IFR Altitudes; Miscellaneous Amendments
This amendment adopts miscellaneous amendments to the required IFR (instrument flight rules) altitudes and changeover points for certain Federal airways, jet routes, or direct routes for which a minimum or maximum en route authorized IFR altitude is prescribed. This regulatory action is needed because of changes occurring in the National Airspace System. These changes are designed to provide for the safe and efficient use of the navigable airspace under instrument conditions in the affected areas.
Eighth Meeting: RTCA Special Committee 221: Aircraft Secondary Barriers and Alternative Flight Deck Security Procedures
The FAA is issuing this notice to advise the public of a meeting of RTCA Special Committee 221: Aircraft Secondary Barriers and Alternative Flight Deck Security Procedures
The FAA is amending the airworthiness standards for transport category airplanes concerning flightcrew alerting. These standards update definitions, prioritization, color requirements, and performance for flightcrew alerting to reflect changes in technology and functionality. This amendment adds additional alerting functions, and consolidates and standardizes definitions and regulations for flightcrew warning, caution, and advisory alerting systems. This action will result in harmonized standards between the FAA and the European Aviation Safety Agency.
Airworthiness Directives; Pratt & Whitney (PW) Models PW4074 and PW4077 Turbofan Engines
The FAA proposes to adopt a new airworthiness directive (AD) for PW PW4074 and PW4077 turbofan engines with 15th stage high-pressure compressor (HPC) disks, part number (P/N) 55H615, installed. This proposed AD would require removing the 15th stage HPC disk within 12,000 cycles since new (CSN) or, for any disks that exceed 12,000 CSN after the effective date of this AD using a drawdown plan that includes a borescope inspection (BSI) or eddy current inspection (ECI) of the rim for cracks. This proposed AD results from multiple shop findings of cracked 15th stage HPC disks. We are proposing this AD to prevent cracks from propagating into the bolt hole, which could result in a failure of the 15th stage HPC disk, uncontained engine failure, and damage to the airplane.