Aircraft STC directory

Boeing Defense & Space Group 234 STCs

The Jun 30, 2026 FAA DRS snapshot contains 9 selected supplemental type certificates with status Current whose public applicability data names the Boeing Defense & Space Group 234. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

listed Current at snapshot

holder directories

modification categories

Jan 4, 2007

latest recorded revision

Modification demand surface

Other aircraft modifications4 Rotorcraft modifications3 Engine and powerplant1 Aircraft connectivity1

Recorded holders

Columbia Helicopters Inc6 Technisonic Industries Limited1 Enviro Systems Inc.1

Recently revised 234 STCs

Showing the 9 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.

SH2928NMEngine and powerplantRevised Jan 4, 2007

Installation of an improved engine electrical wiring harness on Boeing Vertol 234 with Lycoming AL5512 engines.

FAA holder: Columbia Helicopters Inc

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SR01674SERotorcraft modificationsRevised May 9, 2006

Fabrication of Columbia Helicopters, Inc. (CHI) Support Assembly, part number C34D6001-9.

FAA holder: Columbia Helicopters Inc

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SR01392SERotorcraft modificationsRevised Mar 17, 2004

Fabrication and Installation of "Provisional Hardpoints" per Columbia Helicopter Master Drawing List, Document No. 04-RDE-0208, revision B, dated March 17, 2004, or later FAA approved revision and maintained in accordance with Instructions for Continued Airworthiness WAI0204-04, Revision 0, dated May 6, 2003, or later FAA approved revision.

FAA holder: Columbia Helicopters Inc

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SR00811NYOther aircraft modificationsRevised Feb 25, 2004

Installation of Technisonic Industries Limited TFM-138 series transceiver models.

FAA holder: Technisonic Industries Limited

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SR01834NYAircraft connectivityRevised Nov 26, 2003

Installation of Globalstar Satellite Telephone System.

FAA holder: Atlantic Avionics Inc.

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SH2720SOOther aircraft modificationsRevised Jun 20, 2003

Installation of Aero Aire Model 234 Environmental Control System (ECS) in accordance with Aero Aire Master Drawing List Document No. A234R002, Revision B, dated March 7, 1990, or later FAA Approved Revision.

FAA holder: Enviro Systems Inc.

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SR00955SEOther aircraft modificationsRevised Aug 17, 2001

Replacement of the pilot and co-pilot cockpit doors with bubble doors in accordance with McClenahan Engineering Master Drawing List No. DM0116-3, dated June 2, 2001, or later FAA approved revision. (S/N's MJ017 and MJ022).

FAA holder: Columbia Helicopters Inc

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SR00956SEOther aircraft modificationsRevised Aug 17, 2001

Installation of offset cyclic and collective control sticks in accordance with McClenahan Engineering Master Drawing List No. DM0118-3, Revision A, dated July 13, 2001, or later FAA approved revision. For serial numbers MJ017 and MJ022 only.

FAA holder: Columbia Helicopters Inc

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SR00875SERotorcraft modificationsRevised Feb 16, 2001

Installation of Honeywell Solid State Flight Data Recorder (SSFDR) and Teledyne Digital Flight Data Acquisition Unit (DFDAU) per Columbia Helicopters, Inc., Master Drawing List 99-AVI-0221, Revision B, dated February 14, 2001, or later FAA approved revision.

FAA holder: Columbia Helicopters Inc

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