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

SA2528WE

Installation of Satco, Inc. cargo pallet assemblies P/N 31095-501, -503, -505, -507 when used in con- junction with net assemblies con- forming to NAS 3610-1A3N, 2A1N, 2A2N, 2A3N, 2A5N, and 2A6N. (707-351C). Held by Satco INC, which holds 21 approved modifications in all. Last revised May 18, 1972. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
The Boeing Company
Models
707
Type certificate
4A26
On this site
Boeing 707 9 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.