SA941NW
Installation of a Pratt and Whitney R985-AN-5 engine with a Hamilton Standard 2D30/6101A-12 propeller, Servair type oil tank, modified air filter and minor tubing changes. Held by Portable Rock Production. Last revised May 19, 1980. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Boeing Airplane Company Wichita Division
- Models
- B75N1 (Navy N2S-3)
- Type certificate
- A-743
- On this site
- Boeing B75 Stearman Kaydet 257 registered
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 20, 2026.