Classifications for Types of Operation

Cessna 152 
 The severity of the operation environment needs to be identified to determine the correct inspection program.

                   (a)  first find the category of your airplane’s operation based on average flight length.

                    (b)  find the number of hours and number of landings on the airplane, then find the average flight length based on the formula found below.

Average Flight Length = Number of Flight Hours / Number of Flights

               If the average flight length is less than 30 minutes, then you must use the SEVERE inspection time limits. For airplanes with an average flight length greater than thirty minutes, you must find the severity of the operating environment.

              Airplanes which have engaged in operations at low altitudes such as pipeline patrol, fish or game spotting, aerial applications, police patrol, sightseeing, livestock management etc. more than 30% of its life must use the SEVERE inspection time limits.

              For all other operating environments, inspections should be conducted using the