IF NOT DONE CORRECTLY, CAN CAUSE A SMEARED SURFACE. THIS MAKES SURFACE DEFECTS NOT EASY TO FIND DURING NON-DESTRUCTIVE INSPECTIONS. DIFFERENT MATERIAL AND PROCESSES WILL SHOW DIFFERENT EFFECTS. THUS IT IS VERY IMPORTANT TO FOLLOW VERY CAREFULLY THE INSTRUCTIONS IN THE STANDARD PRACTICES/PROCESSES MANUAL AND ENGINE MANUAL. IF CAREFULLY DONE, THE APPROVED NON-DESTRUCTIVE INSPECTION (ESPECIALLY FPI) WILL CONTINUE TO HAVE RESULTS THAT ARE VERY ACCURATE.

CAUTION

IT IS NOT PERMITTED TO MIX THE VARIOUS BLASTING MEDIA UNLESS PERMITTED BY A PROCEDURE.

CAUTION

THE USE OF ALTERNATIVE SIZE MEDIA OR MATERIAL TO THOSE SPECIFIED IN THE PROCEDURE IS NOT PERMITTED UNLESS SPECIFIED DIFFERENTLY BY THE ENGINE MANUAL.

CAUTION

THE BLASTING CABINET AND MEDIA USED IN THIS PROCEDURE ON ENGINE PARTS MUST NOT BE USED TO STRIP CADMIUM PLATED PARTS OR CADMIUM PLATED/PAINTED PARTS, SUCH AS LANDING GEAR.

Procedure

    1. SUBTASK 70-12-07-110-051 Degrease the Component

    1. Chemically clean the component before blasting. Refer to the SPM TASK 70-11-03-300-503.

    2. SUBTASK 70-12-07-120-051 Abrasive Clean the Component

      CAUTION

      ALWAYS APPLY MASKING TAPE OR INSTALL THE SPECIAL GUARDS TO THE COMPONENT SURFACES WHICH ARE NOT TO BE BLASTED. DO THIS BEFORE YOU BLAST THE COMPONENT. MAKE SURE NO BLASTING MEDIA GOES INTO THE COMPONENT AND BECOMES CAUGHT.

    1. Mask as required the component surfaces which are not to be blasted. Mask plasma coated airseals.

      2. Set machine air pressure as follows:

      1. For a pressure-type machine, a pressure of 30 to 40 psi (206.8 to 275.8 kPa).

    3. Blast with CoMat 05-067 PLASTIC BLAST MEDIA or CoMat 05-171 PLASTIC BLAST MEDIA or CoMat 05-172 PLASTIC BLAST MEDIA or PLASTIC BLAST MEDIA or CoMat 05-250 PLASTIC BLAST MEDIA. There must be a 3 in. to 4 in. (76 mm to 102 mm) nozzle-to-part distance at a 45 degree to 60 degree angle to the work surface.

    4. Remove all the abrasive media and unwanted material with clean dry compressed air at a pressure of 30 psi (206.8 kPa) maximum.

    5. Remove the masking tape or special guards (if installed).

    6. Visually examine the part for even cleaning and that there is no remaining blasting media or masking.

    3. SUBTASK 70-12-07-620-051 Do the Preservation Procedure

    1. Preserve the parts in a corrosion preventive, as necessary. Refer to the SPM TASK 70-38-05-380-501.

Requirements After Job Completion

Follow-On Conditions

NONE
Change Type:

removes suction type machines from the procedure (REA18VC363)

Manufacturer Code:0209A
Enterprise Name:CONLOG CONTROL LTD
BU Name:CONLOG CONTROL LTD
P.O. Box:P.O. BOX 8
City:30300 ATLIT
Country:ISREAL
Manufacturer Code:1GM63
Enterprise Name:PATENT PLASTICS INC
BU Name:PATENT PLASTICS INC
Street:638 MARYVILLE PIKE
City:KNOXVILLE
State:TN
Zip Code:37920
Country:USA
Phone Number:1-865-470-0122
Fax Number:1-865-693-6007
Manufacturer Code:7CHT8
Enterprise Name:US TECHNOLOGY MEDIA INC
BU Name:US TECHNOLOGY MEDIA INC
Street:509 WATER ST
City:BOLIVAR
State:OHIO
Zip Code:44612
Country:UNITED STATES OF AMERICA
Manufacturer Code:DM077
Enterprise Name:FISCHER GmbH
BU Name:FISCHER GmbH
Street:SCHELDERHUETTE 16
City:DILLENBURG
Zip Code:35687
Country:GERMANY
Manufacturer Code:IE479
Enterprise Name:DELETED,SEE CAGE CODE 4L0S0
BU Name:DELETED,SEE CAGE CODE 4L0S0
Manufacturer Code:7CHT8
Supply Number:CoMat 05-067
Type:sp01
Supply Short Name:CoMat 05-067 PLASTIC BLAST MEDIA
Supply Name:CoMat 05-067 PLASTIC BLAST MEDIA
Specification Groups:
Doc NumberType
PMC 3300 (PW REF)POLYPLUS PRIME
Suppliers:
ManufacturerRemarks
7CHT8
Manufacturer Code:IE479
Supply Number:CoMat 05-171
Type:sp01
Supply Short Name:CoMat 05-171 PLASTIC BLAST MEDIA
Supply Name:CoMat 05-171 PLASTIC BLAST MEDIA
Specification Groups:
Doc NumberType
PMC 3306AMMO 301 3.5 MOH HARDNESS, 12 TO 16 SCREEN SIZE
Suppliers:
ManufacturerRemarks
IE479
Manufacturer Code:1GM63
Supply Number:CoMat 05-172
Type:sp01
Supply Short Name:CoMat 05-172 PLASTIC BLAST MEDIA
Supply Name:CoMat 05-172 PLASTIC BLAST MEDIA
Specification Groups:
Doc NumberType
PMC 3304SFC 1734, TYPE II 3.5 MOH HARDNESS, 12 TO 20 AND 20 TO 30 SCREEN SIZES
Suppliers:
ManufacturerRemarks
1GM63
Manufacturer Code:X222X
Supply Number:CoMat 05-250
Type:sp01
Supply Short Name:CoMat 05-250 PLASTIC BLAST MEDIA
Supply Name:CoMat 05-250 PLASTIC BLAST MEDIA
Specification Groups:
Doc NumberType
WHERE COMAT 05-250 IS SPECIFIED WITH NO ASTERISK OR SUFFIX, USE ONE OF THE COMAT 05-250 LETTER SUFFIX ALTERNATIVE MATERIALS.
Suppliers:
ManufacturerRemarks
X222X
Manufacturer Code:X222X
Supply Number:Comat 05-249
Type:sp01
Supply Short Name:PLASTIC BLAST MEDIA
Supply Name:PLASTIC BLAST MEDIA
Specification Groups:
Doc NumberType
WHERE COMAT 05-249 IS SPECIFIED WITH NO ASTERISK OR SUFFIX, USE ONE OF THE COMAT 05-249 LETTER SUFFIX ALTERNATIVE MATERIALS.
Suppliers:
ManufacturerRemarks
X222X