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

SR00823AT

This modification will allow the installation or rear extended cabin step. Held by Thoroughbred Aviation Maintenance INC, which holds 8 approved modifications in all. Last revised February 25, 2022. System: cabin, seats and restraints.

What it applies to

Kind of product
Aircraft
Design holder
MD Helicopter Inc.
Models
369 (Army YOH-6A)
Type certificate
H3WE
On this site
Md Helicopters Llc 369 34 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 7, 2026.