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

SA02128AK

Fabrication and installation of Airframes, Inc. Fuselage in accordance with Airframes, Inc. Master Data List AF 18 dated November 10, 1998 or later FAA accepted revision. Held by Airframes Alaska LLC, which holds 8 approved modifications in all. Last revised May 3, 2021. System: airframe structure.

What it applies to

Kind of product
Aircraft
Design holder
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.; 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.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
Models
PA-18S-"135", PA-18-"150", PA-18S-"150", PA-18S, PA-18-"125" (Army L-21A), PA-18"105" (Special), PA-18-"135" (Army L-21B), PA-18S-"125", PA-18S-"105" (Special), PA-18, PA-18A, PA-18AS-125, PA-18A-135, PA-18AS-135, PA-18A-150, PA-18AS-150
Type certificates
1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2, 1A2
On this site
Piper/Cub Crafters PA-18 46 registered
Piper PA-18 Super Cub 3,620 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.