- Use of Automobile Gasoline in Agricultural Aircraft
- Date issued
- Office of Primary Responsibility
- ACE-100, Small Airplane Directorate
Sets forth acceptable conditions under which automobile gasoline (autogas) may be used in restricted category agricultural aircraft powered by Pratt and Whitney R-985 and R-1340 radial engines, and being used in agricultural operations under Federal Aviation Regulations Part 137.
- AC 21-21 (PDF)