Boeing E75 Stearman Kaydet

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 Stearman: welded steel-tube fuselage, wooden wings, fabric over all of it. The design is held under 1 type certificate (A-743, held by The Boeing Company). The FAA has issued 6 airworthiness directives (orders that owners must comply with) that name this model, most of them about airframe structure. Operators and repair shops have filed 5 failure reports with the FAA since 1995, 1 of them in the last ten years: about 0.3 a year for every 100 aircraft on the register; the system most often named is engine. 45 approved modifications exist for it, the most by Avcomp LLC.

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.