ARMY TM 5-6115-61234 NAVY AG-320B0-MME-000 CHAPTER 14 REPAIR COATING INSTRUCTIONS Section I.  INTRODUCTION D-1. Scope.  This appendix lists repair coating instructions  required  to  recoat  metal  parts contained In the TT-10 Gasoline Driven Turbine Engine Section II.  COATING INSTRUCTIONS D-2. Flame Spray Coating Low-Alloy Steel. This appendix lists repair coating instructions required to recoat   metal   parts   contained   in   the   TT-10   Gasoline Driven Turbine Engine a Scope (1) Type This specification covers the procedure for flame spray deposition of a low-alloy steel (2) Application   This    specification    covers    the procedure for flame spray deposition of a low-alloy steel b.   Applicable     Documents     The     latest     Issue     of Aerospace Materials Specifications (AMS) shall apply (1) Material Specifications • Steel wire (item 13, appx B) • Nickel alloy wire (item11 appx B) • Solvent, petroleum (item 5, appx B) (2) Engineering Process Specifications • Vapor  degreasing  In  accordance  with ASTM STP 310 A using solvent (item 4, appx B) • Aluminum oxide grit (item 3, appx B) c.   Requirements. (1) Equipment. Approved metalized equipment designed  to  provide  automatic  gas  pressure  and  wire feed control (2) Coating  Materials  Bond  coating  (item  140, appx B) (3) Coating Alloy.  (Item 13, appx B). d.   Coating Procedure. WARNING Toxic solvent is used for general cleaning Illness or skin    damage    may    be    caused    by    prolonged breathing    of    solvent    fumes    or    excessive    skin contact  with  the  liquid.    Ensure  there  Is  adequate ventilation  and  avoid  open  flame  or  sparks  when using flammable solvent (1) Cleaning.  Parts shall be thoroughly cleaned free  from  grease  oil,  dirt,  or  other  foreign  materials  by vapor  degreasing  using  solvent  (item  4,  appx  B)  or  by washing In petroleum solvent (Item 4, appx B) (2) Masking Parts shall be masked as required to protect areas not designated to be coated Masks may be   steel,   brass,   or   other   suitable   materials   properly protected against adherence of the sprayed coating. (3) Surface Conditioning  Grit blast the masked parts  sufficiently  to  remove  all  metallic  luster  Excessive blasting shall be avoided. (a) Care     must     be     taken     to     prevent contamination  of  the  prepared  surfaces  by  contact  or other  means  If  necessary  to  handle  the  prepared  part, clean  lint-free  gloves  (item  6,  appx  B)  must  be  used Parts shall be spray coated as soon as possible but In no case  longer  than  two  hours  after  surfaces  have  been prepared for coating. (b) Wipe  grit-blasted  surfaces  with  clean, lint-free  rag  (item  7,  appx  B)  dampened  with  acetone (item  1,  appx  B)  or  other  suitable  solvent  just  prior  to spraying Change 4    14-1