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

SA1130SW

Installation of side facing seats in accordance with (1) Custom Aircraft Conversions, Inc. Drawing List 7057, Revision B, dated 3/20/70, and E.O. No. 2, dated 11/6/71; or (2) Aviation Fabricators, Inc. STC Drawing List AF-206, Rev. (D), dated 5/5/98, or later FAA approved revision. Held by Aviation Fabricators INC, which holds 92 approved modifications in all. Last revised December 12, 2003. System: cabin, seats and restraints.

What it applies to

Kind of product
Aircraft
Design holder
The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
Models
PA-31, PA-31-300, PA-31-325, PA-31-350, PA-42, PA-42-1000, PA-42-720, PA-31P, PA-31P-350, PA-31T, PA-31T1, PA-31T2, PA-31T3
Type certificates
A20SO, A20SO, A20SO, A20SO, A23SO, A23SO, A23SO, A8EA, A8EA, A8EA, A8EA, A8EA, A8EA
On this site
Piper PA-31 Navajo and Chieftain 935 registered
Piper PA-42 59 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.