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

SA1221GL

Installation of fuel quick drain at lower end of accumulator tank at fuselage station 8.12. Held by Eagle Aviation, INC. Last revised May 23, 1988. System: airframe structure.

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
Models
A185E, A185F, 185A, 185B, 185C, 185E, 185
Type certificates
3A24, 3A24, 3A24, 3A24, 3A24, 3A24, 3A24
On this site
Cessna 185 Skywagon 227 registered
Cessna A185 Skywagon 1,372 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 21, 2026.