SA3149SW-D
Installation of Mitcnell Automatic Flight System Model AK536 consisting of a Century IV Autopilot or Model AK536FD consisting of a Century IV Flight Director Autopilot with Optional Remote Annunciator. Held by Century Flight Systems INC, which holds 765 approved modifications in all. Last revised June 6, 1984. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Textron Aviation Inc.; Textron Aviation Inc.; Textron Aviation Inc.; Textron Aviation Inc.; Textron Aviation Inc.
- Models
- 337E, 337F, 337G, 337H, T337H
- Type certificates
- A6CE, A6CE, A6CE, A6CE, A6CE
- On this site
- Cessna T337 193 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.