ST00625WI
Installation of an AlliedSignal CAS 66A Traffic Alert and Collision Avoidance System (TCASI). Held by Jetcorp, which holds 38 approved modifications in all. Last revised February 3, 1998. System: other and general.
What it applies to
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.