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

SA5517NM

Limited to installation on serial numbers 27314 and 42994 ONLY. Installation of a Class "E" cargo compartment, removal of carburetor fluid anti-icing systems, and removal of cabin combustion heater. Held by Hawaii Pacific Air. Last revised December 24, 1991. System: engine.

What it applies to

Kind of product
Aircraft
Design holder
McDonnell Douglas Corporation
Models
DC-4
Type certificate
A-762
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.