Airworthiness Directive · Amendment 39-17517 · Ice protection
AgustaWestland S.p.A. (Agusta) Helicopters
This AD applies to Model AB139 and AW139 helicopters with a Full Icing Protection System (FIPS) installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for Agusta Model AB139 and AW139 helicopters. This AD requires deactivating the Full Icing Protection System (FIPS) and installing a placard next to the FIPS controller stating that flight into known icing is prohibited. This AD is prompted by a report of a fire in the aft avionics bay and the baggage compartment resulting from an Auto Transformer Rectifier Unit internal circuit overload. These actions are intended to prevent a fire, structural damage, and subsequent loss of control of the helicopter.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
Before further flight, deactivate the FIPS, and install a placard with 6 millimeter red letters on a white background next to the FIPS controller that states the following:
“FLIGHT INTO KNOWN ICING IS PROHIBITED.”
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
