SA4-229
1. Removal or original step and installing Retractable step and handle. 2. Installation in accordance with Robert Douthitt s Sheet number 1 to Sheet number 10 and Installation Instructions. Held by American Navion Society, which holds 13 approved modifications in all. Last revised February 11, 2004. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Navion Aircraft Company Ltd.; Navion Aircraft Company Ltd.; Navion Aircraft Company Ltd.
- Models
- Navion A (Army L-17B and L-17C), Navion B, Navion (Army L-17A)
- Type certificates
- A-782, A-782, A-782
- On this site
- Navion NAVION B 42 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 5, 2026.