We do not currently plan any action to prohibit the use of any particular type of wire insulation in transport category airplanes since service experience has been satisfactory and the military experience is not applicable.  However, if further evidence of a problem is found, we will take action.

      b.   The FAA Technical Center in Atlantic City, New Jersey, has conducted tests on various types of wire insulation.  The draft AC previously discussed is based, in part, on the results of this testing.

The most notable studies of which the FAA is aware are those by the Hookup Wire Insulation Subcommittee of the American Society for Testing and Materials and the British Standards Institution.  In addition, on a national and international basis, Kapton has been the subject of various industry group meetings and studies by the military, equipment manufacturers, and Dupont, the Kapton manufacturer.

      c.   Although there have been instances of electrical faults due to numerous causes in transport category airplanes, few of them have resulted in fires or other hazardous effects.  The significant results of our review of adverse service experience have been incorporated into the draft AC.  Copies of accident reports are not available at this time.  We need more time to provide the information.

       d.   As requested in your letter, a point of contact for further questions is Mr. Henri Branting, Acting Manager, Technical Analysis Branch, Aircraft Engineering Division, Aircraft Certification Service, FAA, Washington, D.C. 20591, telephone 267-9577.

 If I can be of further assistance, please let me know.

Sincerely,

Administrator