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

SA02055AT

Installation of wing tip extension fuel tanks in accordance with Aviation Enterprises (AE) Installation Instructions, Revision D, dated January 13, 2000, or later FAA approved revisions. Installation of wing aerodynamic fences in accordance with AE Drawing No. SKM-FTII, Revision C, dated August 17, 1999, or later FAA approved revisions. Increase in the Maximum Takeoff Gross Weight from 4700 lbs to 5120 lbs. Held by Aviation Enterprises, which holds 16 approved modifications in all. Last revised July 3, 2003. System: airframe structure.

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
Models
337, 337A, 337B, 337C, 337D, 337E, 337F, 337G, 337H, M337B, P337H, T337B, T337C, T337D, T337E, T337F, T337G, T337H, T337H-SP
Type certificates
A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE, A6CE
On this site
Cessna 337 Skymaster 372 registered
Cessna M337 34 registered
Cessna P337 33 registered
Cessna T337 193 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 5, 2026.