Airworthiness Directive 99-24-09
one-timeAirworthiness Directives; Pilatus Aircraft Ltd. Models PC-12 and PC-12/45 Airplanes
What this AD requires
This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft Ltd. (Pilatus) Models PC-12 and PC- 12/45 airplanes. This AD requires modifying the flap inboard attachment fittings through the installation of a reinforcement angle bracket on the inside of the center web of both flap inner attachment fittings. This AD is the result of mandatory continuing airworthiness information (MCAI) issued by the airworthiness authority for Switzerland. The actions specified by this AD are intended to prevent the potential of the inboard flap attachment fittings buckling while operating at full flaps with full power into a head-on wind gust, which could result in loss of control of the airplane.
Which aircraft AD 99-24-09 applies to
Extracted text begins at the standard 'preceding applicability provision' boilerplate; the AD's actual airplane model list precedes this excerpt and was not captured by extraction (Pilatus PC-12 is the known type but is not named in this excerpt). Prevents inboard flap attachment fittings from buckling at full flaps/full power in a head-on wind gust, which could cause loss of control. Requires, within 100 hours TIS, installing a reinforcement angle bracket on the inside of the center web of both flap inner attachment fittings via Modification Kit Number 500.50.12.199, per Pilatus Service Bulletin No. 57-004, dated June 11, 1999. No person may install flap inboard attachment fittings without this kit incorporated as of the effective date.
Whether AD 99-24-09 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.