Summary
This action withdraws a notice of proposed rulemaking (NPRM) that proposed a new airworthiness directive (AD), applicable to certain Cessna Model 500, 501, 550, 551, and 560 series airplanes. That action would have required revising the Airplane Flight Manual (AFM) to include requirements for activation of the airframe pneumatic deicing boots. Since the issuance of the NPRM, the Federal Aviation Administration (FAA) has received new data that indicates the AFM revision is unneccessary. Accordingly, the proposed rule is withdrawn.