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

ST02962AT

Installation of L3 Communications Traffic Alert and Collision Avoidance System Model 791A (TCAS791A). Held by Woven Electronics, LLC, which holds 42 approved modifications in all. Last revised March 23, 2023. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
The Boeing Company; The Boeing Company
Models
DC-6A, DC-6B
Type certificates
6A3, 6A4
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 21, 2026.