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

SA1388CE

In accordance with PMC Drawing 70J2482, or later FAA approved revision, the magnesium or aluminum forward thrust reverser blocker doors are replaced with nylon doors manufacture per PMC Drawing 70J2481, Revision E, or later FAA approved revisions. Held by P & R Trading INC.. Last revised February 7, 1996. System: airframe structure.

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
Models
707-100 Long Body, 707-100B Long Body, 707-100B Short Body, 707-200, 707-300 Series, 707-300B Series, 707-300C Series, 707-400 Series, 720 Series, 720B Series
Type certificates
4A21, 4A21, 4A21, 4A21, 4A26, 4A26, 4A26, 4A26, 4A28, 4A28
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 12, 2026.