72-22-02 RAZORBACK FABRICS, INC: Amdt. 39-1531 as amended Amendment 39-1541.
Applies to airplanes having wings, tail, or control surfaces covered with fiberglass using the "razorback" method, certificated in all categories. This covering process has been approved by numerous Supplemental Type Certificates and FAA Forms 337 as complying with Advisory Circular 20-44, "Glass Fiber Fabric for Aircraft Covering."
Compliance required within the next fifty hours' time in service after the effective date of this airworthiness directive, unless already accomplished.
To determine if the fabric is attached with plastic coated glass rib stitch cord, inspect the interior of the wings, tail, or control surfaces through inspection openings or by cutting small holes in the fabric. The plastic coating on the rib stitch cord is black in color.
a. If the fabric is attached with the plastic coated rib stitch cord, replace the stitching with MIL-C-5649 cord or FAA approved equivalent before fifty hours' time in service from the effective date of this Airworthiness Directive.
b. If the fabric is attached with MIL-C-5649 cord, or FAA approved equivalent, no further action is required.
c. All work required, including patching holes, may be accomplished in accordance with FAA Advisory Circular 43.13-1. Razorback Fabrics, Inc., Service Bulletin 1-1 dated 3/11/64 covers the same subject.
(NOTE: Copies of Razorback Fabrics, Inc., Service Bulletin 1-1 may be obtained from the company at Manila, Arkansas 72442.)
This supersedes Amendment 39-1531, 37 F.R.
Amendment 39-1531 became effective October 16, 1972.
This amendment 39-1541 becomes effective November 15, 1972.