SA812NW
Modification consists of moving the mounting of the roll-servo from fuselage station 71.0 to 180.5 and moving the mounting of the pitch servo from station 85.40 to station 233. Held by American Avionics INC, which holds 10 approved modifications in all. Last revised July 25, 1979. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Twin Commander Aircraft LLC
- Models
- 500-B
- Type certificate
- 6A1
- 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.