SA522CH

Installation of Aero Ski Manufacturing Co. Model M3000H fixed skis. (172M LANDING GEAR MODIFIED PER STC SA296GL) (172N LANDING GEAR MODIFIED PER STC SA296GL) (175C LANDING GEAR MODIFIED PER STC SA383GL). Held by Aero Ski Manufacturing CO INC, which holds 19 approved modifications in all. Last revised June 27, 1996. 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
Models: 172M, 172B, 172N, 172C, 172K, 172I, 172H (USAF T-41A), 172G, 172F (USAF T-41A), 172E, 172D, 172L, 175C, 175B, 175A, 175, R172K
Type certificates: 3A12, 3A12, 3A12, 3A12, 3A12, 3A12, 3A12, 3A12, 3A12, 3A12, 3A12, 3A12, 3A17, 3A17, 3A17, 3A17, 3A17
On this site: Cessna 172 Skyhawk 20,676 registered
Cessna 175 Skylark 925 registered
Cessna R172 Hawk XP 758 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.