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

SA00194AT

Installation of Appalachian Accessories carbon steel brake discs that have the melonite surface treatment, P/N AA-40. Held by Aviation Products, INC, which holds 64 approved modifications in all. Last revised November 14, 1994. System: landing gear.

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; 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; Chaparral Motors Inc.; Chaparral Motors Inc.; Chaparral Motors Inc.
Models
172, 182G, 182H, 182, 182A, 182B, 182C, 182D, 182E, 182J, 182K, 182L, 182M, 182N, 182P, 182Q, 182F, R172E (USAF T-41D), R172F (USAF T-41D), R172G (USAF T-41C), R172G (USAF T-41D), R172H (USAF T-41D), R172J, R172K, R172E (USAF T-41C), R172E (USAF T-41B), 150, A150L, A152, 152, 177, 177RG, 2T-1A-2, 2T-1A, 2T-1A-1
Type certificates
3A12, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A13, 3A17, 3A17, 3A17, 3A17, 3A17, 3A17, 3A17, 3A17, 3A17, 3A19, 3A19, 3A19, 3A19, A13CE, A20CE, A18EA, A18EA, A18EA
On this site
Cessna 150 7,993 registered
Cessna 152 1,637 registered
Cessna 172 Skyhawk 20,676 registered
Cessna 177 Cardinal 2,158 registered
Cessna 182 Skylane 11,831 registered
Cessna A150 232 registered
Cessna A152 48 registered
Cessna R172 Hawk XP 758 registered
Great Lakes 2 168 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.