Airworthiness Directive · Amendment 39-15363 · ATR Model ATR42-500 Airplanes
ATR Model ATR42-500 Airplanes
This AD applies to ATR Model ATR42-500 series airplanes, certificated in any category; except for airplanes modified in accordance with ATR modification numbers 05117, 05322, and 05791, or ATR Service Bulletin ATR42-25-1034, dated January 24, 2002.
The FAA is adopting a new airworthiness directive (AD) for certain ATR Model ATR42-500 series airplanes. This AD requires removing metallized polyethylene terephtalate (MPET) insulation blankets installed on the left and the right sides of the airplane over frame 24 between stringers 5 and 14. This AD results from reports indicating that burnt spots were found on the MPET insulation blankets installed over frame 24. The actions specified by this AD are intended to ensure that MPET insulation blankets are removed over frame 24. Such MPET insulation blankets, if not removed, could propagate a small fire that is the result of an electrical arc and could lead to a much larger fire.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 15 days after the effective date of this AD, remove the MPET insulation blankets installed on the left and the right sides of the airplane over frame 24 between stringers 5 and 14, in accordance with the Accomplishment Instructions of ATR Service Bulletin ATR42-25-0155, dated April 10, 2007.
