SA3435SW-D
Installation of Century Automatic Flight System Model AK939 consisting of a Century 21 Autopilot. Held by Century Flight Systems INC, which holds 765 approved modifications in all. Last revised August 10, 1986. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- SOCATA; SOCATA
- Models
- TB 10, TB 20
- Type certificates
- A51EU, A51EU
- On this site
- Daher (Socata) TB 10 53 registered
Daher (Socata) TB-20 200 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.