Federal Aviation Administration, DOT

Pt. 25, App. F

spaschal on DSK3GDR082PROD with CFR

(a) Definitions.
Burnthrough time means the time, in seconds, for the burner flame to penetrate the
test specimen, and/or the time required for
the heat flux to reach 2.0 Btu/ft2sec (2.27 W/
cm2) on the inboard side, at a distance of 12
inches (30.5 cm) from the front surface of the
insulation blanket test frame, whichever is
sooner. The burnthrough time is measured at
the inboard side of each of the insulation
blanket specimens.
Insulation blanket specimen means one of
two specimens positioned in either side of

the test rig, at an angle of 30Section with respect to
vertical.
Specimen set means two insulation blanket
specimens. Both specimens must represent
the same production insulation blanket construction and materials, proportioned to correspond to the specimen size.
(b) Apparatus. (1) The arrangement of the
test apparatus is shown in figures 1 and 2 and
must include the capability of swinging the
burner away from the test specimen during
warm-up.

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