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

SA3171WE

The auxiliary power unit Model GTC 85-71 located in the forward end of the left hand main landing gear wheel well fairing has been replaced by an AiResearch Gas turbine compressor Model GTCP85-98CK(A). Held by Kellstrom Defense Aerospace INC., which holds 3 approved modifications in all. Last revised June 5, 2003. System: engine.

What it applies to

Kind of product
Aircraft
Design holder
Lockheed Aircraft Corporation; Lockheed Aircraft Corporation; Lockheed Aircraft Corporation
Models
382E, 382G, 382F
Type certificates
A1SO, A1SO, A1SO
On this site
Lockheed Martin Corp 382 5 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.