ST00970WI-D
Installation of a Collins AHS-3000A Attitude Heading Reference System (AHRS). Held by Duncan Aviation INC, which holds 316 approved modifications in all. Last revised October 27, 2009. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Lockheed Martin Corporation; Lockheed Martin Corporation; Lockheed Martin Corporation; Lockheed Martin Corporation
- Models
- 1329-23A, 1329-23D, 1329-23E, 1329-25
- Type certificates
- 2A15, 2A15, 2A15, 2A15
- On this site
- Lockheed 1329 6 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.