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.
Buyer checks
Confirm before sourcing
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