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Wednesday, 12 December 2007 |
7 November 2007
FR Doc E7-21826 - Policy Statement PS-ACE100-2007-002
Federal Aviation Administration (FAA)
FAA announces policy applicable to utility, aerobatic, commuter airplanes and to airships regarding coaxial cables with jackets made of extruded fluorinated ethylene propylene (FEP).
The FAA indicates that these coaxial cables may be installed on these
Part 23 aircraft without further flammability testing, as they already
comply with Part 25 standards. Part 25 requires that the insulation be
self-extinguishing when subjected to the 60-degree test. The FAA says:
“The average burn length may not exceed 3 inches, and the average
flame time after removal of the flame source may not exceed 30 seconds.
Droppings from the test specimen may not continue to flame for more
than the average of 3 seconds after falling. The self-extinguishing
requirements in Part 23 … are the same as Part 25. Therefore, this
coaxial cable meets or exceeds the Part 23 requirements.”
Note that the fire may not exceed 3 inches travel; this is interesting,
because the final rule immediately below uses a 2-inch separation
standard for wiring from critical flight controls as a hedge against
arcing and burning. |
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Last Updated ( Thursday, 17 January 2008 )
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