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

SA3-424

Installation of Wiparie Skis Model CTF-2200 (Acft Skis) (FluiDyne) (Federal) tail ski on airplanes equipped with Scott Model 3000 tail wheel. Held by F.Atlee Dodge Aircraft Services, which holds 45 approved modifications in all. Last revised February 9, 2023. System: landing gear.

What it applies to

Kind of product
Aircraft
Design holder
American Champion Aircraft Corp.; American Champion Aircraft Corp.; American Champion Aircraft Corp.; American Champion Aircraft Corp.; American Champion Aircraft Corp.; American Champion Aircraft Corp.; American Champion Aircraft Corp.; American Champion Aircraft Corp.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
Models
7AC, 7FC, 7GC, 7EC, 7ACA, 7ECA, 7DC, 11CC, PA-19 (Army L-18C), PA-18, PA-11, J3C-40, PA-12, PA-15
Type certificates
A-759, A-759, A-759, A-759, A-759, A-759, A-759, A-796, 1A2, 1A2, A-691, A-691, A-780, A-800
On this site
American Champion Aircraft 7 Citabria and Champ 429 registered
Piper/Cub Crafters PA-18 46 registered
Piper J-3 Cub 3,806 registered
Piper PA-11 Cub Special 443 registered
Piper PA-12 Super Cruiser 1,247 registered
Piper PA-15 165 registered
Piper PA-19 15 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.