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Engine and powerplant

STC SH657NW

FAA DRS lists SH657NW as Current · Reissued, held by Siam Hiller Holdings Inc, for Bell Helicopter Textron 47G-2A, Bell Helicopter Textron 47G-2A-1, and Bell Helicopter Textron 47G-3B, and 7 more aircraft configurations. Recorded change: Installation of Allison 250-C18A, -C18C, -C20, -C20B engine and related changes. Snapshot dated June 30, 2026.

FAA-listed holder
Siam Hiller Holdings Inc
Aircraft configurations
10
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Installation of Allison 250-C18A, -C18C, -C20, -C20B engine and related changes.

SH657NW 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: Bell Helicopter Textron 47G-2A, Bell Helicopter Textron 47G-2A-1, and Bell Helicopter Textron 47G-3B, and 7 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Bell Helicopter Textron 47G-2A2H3Bell Helicopter Textron 47G-2A-12H3Bell Helicopter Textron 47G-3B2H3Bell Helicopter Textron 47G-3B-12H3Bell Helicopter Textron 47G-3B-22H3Bell Helicopter Textron 47G-3B-2A2H3Bell Helicopter Textron 47G-42H3Bell Helicopter Textron 47G-4A2H3Bell Helicopter Textron 47G-52H3Bell Helicopter Textron 47G-5A2H3

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Bell Helicopter Textron 47G-2A and Bell Helicopter Textron 47G-2A-1, and 8 more aircraft configurations 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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