Summary
This action withdraws a notice of proposed rulemaking (NPRM) that proposed a new airworthiness directive (AD), applicable to certain Airbus Model A319, A320, and A321 series airplanes. That action would have required replacement of the lightweight tailpipes of the auxiliary power units (APU). Since the issuance of the NPRM, the Federal Aviation Administration (FAA) has received additional information, based on which we have determined that the tailpipes are very light, and that the chances of any injury to persons or damage to equipment from the part being ejected from the APU exhaust duct are minimal. Also, we have determined that 100 percent of the U.S. operators have done the proposed replacement. Accordingly, the proposed rule is withdrawn.