Summary
We are revising an earlier proposed airworthiness directive (AD) for certain Cessna Aircraft Company (Cessna) Model 525 airplanes equipped with certain part number (P/N) air conditioning (A/C) compressor motors. That NPRM proposed to require inspection of the number of hours on the A/C compressor hour meter, inspection of the logbook, and replacement of the brushes on certain P/N A/C compressor motors or deactivation of the A/C system until replacement of the brushes and also require reporting of aircraft information related to the replacement of the brushes. That NPRM was prompted by reports of smoke and/or fire in the tailcone caused by brushes wearing beyond their limits on the A/C motor. This action revises that NPRM by providing correct steps for deactivation of the A/C compressor motor. 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 reopeningthe comment period to allow the public the chance to comment on these proposed changes.