The estimated cost I have been quoted is $70,000 for compliance with this AD. Time for completion is estimated at 6 weeks. With only 10 or so service centers avaliable and 275 aircraft, it will take years to perfom this AD. My suggestion is to give additional time to perform over the 12 month period or a substantial portion of the fleet will be grounded.
William I. Smith
This is comment on Rule
Airworthiness Directives; Twin Commander Aircraft Corporation Models 690, 690A, and 690B Airplanes
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