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

SA53EA

Removal of left rear cabin door and installation of parachuting step, static line anchor cable, pilot and jumpmaster signal system panels for the purpose of parachute jumping. Held by Parachutes INC. Last revised January 1, 1960. System: emergency equipment.

What it applies to

Kind of product
Aircraft
Design holder
Noorduyn Aviation Ltd.
Models
Army UC-64
Type certificate
A-2-578
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.