SA573AL
Install Cleveland wheel assembly 40-28 and Cleveland brake assembly30-18. Held by Stol Aviation LLC C/O Tom Csatari, which holds 8 approved modifications in all. Last revised October 31, 2007. System: landing gear.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Arctic Aircraft Company Inc.; Arctic Aircraft Company Inc.; Arctic Aircraft Company Inc.; Arctic Aircraft Company Inc.
- Models
- S-1A-90F, S-1A-85F, S-1A-65F, S-1A
- Type certificates
- A-737, A-737, A-737, A-737
- On this site
- Arctic Aircraft Co Inc S-1 15 registered
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 21, 2026.