AVIATION (AIRWORTHINESS DIRECTIVE ON EMERGENCY LOCATOR TRANSMITTERS) / “[F]or certain Honeywell ASCa Inc. emergency locator transmitters (ELTs) installed on various transport category airplanes. … [R]equires various one-time general visual inspections of the ELT transmitter units (TUs), and corrective actions if necessary.… [P]rompted by a fire on a parked and unoccupied airplane; preliminary information indicated combustion in the area of the ELT TU.”

“Airworthiness Directives; Honeywell ASCa Inc. Emergency Locator Transmitters Installed on Various Transport Category Airplanes”

Final Rule; Request for Comments. September 18, 2013.

This has received a certain amount of attention in the industry press.

“Following an event where a fire broke out on a parked and unoccupied aeroplane, the United Kingdom Air Accidents Investigation Branch (AAIB) carried out an investigation to determine the cause of the fire. Although the investigation is still ongoing, preliminary information indicated that there was combustion in the area of the ELT TU. Subsequent to the fire event, inspection of in-service ELT TUs revealed battery wiring installation discrepancies inside the TU that may result in an electrical short. The AAIB noted that in case of an electrical short, the ELT battery could provide the energy for an ignition.”