Transport i infrastruktura · 23/08/2012

Airworthiness Directives; Cessna Aircraft Company

We are revising an earlier proposed airworthiness directive (AD) for all Cessna Aircraft Company (Cessna) Model 402C airplanes modified by Supplemental Type Certificate (STC) SA927NW and Model 414A airplanes modified by STC SA892NW. That NPRM proposed a complete inspection of the flap system and modification of the flap control system. That NPRM was prompted by a report of a Cessna Model 414A airplane modified by STC SA892NW that experienced an asymmetrical flap condition causing an uncommanded roll when the pilot set the flaps to the approach position. This action revises that NPRM by incorporating additional service information that addresses proper rigging procedures and corrective actions following additional inspection procedures. We are proposing this supplemental NPRM to correct the unsafe condition on these products. Since these actions impose an additional burden over that proposed in the NPRM, we are reopening the comment period to allow the public the chance to comment on these proposed changes.