Airworthiness Directive 98-08-07
one-timeAirworthiness Directives; Pilatus Aircraft Ltd. Model PC-7 Airplanes
What this AD requires
This amendment adopts a new airworthiness directive (AD) that applies to certain Pilatus Aircraft Ltd. (Pilatus) Model PC-7 airplanes. This AD requires replacing the rudder and elevator pivot arms with parts of improved design. This AD results from reports of cracks in the elevator and rudder trim tab pivot arms on the above- referenced airplanes. The actions specified by this AD are intended to prevent failure of the elevator and rudder caused by fatigue cracking of the pivot arms, which could result in reduced airplane controllability and possible loss of control of the airplane.
Which aircraft AD 98-08-07 applies to
Specific model not stated in provided applicability text (SB number 'PC7-55-001' suggests a Pilatus PC-7 series airplane per typical numbering conventions, not independently confirmed). Required upon accumulating 1,000 hours TIS or within next 100 hours TIS after effective date, whichever later: replace the rudder and elevator trim tab pivot arms with improved-design parts per Pilatus SB No. PC7-55-001 Rev 1 (June 20, 1995). Prevents fatigue failure of elevator/rudder trim tab pivot arms from cracks.
Whether AD 98-08-07 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.