Airworthiness directives › 2020-24-10
AD 2020-24-10 Airworthiness Directives; Aerostar Aircraft Corporation Airplanes
Applicability*9
This AD applies to Aerostar Aircraft Corporation Model PA-60-601P (Aerostar 601P), PA-60-602P (Aerostar 602P), and PA-60-700P (Aerostar 700P) airplanes, all serial numbers, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 10 hours time-in-service after the effective date of this AD, inspect the elevator and aileron balance tubes for corrosion (pitting and flaking) and rust (discoloration) by following steps 1. through 3. of Part I (Inspection) of the Instructions in Aerostar Aircraft Corporation Service Bulletin SB600-138, dated August 30, 2018 (Aerostar SB600-138). For each tube replaced as required by paragraph (h) of this AD, using a borescope, repeat the inspection within 10 years after replacing the tube and thereafter as follows: (1) At intervals not to exceed 10 years as long as no rust is found. (2) At intervals not to exceed 2 years if only rust is found (without any signs of corrosion).
Unsafe condition
This AD was prompted by reports of corrosion on the elevator and aileron balance tubes. The FAA is issuing this AD to detect corrosion on the elevator and aileron balance tubes. The unsafe condition, if not addressed, could result in failure of the aileron and elevator balance tubes, jamming of the aileron and/or elevator balance tubes, and loss of control of the airplane.
Affected ADs
None.
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