Cadmium Plating Chemical Milling of Aluminum Alloys

Page 110 Part 2 ✈ Chapter 3 - Checklists MRA – 1st Edition September 1998 Part 2 ✈ Chapter 2 - Airworthiness Audit Policy and Procedures References Result they used? A-2 Are the temperature and etch rate of the chemical mill solution analysed and recorded? QPM OK FDG NA A-3 Is there sufficient agitation of the solution to process the parts properly? QPM OK FDG NA A-4 Are parts in preparation for milling suitably racked to minimise gas entrapment? QPM OK FDG NA A-5 Are viscosity checks of the masking solution carried out and recorded? QPM OK FDG NA A-6 Do the operators observe cleanliness and good housekeeping practices throughout the process? QPM OK FDG NA A-7 Are chemically milled parts properly protected from damage? QPM OK FDG NA A-8 Are the internal surfaces of the tubes inspected for a powdery appearance of the coating? QPM OK FDG NA Items Certified – Completed by:

3.8.5 Chemical Conversion Coatings for Aluminum Alodine: Brush

Spraying and Immersion References Result A-1 Are specifications and procedures available and are they used? QPM OK FDG NA A-2 Are parts vapour-degreased prior to alodine application? QPM OK FDG NA Part 2 ✈ Chapter 3 - Checklists Page 111 Part 2 - Airworthiness Audit Policy and Procedures MRA – 1 st Edition September 1998 References Result A-3 Are parts rinsed with deionized water? QPM OK FDG NA A-4 Is the solution concentrate analysed periodically? QPM OK FDG NA A-5 Is the immersion time monitored? QPM OK FDG NA A-6 Are parts visually inspected for a complete coverage of coating? QPM OK FDG NA Items Certified – Completed by:

3.8.6 ChromicSulphuric Acid Anodizing of Aluminum

References Result A-1 Is excess oil or grease removed by vapour degreasing or is an alternative approved method being used? QPM OK FDG NA A-2 Are parts supported in aluminum alloy or titanium racks in such a way so as to facilitate drainage and prevent solution entrapment? QPM OK FDG NA N OTE : Racked parts must be tightly clamped and spaced far enough apart to prevent shading. A-3 Is the anodising current controlled correctly? QPM OK FDG NA A-4 Is post-anodic treatment adequately controlled? QPM OK FDG NA A-5 Are quality control inspections of the equipment conducted regularly? QPM OK FDG NA A-6 Are solutions analysed periodically? QPM OK FDG NA