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

SA367GL

Installation of Norton radome kit No. 2032X. Held by Norton Company, Performance Plactics, which holds 62 approved modifications in all. Last revised October 24, 1980. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
The New Piper Aircraft Inc.
Models
PA-31 Series
Type certificate
A20SO
On this site
Piper PA-31 Navajo and Chieftain 935 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.