Grand Canyon National Park Quiet Aircraft Technology Incentive: Seasonal Relief From Allocations in the Dragon and Zuni Point Corridors
On November 10, 2014, the Federal Aviation Administration (FAA) and the National Park Service (NPS) published in the Federal Register [79 FR 66763-66765] a notice of the agencies' proposal to provide a quiet aircraft technology incentive for commercial air tour operators at Grand Canyon National Park and a request for public comments. Specifically, the agencies proposed to provide seasonal relief from allocations in the Dragon and Zuni Point corridors for commercial air tour operators that convert or have converted to quiet aircraft technology. The FAA and the NPS have reviewed and considered all comments, and have decided to proceed with implementation of the incentive as proposed. This notice describes that decision and responds to the substantive comments received.
Airworthiness Directives; Zodiac Aerotechnics (Formerly Intertechnique Aircraft Systems)
We propose to adopt a new airworthiness directive (AD) for certain Zodiac Aerotechnics (formerly Intertechnique Aircraft Systems) flightcrew oxygen mask regulators as installed on, but not limited to, various transport and small airplanes. This proposed AD was prompted by a report that improper maintenance on oxygen mask regulators was found. This proposed AD would require the identification and replacement of all potentially affected units. This proposed AD also would require installation of a placard and revision of the airplane flight manual to include an operational procedure for use in case of depressurization. We are proposing this AD to detect and correct affected oxygen mask regulators, which could lead to inadequate protection to the affected flightcrew against hypoxia. Hypoxia can start from a headache and drowsiness and lead eventually to unconsciousness with severe consequence in terms of airplane controllability.
Airworthiness Directives; Sikorsky Aircraft Corporation (Type Certificate Previously Held by Schweizer Aircraft Corporation)
We propose to adopt a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model 269A, 269A-1, 269B, 269C, 269C-1, 269D, and TH-55A helicopters. This proposed AD would require repetitively inspecting and lubricating the tail rotor (T/R) driveshaft splined fittings. This proposed AD is prompted by a report that the T/R driveshaft can disconnect due to deterioration of the splined coupling. The proposed actions are intended to detect and prevent excessive wear of the splined coupling, which could lead to failure of the T/R driveshaft and subsequent loss of control of the helicopter.