1. Part 91 Weather Minima (Sec.  91.155)

The FAA is proposing to revise Sec. 91.155 to prescribe visibility minima for helicopters operating under part 91 in Class G airspace. Section 91.155(b)(1) currently requires helicopters operating under VFR, at 1,200 feet or less above the surface, to remain clear of clouds and operate at a speed that permits the pilot adequate opportunity to see any air traffic or obstruction in time to avoid a collision. The FAA is concerned that the current standard does not provide an adequate margin of safety for pilots who may suddenly encounter IMC because of rapidly changing weather. The FAA is also concerned that the "clear of clouds'' standard, without an associated minimum visibility, may encourage "scud running'' in which pilots fly at a continually decreasing altitude to remain clear of lowering clouds in an attempt to stay in VFR conditions.

Consequently, the FAA is proposing a minimum visibility standard of 1/2 statute mile during the day, and 1 statute mile at night, for helicopters operating under VFR at 1,200 feet or less above the surface in Class G airspace. This proposal would provide a greater margin of safety for operators because pilots would be required to maintain a fixed amount of visibility, and would be less likely to suddenly encounter IMC. In addition to the proposed visibility minima, the proposed rule would retain the current requirement to remain clear of

This provision would take effect on the effective date of the final rule.

(2) With respect to helicopters, an operation over water at a horizontal distance of more than 50 nautical miles from the nearest shoreline and more than 50 nautical miles from an off-shore heliport structure.

(2) With respect to helicopters, an operation over water at a horizontal distance of more than 50 nautical miles from the nearest shoreline.