SA320AL
ONE ONLY STC, S/N 195 AND S/N 231: Installation of Lycoming O-320-A2B engine, McCauley 1A175/GM82 propeller, Cleveland 20-6, 6.00 - 6 main wheel and brake assemblies with 8.50 - 6, 6-ply tires, leaf tail spring with Scott Model 3200 tail wheel assembly, squared wing tips, and miscellaneous other design changes to airplanes S/N 195 and S/N 231. Held by Stol Aviation LLC C/O Tom Csatari, which holds 8 approved modifications in all. Last revised October 31, 2007. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Interstate Engineering & Type Design Company Inc.; Interstate Engineering & Type Design Company Inc.
- Models
- S-1B1 (Army L-6; XL-6), S-1B2
- Type certificates
- A-754, A-754
- On this site
- Interstate S-1 104 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.