STC SH559NW
FAA DRS lists SH559NW as Current · Reissued, held by Siam Hiller Holdings Inc, for Hiller Aviation UH-12D (Army UH-23D). Recorded change: Installation and maintenance of engine inlet air cleaner system. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Snapshot dated June 30, 2026.
FAA-listed holder
Aircraft configurations
1
FAA revision date
FAA status
Current · Reissued
Recorded modification
What the FAA record covers
SH559NW identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.
Applicability
Aircraft named in FAA DRS
Named aircraft: Hiller Aviation UH-12D (Army UH-23D). Confirm the approved model list, serial effectivity, configuration, and certificate revision.
Related engine and powerplant STCs
Installation of the Engine Inlet Barrier Filter System (IBFS).
FAA holder: Coulson Aircrane Ltd.
Installation of Aero Sound Shield Acoustical Firewall Blanket, Part No. AS-0500.
FAA holder: Luminary Air Group LLC
FAA record reference
- STC number
- SH559NW
- Product
- Aircraft · Rotorcraft
- Country
- United States
- Application date
- July 11, 1977
- Revision date
- August 19, 2005
- CFR references
- Part 21, Part 27