SA09275AC-D
Installation of S-TEC System 65 Two Axis Automatic Flight Guidance System, Model ST-665. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised September 10, 1997. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Cal Pacific Airmotive Inc.; Cal Pacific Airmotive Inc.
- Models
- Army P-51D, Army P-51K
- Type certificates
- LTC-11, LTC-11
- 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.