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AC 43.13-1B 9/8/98 2-4. AIRCRAFT FABRIC-NATURAL. Physical specifications and minimum strength requirements for natural fiber fabric, cotton and linen, used to recover or repair compo nents of an aircraft, are listed in table 2-1. Tear resistance is an important factor when considering aircraft fabric. A test method such as ASTM D 1424 is recommended. Technical Standard Order TSO-C15d, entitled Aircraft Fabric, Grade A (AMS 3806D); and TSO-C14b, Aircraft Fabric, Intermediate Grade (AMS 3804C) current edition, respec tively, describe the minimum standards that all fabric must meet to qualify as aircraft covering material. 2-5. RECOVERING AIRCRAFT. Re cover or repair aircraft with a fabric of equal quality and strength to that used by the original aircraft manufacturer. It is recommended that fabric conforming to TSO-C15d or TSO-C14b be used to recover aircraft originally covered with lower strength fabric conforming to AMS 3802, current edition. NOTE: Recovering or repairing air- craft with any type fabric and/or coating other than the type used by the original aircraft manufacturer is considered a major alteration. Obtain approval from the FAA on fabric and installation data. Cotton and linen rib lacing cord, machine and hand-sewing thread, and finishing tapes should not be used with polyester and glass fabric covering. a. Reinforcing tape minimum tensile strength is listed in table 2-2. Reinforcing tape meeting specification MIL-T-5661, Type I, current edition, is acceptable. Reinforcing tape should have a minimum 40 lb. resistance with out failure when static tested in shear against a single rib lace, or a pull-through resistance when tested against a single-wire clip, rivet, screw, or any other type of fabric-to-rib attachment. Reinforcing tape is used over the rib cab on top of the fabric and for inter-rib bracing. b. Finishing Tape, sometimes referred to as surface tape, should have the same proper ties as the fabric used to cover the aircraft. c. Lacing Cord shall have a minimum breaking strength of 40 lb. Lacing cord meet ing the specifications listed in table 2-2 is ac ceptable. Rib lace cord should have a micro- crystalline fungicidal wax, paraffin-free wax, or beeswax coating, or other approved treat ment to prevent wearing and fraying when pulling through the structure. d. Machine Thread shall have a mini mum breaking strength of 5 lb. Thread meet ing the specifications listed in table 2-2 is ac ceptable. e. Hand-Sewing Thread shall have a minimum breaking strength of 14 lb. Thread meeting the specifications listed in table 2-2, is acceptable. When covering with STC- approved fabric covering material, use the type of sewing thread approved by the STC and manufactured under the specific PMA. f. Flutter Precautions. When re-covering or repairing control surfaces, especially on high performance airplanes, make sure that dynamic and static balances are not adversely affected. Weight distribution and mass bal ance must be considered to preclude to possi bility of induced flutter. 2-6. PREPARATION OF THE STRUC- TURE FOR COVERING. One of the most important items when covering aircraft is the proper preparation of the structure. Before covering, the airframe must be inspected and approved by a FAA-certified mechanic or re pair station. Page 2-2 Par 2-4PDF Image | AFS-640
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