SA1794NM
Installation of a Pratt and Whitney R-985-14B, a Hamilton Standard 2D30-6101A-12 propeller, a 10 1/2 x 4 tailwheel with heavy duty axle, D & S supply heater and muff, Beech model 18 exhaust stack, a weatherly model 620 carburetor air box and associated parts. Held by Stuart K Mitzel, which holds 2 approved modifications in all. Last revised March 3, 1983. 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 21, 2026.