Fe
deral Aviation
Agen
SUBJECT : GLASS FIBER FABRIC FOR AIRCRAFT
cY
ACNO: 2044
AIRCRAFT
EFFECTIVE :
9/3/M
COVERING
1.
2.
3.
4.
PURPOSE. This circular provides
a
means, but not the sole means for
acceptance
of glass fiber fabric for external covering of aircraft
structure.
REFERENCE REGULATIONS.
FAR’s,
Sections 23.603, 25.603, 27.603,
and 29.603.
BACKGROUND. There has been an increase in the use of glass fiber
fabrics for covering aircraft structure over the past years. While
existing Technical Standard Orders provide
a
basis for the acceptance
of cotton fabrics for aircraft cwering, they do not provide a means
for acceptance of glass fiber fabric.
Past
installations using glass
fiber fabric have received engineering approval by means of Supplemental
Type Certificates.
ACCEPTABLE MEANS OF COMPLIANCE.
(a)
General.
The referenced regulations require that the
materials used in the structure must show suitability
and durability, to be established by
tests
or experience,
and meet approved specifications so as to ensure strength
and
other
properties conforming to the design data.
Fabrics are acceptable in showing compliance with the
referenced regulations if
they
comply with Military
Specifications HIL-C-9084, ML-Y-114OC, and MIL-G-1140
in the untreated condition, have the following proper-
ties,
and are tested in accordance with the methods
listed:
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