ST02379AT
Installation of a cockpit speaker and aural warning muting system. Held by Raytheon Aircraft Services, INC, which holds 6 approved modifications in all. Last revised August 22, 2001. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company; Raytheon Aircraft Company
- Models
- 65-A90-2 (RU-21B), 65-A90-1 Series, 65-A90-4 (RU-21E), H90 (T-44A), 65-A90-4 Series, 65-A90-1 (JU-21A), C90A, E90, 65-A90-1 (RU-21H), B90, C90, 65-A90-4 (RU-21H), 65-A90-1 (U-21G), 65-A90-1 (U-21A), 65-A90-1 (RU-21A), 65-A90-1 (RU-21D), 65-A90, 65-90, 65-A90-3 (RU-21C)
- Type certificates
- 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20, 3A20
- On this site
- Beechcraft 65 201 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 20, 2026.