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Engine and powerplant

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
Siam Hiller Holdings Inc
Aircraft configurations
1
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Installation and maintenance of engine inlet air cleaner system. (UH-12D (ARMY UH-23D) modified per STC SH177WE).

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.

Hiller Aviation UH-12D (Army UH-23D)4H10

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Hiller Aviation UH-12D (Army UH-23D) model, serial range, and configuration?
  2. 02Which powerplant configuration, limits, instruments, and maintenance data apply?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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