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

SH592GL

Install Tayburn Electronics microwave antennae, microwave transmitter, and microwave receiver to landing gear skid. Held by Airborne Microwave, INC, which holds 2 approved modifications in all. Last revised February 12, 1982. System: landing gear.

What it applies to

Kind of product
Aircraft
Design holder
The Enstrom Helicopter Corporation; The Enstrom Helicopter Corporation; The Enstrom Helicopter Corporation; The Enstrom Helicopter Corporation; The Enstrom Helicopter Corporation; The Enstrom Helicopter Corporation
Models
280C, 280F, 280, F-28A, F-28C, F-28F
Type certificates
H1CE, H1CE, H1CE, H1CE, H1CE, H1CE
On this site
Enstrom Helicopter Corp 280 61 registered
Enstrom F-28 147 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.