The Federal Register

Airworthiness Directives; Eurocopter France Model AS 355 N Helicopters

Tue, Jul 1 2008 11:00:00 GMT

We are adopting a new airworthiness directive (AD) for Eurocopter France Model AS 355 N helicopters. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The European Aviation Safety Agency (EASA), the technical agent for France, with which we have a bilateral agreement, states in the MCAI: ``This Airworthiness Directive (AD) is issued because it was found that the power drawn by the starter generators from the engines is above the consumption capacity at altitudes above 3,000 meters, declared for the engines of AS 355 N helicopters. Excessive power consumption of the starter generators reduces the engine surge margin, which can result in engine failure.''

After engine start, the starter generator functions as the normal operational electrical generator. We are issuing this AD to require actions that are intended to address this unsafe condition.

Airworthiness Directives; Viking Air Limited Models DHC-6-1, DHC- 6-100, DHC-6-200, and DHC-6-300 Airplanes

Tue, Jul 1 2008 11:00:00 GMT

We are adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

There have been reports of interrivet cracking on several wing front spar adapter assemblies (P/N C6WM10271) on the horizontal and vertical flanges. It was determined that the cracking was caused by stress corrosion in the short transverse grain initiated by local riveting induced stresses.
We are issuing this AD to require actions to correct the unsafe condition on these products.

Airworthiness Directives; Viking Air Limited Models DHC-6-1, DHC- 6-100, DHC-6-200, and DHC-6-300 Airplanes

Tue, Jul 1 2008 11:00:00 GMT

Service experience indicates that as aircraft become older, they are more likely to exhibit indications of corrosion.
Additionally, the FAA has reviewed the service experience and finds this action to be necessary based upon that service experience. We are issuing this AD to require actions to correct the unsafe condition on these products.

Standard Instrument Approach Procedures, and Takeoff Minimums and Obstacle Departure Procedures; Miscellaneous

Tue, Jul 1 2008 11:00:00 GMT

This Rule establishes, amends, suspends, or revokes STANDARD Instrument Approach Procedures (SIAPs) and associated Takeoff Minimums and Obstacle Departure Procedures 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, adding new obstacles, or changing 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.

Advisory Circulars: Extended Operations (ETOPS) and Polar Operations, AC 121-42B and Extended Operations (ETOPS) and

Tue, Jul 1 2008 11:00:00 GMT

The issuance of Advisory Circular (AC) 121-42B, Extended Operations (ETOPS) and Polar Operations, provides certificate holders with guidance for obtaining operational approval to conduct ETOPS under 14 CFR part 121.

The issuance of AC 13542, Extended Operations (ETOPS) and Operations in the North Polar Area, provides certificate holders with guidance for obtaining operational approval to conduct Extended Operations (ETOPS) under 14 CFR part 135.