Procedure No. AT 101 – P Rev 4 Original Issue Date: September 19, 1989 Date: 8/1/91 PROCEDURE PREPARATION OF AIRFRAME FOR RECOVERING Prior to recovering obviously the old covering must be removed. Paying close attention during this step can pay great dividends as the recovering progresses. One must attempt to remove the old fabric in tact or in as few pieces as possible as the old fabric can serve as a template for the new i.e, rib stitch spacing, cable exits, positioning of inspection rings and drain grommets. As the fabric is laid back attachments can be removed also. This may mean cutting rib lacing, removal of clips or screws or drilling out rivets.
Fasteners must be removed without stressing the member to which they are attached; don’t try to pull the fabric loose!! On metal structures make certain there is no evidence of rust or corrosion. Check low points on each member as this is where moisture is likely to collect and corrosion begin. Remember, this is one of the last opportunities to correct corrosion conditions. Inspect all control cables, electrical wiring, bolts, etc. and replace anything that is not likely to last another ten years. Inspect bell-cranks, repair and lubricate in accordance with manufacturer’s recommendation. Wooden surfaces must be sanded and coated with Air Tech spar varnish.
Do not use commercial polyurethane varnish typical of that found at hardware or paint stores! Metal surfaces to which primer must be applied must be primed with Air Tech two part epoxy primer. Prior to epoxy primer application surfaces must be cleaned and/or treated according to methods acceptable to the FAA (Refer to FAA AC 43,13 – 1A Chapter 6). Every sharp edge or protruding metal piece must preferably be eliminated or covered with chafing tape. After preparation the airframe must be inspected and approved for cover by an FAA representative or his delegate.
If this inspection can be conducted by the one who will perform the final inspection and authorize the return of the aircraft to service it will accelerate the process.