ETSO-C14b

1 Applicability

This ETSO gives the requirements which new models of aircraft fabric, intermediate grade that is manufactured on or after the date of this ETSO must meet in order to be identified with the applicable ETSO marking.

2 Procedures

- 2.1 General

Applicable procedures are detailed in CS-ETSO Subpart A.

- 2.2 Specific

None.

3 Technical Conditions

3.1 Basic

3.1.1 Minimum Performance Standard

Standards set forth in the SAE Aerospace Material Specification (AMS) 3804c 'Cloth Airplane Cotton Mercerized 65lb (290N) Breaking Strength', dated January 1, 1984 as amended and supplemented by this ETSO:

Exceptions:

- (i) Delete from paragraph 2 of SAE AMS 3804c the following: 'the latest issue of Aerospace Material Specification (AMS) shall apply.' - (ii) Compliance with paragraphs 4.2.2.1, 5.2.4, and 8.3 of SAEAMS 3804c is not required.

Additions:

- (i) Paragraph 1.1 of SAEAMS 3804c shall read as follows: Form: This specification covers one strength and one weave of mercerized cotton cloth known as 'airplane cloth'. However, synthetic fabric material, in particular polyester in the greige condition, also may be identified and used as 'airplane cloth' if the fabri c is shown to have certain equivalent properties as cotton cloth. - (ii) Paragraph 1.2 of SAEAMS 3804c shall read as follows: Application. Aircraft with wing loading less than 9 pounds per square foot (psf) and never-exceed speeds 160 miles per hour (mph). Primarily for the external covering of aircraft surfaces, such as wings, fuselage, ailerons, elevators and other airfoil surfaces. - (iii) Replace the word cotton with cotton cloth in paragraph 3.1.1 of SAE AMS 3804c. - (iv) Paragraph 3.1.2 of SAEAMS 3804c shall read as follows: Yarn: The cloth shall be woven from 2-ply combed cotton yarn or synthetic continuous filament yarn.

AIRCRAFT FABRIC, INTERMEDIATE GRADE

ED Decision 2003/10/RM

- (v) Paragraph 3.1.4 of SAEAMS 3804c shall read as follows: Finishing: The cloth shall be uniformly finished in accordance with the best practice for high grade airplane cloth. Finishing of cotton cloth shall consist of washing, framing and calendaring. The calendaring shall be sufficient to lay any nap present and shall provide a smooth even surface. Nap may be removed by singeing. Synthetic cloth shall remain unfinished (greige). - (vi) In addition to the requirements of paragraphs 3.2.1, 3.2.2 and 3.2.5 of SAEAMS 3804c, include the following after each title: (cotton cloth only). - (vii) The first sentence of paragraphs 3.3 of SAEAMS 3804c, shall read as follows: Quality: The cotton fibers and synthetic filament shall be evenly spun into yarns of proper and uniform yarn count, twist and diameter to produce the texture and weight required. - (viii) In addition to the requirements of paragraphs 4.6.1, 4.6.2 and 5.2.2 of SAEAMS 3804c, replace reference to AMS 3804c with ETSO-C14b.

3.2 Specific

None.

4 Marking

- 4.1 General

Requirements for marking are specified in paragraph 5.1 of SAE AMS 3804c.

- 4.2 Specific

None.

5 Availability of Referenced Document

See CS-ETSO Subpart A paragraph 3.