SA2346CE

Installation of standard range 56 or 62 gallon capacity or long range77 gallon capacity fiberglass fuel tanks in place of original bladder fuel tanks. (180K THRU S/N 18053000 AND LATER; AIRPLANES ORIGINALLLY EQUIPPED WITH BLADDER FUEL TANKS). Held by Hartwig Aircraft Fuel Cell Repair, which holds 25 approved modifications in all. Last revised May 3, 2004. System: fuel system.

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; Textron Aviation Inc.
Models: 180B, 180C, 180K, 180E, 180A, 180F, 180J, 180D, 180H, 180G, 180
Type certificates: 5A6, 5A6, 5A6, 5A6, 5A6, 5A6, 5A6, 5A6, 5A6, 5A6, 5A6
On this site: Cessna 180 Skywagon 2,605 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 13, 2026.