Summary
We propose to supersede Airworthiness Directive (AD) 99-01-05 R1, which applies to certain aircraft equipped with wing lift struts. AD 99-01-05 R1 currently requires repetitively inspecting the wing lift struts for corrosion; repetitively inspecting the wing lift strut forks for cracks; replacing any corroded wing lift strut; replacing any cracked wing lift strut fork; and repetitively replacing the wing lift strut forks at a specified time for certain airplanes. Since we issued AD 99-01-05 R1, we have determined that additional airplane models should be added to the Applicability section. This proposed AD would retain all requirements of the existing AD. We are proposing this AD to correct the unsafe condition on these products.