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Engine and powerplant

STC SH178WE

FAA DRS lists SH178WE as Current · Reissued, held by Siam Hiller Holdings Inc, for Hiller Aircraft UH-12E and Hiller Aircraft UH-12E-L. Recorded change: Installation of Allison 250-C20/250-C20B engine and related changes. (UH-12E-L (4 place)). Snapshot dated June 30, 2026.

FAA-listed holder
Siam Hiller Holdings Inc
Aircraft configurations
2
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Installation of Allison 250-C20/250-C20B engine and related changes. (UH-12E-L (4 place)).

SH178WE 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 Aircraft UH-12E and Hiller Aircraft UH-12E-L. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Hiller Aircraft UH-12E4H11
Hiller Aircraft UH-12E-L4H11

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Hiller Aircraft UH-12E and Hiller Aircraft UH-12E-L 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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