Approved modifications · supplemental type certificate · current · reissued

SA4-918

1. Aircraft wiring in accordance with Douglas Aircraft Co. Service Change #17 (UAL COA-0-1456) to provide an operational Aircraft Flight Data Rrecorder conforming to CAR Amendment 40-6, paragraph 40.208 with the following additions to assure recording of data during takeoff and landing roll: \na.\tRelay to provide automatic start of recording when nose landing gear reaches airborne condition on takeoff.\nb.\tTime delay relay to turn off recorder one minute after nose landing gear reaches "on ground" condition, on landing.\nc.\tInstallation of standard toggle switch on Systems Engineer's Console, to permit Second Officer to turn on recorder at start of takeoff run.\n2. Install Waste King Flight Data Recorder #5424, TSO-C51. Held by United Airlines INC, which holds 520 approved modifications in all. Last revised November 30, 2011. System: landing gear.

What it applies to

Kind of product: Aircraft
Design holder: The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company; The Boeing Company
Models: DC-8-11, DC-8-12, DC-8-21, DC-8-31, DC-8-32, DC-8-33, DC-8-41, DC-8-42, DC-8-43, DC-8-51, DC-8-52, DC-8-53, DC-8-55, DC-8-61, DC-8-61F, DC-8-62, DC-8-62F, DC-8-63, DC-8-63F, DC-8-71, DC-8-71F, DC-8-72, DC-8-72F, DC-8-73, DC-8-73F, DC-8F-54, DC-8F-55
Type certificates: 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25, 4A25
On this site: Douglas DC-8 6 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 20, 2026.