Bob,

At first review, 91.147 applies to AIRPLANES and HELICOPTERS. Per FAR Part 1, AIRPLANES, as used with respect to the certification, ratings, privileges, and limitations of airmen, means a broad classification of aircraft.

In other words, AIRPLANES are not GLIDERS, and GLIDERS are not AIRPLANES. However per Part 1, AIRPLANES and GLIDERS are both AIRCRAFT.

Very subtle, but an important point when reading the regulations. These words show up throughout the regulations. Our job is to note the difference.

Raul Boerner