7/24/2017: Piper AD 69-13-03 is superseded by AD 2017-15-05 for 940 heater exhaust extension inspection.
6/06/2017: FAA approves my A.M.O.C. for pressure decay testing 900 Series combustion aircraft heaters. Meggitt (Troy) did not supply any testing procedures for the old 900 series heaters, so I came up with Alternative Method Of Compliance, P/N IP-900.