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

SA153GL

Installation of X band weather radome only on models with Convair 22-71001-1 support assembly (bulk-head assembly). (30A 990). Held by Norton Company, Performance Plactics, which holds 62 approved modifications in all. Last revised February 16, 1977. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
General Dynamics Corporation; General Dynamics Corporation
Models
30, 30A
Type certificates
4A30, 4A30
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.