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

SA2-17

Installation of a 17-1/4 inch diameter camera mount ring. Approved for serial number 23-118 ONLY. Held by Sierra Industries INC, which holds 34 approved modifications in all. Last revised December 1, 1999. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
The New Piper Aircraft Inc.
Models
PA-23
Type certificate
1A10
On this site
Piper PA-23 Apache and Aztec 1,316 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.