a. Flight Tests. Section 91.319(b) requires you to show your aircraft is controllable at all its
normal speeds during all the maneuvers you might expect to execute. You must also show it has no
hazardous operating characteristics or design features.
b. Number of Flight Test Hours. The number of hours depends on your aircraft’s characteristics.
See the following table for specific requirements. The FAA inspector may decide you need additional
hours of flight testing beyond those shown in the table to comply with § 91.319(b).
Aircraft Characteristics Required Flight Testing
Type-certificated engine/propeller combination 25 hours
Non-type-certificated engine/propeller combination 40 hours
Gliders, balloons, dirigibles, and ultralight vehicles eligible for
FAA certification
10 hours, including five
takeoffs and landings

 

From AC 20-27F

 

Jeff Edwards