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

SA5356SW-D

Installation of S-TEC manual electric trim system, Model ST-274. Wolters Ind. Complex. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised January 15, 1993. System: flight controls.

What it applies to

Kind of product
Aircraft
Design holder
The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company; The Cessna Aircraft Company
Models
TP206E, TU206F, TU206E, TU206D, TU206C, U206G, U206F, U206E, U206D, U206C, U206B, U206, TU206G, TP206D, TP206C, P206E, P206D, P206C, P206B, P206A, P206, 206, U206A
Type certificates
A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE, A4CE
On this site
Cessna 206 Stationair 213 registered
Cessna P206 Super Skylane 163 registered
Cessna TP206 25 registered
Cessna TU206 344 registered
Cessna U206 Stationair 798 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.