The U.S. aircraft register, updated daily
Approved modifications · supplemental type certificate · current · amended

ST01866AT

Installation of a Collins Traffic Alert and Collision Avoidance System, along with a Dual Mode-S transponder. Held by General Aerospace, INC, which holds 10 approved modifications in all. Last revised June 21, 2000. System: instruments and avionics.

What it applies to

Kind of product
Aircraft
Design holder
McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation; McDonnell Douglas Corporation
Models
DC-8-61, DC-8-71, DC-8-55, DC-8-50 Series
Type certificates
4A25, 4A25, 4A25, 4A25
On this site
Douglas DC-8 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 22, 2026.