SA1517SW
Installation of Mitchell automatic flight system model YK384 consisting of yaw damper. Held by Century Flight Systems INC, which holds 765 approved modifications in all. Last revised July 13, 1984. System: flight controls.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Beechcraft Corporation; Beechcraft Corporation; Beechcraft Corporation
- Models
- B90, C90, E90
- Type certificates
- 3A20, 3A20, 3A20
- On this site
- Beechcraft B90 29 registered
Beechcraft C90 King Air C90 607 registered
Beechcraft E-90 King Air E90 146 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.