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

ST00792LA

Installation of Retardant Tanks for the special purpose of Forest and Wildlife Conservation. Held by United Aeronautical Corporation, which holds 17 approved modifications in all. Last revised April 15, 2015. System: other and general.

What it applies to

Kind of product
Aircraft
Design holder
Aero Union Corporation; Aero Union Corporation
Models
P3A, P3B
Type certificates
T00006LA, T00006LA
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.