HELICOPTER ENROUTE IFR
FEDERAL AVIATION ADMINISTRATION WASHINGTON DC FLIGHT STANDARDS SERVICE
Pagination or Media Count:
An evaluation of pilots flying selected VOR routes was conducted under simulated IFR operation to assess the vertical and lateral flight technical error. Radar flight track tracings and movie film were used to collect data. A statistical analysis of the data shows that stabilized helicopters may be safely operated IFR within 25 12 miles of a VOR station when at least 500 feet of obstruction clearance is provided in the area two nautical miles on each side of the radial providing course guidance with reduced obstruction clearance beyond 2 NM to a maximum lateral distance of 3 NM.
- Terminal Flight Facilities