ST01149CH-D
Installation of an AlliedSignal CAS-66A Traffic Alert and Collision Avoidance System (TCAS I). Held by Electrosonics, which holds 76 approved modifications in all. Last revised August 28, 2001. System: instruments and avionics.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Raytheon Aircraft Company; Raytheon Aircraft Company
- Models
- 1900, 1900C (C-12J)
- Type certificates
- A24CE, A24CE
- On this site
- Beechcraft 1900 Airliner 157 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 7, 2026.