Great Lakes 2

A welded steel-tube fuselage and wooden wings, all covered in fabric: the construction of the 1930s and 1940s, which makes wood rot and fabric age the inspection items. The design is held under 5 type certificates. The FAA has issued 7 airworthiness directives (orders that owners must comply with) that name this model, most of them about other and general. Operators and repair shops have filed 1 failure report with the FAA since 1996, 1 of them in the last ten years: about 0.6 a year for every 100 aircraft on the register; the system most often named is propeller. 63 approved modifications exist for it, the most by Garmin International INC.

Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.