SH247NWEngine and powerplant
Installation and maintenance of exhaust ejector engine oil cooler system. (UH-12D (ARMY UH-23D modified per STC SH177WE).
FAA holder: Siam Hiller Holdings Inc
Aircraft STC directory
Hiller Aviation UH-12D (Army UH-23D) STCs
The Jun 30, 2026 FAA DRS snapshot contains 12 selected supplemental type certificates with status Current whose public applicability data names the Hiller Aviation UH-12D (Army UH-23D). Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
12
listed Current at snapshot
1
holder directories
5
modification categories
Aug 19, 2005
latest recorded revision
Modification demand surface
Engine and powerplant6
Cargo and special mission3
Fuel systems1
Cabin and interiors1
Landing gear and brakes1
Recorded holders
Recently revised UH-12D (Army UH-23D) STCs
Showing the 12 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SH295NWFuel systems
Installation of Hiller auxiliary fuel tanks kit No 72041. (UH-12D (ARMY UH-23D) modified per STC SH177WE).
FAA holder: Siam Hiller Holdings Inc
SH297NWCabin and interiors
Installation and maintenance of a cabin heater system. (UH-12D (ARMY UH-23D modified per STC SH178WE).
FAA holder: Siam Hiller Holdings Inc
SH299NWCargo and special mission
Installation of Soloy cargo racks.
FAA holder: Siam Hiller Holdings Inc
SH321NWEngine and powerplant
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).
FAA holder: Siam Hiller Holdings Inc
SH338NWEngine and powerplant
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).
FAA holder: Siam Hiller Holdings Inc
SH380NWEngine and powerplant
Installation and maintenance of engine auto reignition system. (UH-12D (ARMY UH-23D) modified per STC SH177WE).
FAA holder: Siam Hiller Holdings Inc
SH505NWCargo and special mission
Installation of cargo release pedal.
FAA holder: Siam Hiller Holdings Inc
SH559NWEngine and powerplant
Installation and maintenance of engine inlet air cleaner system. (UH-12D (ARMY UH-23D) modified per STC SH177WE).
FAA holder: Siam Hiller Holdings Inc
SH177WEEngine and powerplant
Installation of Allison 250-C20/250-C20B engine and related changes.
FAA holder: Siam Hiller Holdings Inc
SH287NWLanding gear and brakes
Installation of Hiller landing gear float kit No. 44012. (UH-12d (ARMY UH-23D modified per STC SH177WE).
FAA holder: Siam Hiller Holdings Inc
SH475NWCargo and special mission
Installation of an agricultural spray system. (UH-12D (ARMY UH-23D) modifier per STC).
FAA holder: Siam Hiller Holdings Inc