ST04370NY

Installation of Gogo 2KU - Structural and Electrical Provisions in accordance with STC Twenty One Limited Master Document List S21.MDL-1330, Issue 3 dated October 14, 2016 or later EASA approved revisions. Aircraft is to be maintained in accordance with STC Twenty One Limited Instructions for Continued Airworthiness, Doc. No. S21.TEC-0522, Issue 1, Appendix A, Section 3-Airworthiness Limitations dated October 14, 2016 or later EASA accepted revisions. STC Twenty One Limited Aircraft Flight Manual Supplement, Doc. No. S21.FMS-0134, Issue 1 dated October 14, 2016 or later EASA approved revisions. Held by Delta Engineering Corporation, which holds 273 approved modifications in all. Last revised March 2, 2021. System: electrical power.

What it applies to

Kind of product: Aircraft
Design holder: The Boeing Company
Models: 747-400 Series
Type certificate: A20WE
On this site: Boeing 747 192 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 21, 2026.