Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters
This amendment adopts a new airworthiness directive (AD) for the Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This action requires replacing a certain part-numbered tail gear box output housing that has 600 or more hours time-in-service (TIS) with an airworthy part. Also, this AD revises the Airworthiness Limitations section of the maintenance manual by reducing the life limit of the tail gear box output housing. This amendment is prompted by the premature failure of the tail gear box output housing during fatigue testing by the manufacturer. The actions specified in this AD are intended to prevent fatigue failure of the tail gear box output housing, loss of tail rotor drive, and subsequent loss of control of the helicopter.
Airworthiness Directives; Turbomeca Artouste III Series Turboshaft Engines
The FAA proposes to supersede an existing airworthiness directive (AD) for Turbomeca Artouste III series turboshaft engines. That AD currently requires smoke emission checks after every ground engine shutdown, and if necessary, additional checks and possibly removing the engine from service. That action also requires inspection of central labyrinths not previously inspected, or not replaced after the engine logged 1,500 operating hours, and, replacement if necessary. That action also requires the removal of injection wheels at a new lower life limit. This proposed AD includes the same requirements as the existing AD, but reduces the compliance time for the initial inspection of the central labyrinth and adds repetitive inspections of the central labyrinth. This proposed AD results from reports and analyses of in-flight engine shutdowns occurring since we issued AD 2002-22-11. We are proposing this AD to prevent injection wheel cracks and excessive central labyrinth wear, which could result in an in- flight engine shutdown.
Notice of Interim Operating Authority Granted to Commercial Air Tour Operators Over National Parks and Tribal Lands Within or Abutting National Parks
On October 25, 2002, the Federal Aviation Administration (FAA) published the final rule for Title 14, Code of Federal Regulations (14 CFR) part 136, National Parks Air Tour Management (67 FR 65662). The rule became effective on January 23, 2003. On January 27, 2005, the FAA published a notice of opportunity for commercial air tour operators granted interim operating authority (IOA) under the National Parks Air Tour Management Act of 2000 (the Act) to review and self-correct annual authorizations (70 FR 3972). based on the responses to that notice, the FAA made some corrections to interim operating authority. The Act also requires the interim operating authority granted under the Act to be published in the Federal Register for notice and the opportunity for comment. This notice fulfills that statutory requirement.
Standard Instrument Approach Procedures, Weather Takeoff Minimums; Miscellaneous Amendments
This amendment establishes, amends, suspends, or revokes Standard Instrument Approach Procedures (SIAPs) and/or Weather Takeoff Minimums for operations at certain airports. These regulatory actions are needed because of the adoption of new or revised criteria, or because of changes occurring in the National Airspace System, such as the commissioning of new navigational facilities, addition of new obstacles, or changes in air traffic requirements. These changes are designed to provide safe and efficient use of the navigable airspace and to promote safe flight operations under instrument flight rules at the affected airports.