FAA-listed STC holder

Siam Hiller Holdings Inc STCs

The Jun 30, 2026 FAA DRS snapshot lists 27 selected supplemental type certificates with status Current under Siam Hiller Holdings Inc. The records span 12 public aircraft directories and 6 modification categories. This is a research directory, not a claim that any specific kit or service is currently offered.

listed Current at snapshot

aircraft directories

modification categories

May 15, 2009

latest recorded revision

Modification mix

Engine and powerplant13 Cargo and special mission6 Fuel systems3 Landing gear and brakes2 Cabin and interiors2 Other aircraft modifications1

Aircraft represented

Rogerson Hiller UH-12E13 STCs Hiller Aviation UH-12D (Army UH-23D)12 STCs Bell Helicopter Textron 47G-2A7 STCs Bell Helicopter Textron 47G-2A-17 STCs Bell Helicopter Textron 47G-3B7 STCs Bell Helicopter Textron 47G-3B-16 STCs Bell Helicopter Textron 47G-46 STCs Bell Helicopter Textron 47G-4A6 STCs Bell Helicopter Textron 47G-3B-25 STCs Bell Helicopter Textron 47G-55 STCs Bell Helicopter Textron 47G-5A5 STCs Bell Helicopter Textron 47G-3B-2A4 STCs

Recently revised records

Showing the 27 most recently revised records. Category directories provide the complete paginated discovery path.

27 displayed records.

Search every indexed record for this holder. The table below contains the recently revised records shown on this page.

Siam Hiller Holdings Inc supplemental type certificates, aircraft applicability, source status and dates
STC and modification	Aircraft / model / TC	Source status and dates	Holder and authority
SH657NW Installation of Allison 250-C18A, -C18C, -C20, -C20B engine and related changes. Engine and powerplant View record	Bell Helicopter Textron 47G-2ATC 2H3 Bell Helicopter Textron 47G-2A-1TC 2H3 Bell Helicopter Textron 47G-3BTC 2H3 Bell Helicopter Textron 47G-3B-1TC 2H3 Bell Helicopter Textron 47G-3B-2TC 2H3 Bell Helicopter Textron 47G-3B-2ATC 2H3 Bell Helicopter Textron 47G-4TC 2H3 Bell Helicopter Textron 47G-4ATC 2H3 Bell Helicopter Textron 47G-5TC 2H3 Bell Helicopter Textron 47G-5ATC 2H3	Current at cited snapshot Revised May 15, 2009 Application: Nov 11, 1974	FAA holder: Siam Hiller Holdings Inc FAA authority record
SE769NW Installation of Soloy Part No. 250-1001-1 fuel line. Fuel systems View record	Allison Engine 250-C20TC E4CE Allison Engine 250-C18TC E4CE Allison Engine 250-C20BTC E4CE	Current at cited snapshot Revised Apr 15, 2009 Application: Mar 14, 1979	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH381NW Installation and maintenance of engine auto reignition system. (UH-12E modified per STC SH178WE). Engine and powerplant View record	Hiller Aircraft UH-12ETC 4H11	Current at cited snapshot Revised Apr 15, 2009 Application: Feb 24, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH476NW Installation of an agricultural spray system. Cargo and special mission View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Apr 15, 2009 Application: Aug 6, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH178WE Installation of Allison 250-C20/250-C20B engine and related changes. (UH-12E-L (4 place)). Engine and powerplant View record	Hiller Aircraft UH-12ETC 4H11 Hiller Aircraft UH-12E-LTC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Nov 27, 1967	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH247NW Installation and maintenance of exhaust ejector engine oil cooler system. (UH-12D (ARMY UH-23D modified per STC SH177WE). Engine and powerplant View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Oct 30, 1975	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH248NW Installation and maintenance of exhaust ejector engine oil cooler system. (UH-12E modified per STC SH178WE). Engine and powerplant View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Oct 30, 1975	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH288NW Installation of Hiller landing gear float kit No. 44012. (UH-12E modified per STC SH178WE). Landing gear and brakes View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Feb 24, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH295NW Installation of Hiller auxiliary fuel tanks kit No 72041. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Fuel systems View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Mar 15, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH296NW Installation of Hiller auxiliary fuel tanks kit No. 72041. (UH-12E modified per STC SH178WE). Fuel systems View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Mar 15, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH297NW Installation and maintenance of a cabin heater system. (UH-12D (ARMY UH-23D modified per STC SH178WE). Cabin and interiors View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Mar 11, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH298NW Installation and maintenance of a cabin heater system. (UH-12E modified per STC SH178WE). Cabin and interiors View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Mar 11, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH299NW Installation of Soloy cargo racks. Cargo and special mission View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Jan 8, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH300NW Installation of Soloy cargo racks. Cargo and special mission View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Jan 8, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH321NW Installation of a Bendix fuel control/power governor system on the Allison 250-C20 turbine powered Hiller UH-12D rotorcraft. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Engine and powerplant View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: May 17, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH322NW Installation of a Bendix fuel control/power governor system on the Allison 250-C20 turbine powered Hiller UH-12E rotorcraft. (UH-12E modified per STC SH178WE). Engine and powerplant View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: May 17, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH338NW Installation of transmission oil cooling system on the Allison250-C20 turbine powered Hiller UH-12D rotorcraft. (UH-12D (ARMY UH-23D modified per STC SH177WE). Engine and powerplant View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Jul 22, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH339NW Installation of transmission oil cooling system on the Allison250-C20 turbine powered Hiller UH-12E rotorcraft. (UH-12E modified per STC SH178WE). Engine and powerplant View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Jul 22, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH380NW Installation and maintenance of engine auto reignition system. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Engine and powerplant View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Feb 24, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH505NW Installation of cargo release pedal. Cargo and special mission View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Jul 14, 1977	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH506NW Installation of cargo release pedal. Cargo and special mission View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Jul 14, 1977	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH559NW Installation and maintenance of engine inlet air cleaner system. (UH-12D (ARMY UH-23D) modified per STC SH177WE). Engine and powerplant View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised Aug 19, 2005 Application: Jul 11, 1977	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH560NW Installation and maintenance of engine inlet air cleaner system. Engine and powerplant View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Jul 11, 1977	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH634NW Installation of Tundra Pads. Other aircraft modifications View record	Rogerson Hiller UH-12ETC 4H11	Current at cited snapshot Revised Aug 19, 2005 Application: Apr 6, 1978	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH177WE Installation of Allison 250-C20/250-C20B engine and related changes. Engine and powerplant View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised May 13, 2005 Application: Nov 27, 1967	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH287NW Installation of Hiller landing gear float kit No. 44012. (UH-12d (ARMY UH-23D modified per STC SH177WE). Landing gear and brakes View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised May 13, 2005 Application: Feb 24, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record
SH475NW Installation of an agricultural spray system. (UH-12D (ARMY UH-23D) modifier per STC). Cargo and special mission View record	Hiller Aviation UH-12D (Army UH-23D)TC 4H10	Current at cited snapshot Revised May 13, 2005 Application: Aug 6, 1976	FAA holder: Siam Hiller Holdings Inc FAA authority record