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

SA4221WE

Installation of two Albany International dispersion POD, Drawing No. 21940 or 21961. Held by Ecogen, INC, which holds 4 approved modifications in all. Last revised April 28, 1993. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
The New Piper Aircraft Inc.
Models
PA-36-285 (Restricted Cat.)
Type certificate
A10SO
On this site
Piper PA-36 Pawnee Brave 99 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 22, 2026.