HILLER UH-12E-L

01 /  Distribution

Where the fleet lives and was built

Counts of currently-registered HILLER UH-12E-L aircraft by US state and decade of manufacture, sourced from the FAA Aircraft Registry.

02 /  NTSB Records

Events involving HILLER UH-12E-L aircraft

No NTSB-recorded events match HILLER UH-12E-L in the indexed corpus.

03 /  Airworthiness Directives

FAA directives applicable to HILLER UH-12E-L

5 directive(s) on file. Showing the most recent 5.

• Aug 20, 2025

  Airworthiness Directives; Siam Hiller Holdings, Inc.

  The FAA is adopting a new airworthiness directive (AD) for certain Siam Hiller Holdings, Inc. (Siam Hiller), Model UH-12E (Army OH-23G and H-23F) and UH-12E-L helicopters. This AD was prompted by reports of cracks found in a main rotor (M/R) transmission drive shaft (drive shaft). This AD requires inspecting certain M…

  Atlas AD → Federal Register ↗

• Jan 14, 2025

  Airworthiness Directives; Siam Hiller Holdings, Inc, Helicopters

  The FAA proposes to adopt a new airworthiness directive (AD) for Siam Hiller Holdings, Inc. (Siam Hiller), Model UH-12E (Army OH-23G and H-23F) and UH-12E-L helicopters. This proposed AD was prompted by reports of cracks found in a main rotor (M/R) transmission drive shaft (drive shaft). This proposed AD would require…

  Atlas AD → Federal Register ↗

• May 18, 2005

  Airworthiness Directives; Rolls-Royce Corporation (Formerly Allison Engine Company) 250-B17B, -B17C, -B17D, -B17E, -C20, -C20B, -C20F, -C20J, -C20S, and -C20W Turboprop and Turboshaft Engines

  The FAA is adopting a new airworthiness directive (AD) for Rolls- Royce Corporation (RRC) (formerly Allison Engine Company) 250-B17B, - B17C, -B17D, -B17E, -C20, -C20B, -C20F, -C20J, -C20S, and -C20W turboprop and turboshaft engines that do not have turbine energy absorbing ring, RRC part number (P/N) 23035175, or an…

  Atlas AD → Federal Register ↗

• Dec 6, 2000

  Airworthiness Directives; Siam Hiller Holdings, Inc. Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4 Helicopters

  This amendment adopts a new airworthiness directive (AD), for Siam Hiller Holdings, Inc. (Hiller), formerly Rogerson Hiller Corporation, Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH- 12E-L, UH-12L, and UH-12L4 helicopters, that requires replacing all undrilled-shank bolts at pivoting joints in the control s…

  Atlas AD → Federal Register ↗

• Aug 31, 2000

  Airworthiness Directives; Siam Hiller Holdings, Inc. Model UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4 Helicopters

  This document proposes the adoption of a new airworthiness directive (AD) for Siam Hiller Holdings, Inc. (Hiller), formerly Rogerson Hiller Corporation, Model UH-12, UH-12A, UH-12B, UH-12C, UH- 12D, UH-12E, UH-12E-l, UH-12L, and UH-12L4 helicopters. The AD would require replacing all undrilled-shank bolts at pivoting…

  Atlas AD → Federal Register ↗

04 /  Type Certificate Data Sheets

FAA TCDS for HILLER UH-12E-L

The TCDS is the legal certification document — weight limits, performance, equipment, AD compliance times, operating limitations. 1 match in the FAA catalog.

• 4H11 Current Rev 15 · 10/15/1989

  Rogerson Hiller Corporation

  Models: UH-12E, UH-12E-L

  Atlas TCDS → DRS ↗

06 /  Supplemental Type Certificates

Modifications approved for HILLER UH-12E-L

72 STCs on file — every FAA-approved modification, alteration, or installation for this aircraft. STOL kits, avionics, fuel systems, floats, engine swaps, you name it.

• 04/14/2023

  STC SH3319NM

  Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,

  Precise Flight Inc

  Atlas STC → DRS ↗

• 05/19/2020

  STC SH3319NM (1 OF 2)

  Installation of Precise Flight Pulselite Control Unit in the\nLanding /Taxi Recognition Visual Control Light system,

  Precise Flight Inc

  Atlas STC → DRS ↗

• 12/29/2016

  STC SH3319NM

  Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,

  Precise Flight Inc

  Atlas STC → DRS ↗

• 01/14/2015

  STC SR02394AK

  Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system

  Seaplanes North LLC

  Atlas STC → DRS ↗

• 06/09/2014

  STC SH3319NM

  Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,

  Precise Flight Inc

  Atlas STC → DRS ↗

• 07/25/2013

  STC SH3319NM

  Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,

  Precise Flight Inc

  Atlas STC → DRS ↗

• 10/17/2012

  STC SH3319NM

  Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,

  Precise Flight Inc

  Atlas STC → DRS ↗

• 05/23/2012

  STC SR02394AK

  Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system

  Floats Alaska LLC

  Atlas STC → DRS ↗

• 03/15/2012

  STC SR02394AK

  Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system per Installation Instructions LED03-20R, Rev. IR, dated October 27, 2010.

  Floats Alaska LLC

  Atlas STC → DRS ↗

• 02/21/2012

  STC SH3319NM

  Installation of Precise Pulselite Control System

  Precise Flight Inc

  Atlas STC → DRS ↗

• 10/20/2010

  STC SA00068SE (PAGE 1)

  Installation of fuel flow/pressure instruments. (W/TSIO-360-MB1)

  Electronics International Inc.

  Atlas STC → DRS ↗

• 12/10/2009

  STC SA2693NM (PAGE 1)

  Installation of Electronics International digital volt/amp gauges and accessories.

  Electronics International Inc.

  Atlas STC → DRS ↗

• 04/15/2009

  STC SH381NW

  Installation and maintenance of engine auto reignition system. (UH-12E modified per STC SH178WE)

  Siam Hiller Holdings Inc

  Atlas STC → DRS ↗

• 02/10/2009

  STC SA593CH (Page 1)

  Install Champion SlickSTART magneto booster system.

  Champion Aerospace LLC

  Atlas STC → DRS ↗

• 07/24/2008

  STC SA02033AT (PAGE 5)

  Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line (47J series w stc's SH4-235SW, SH4-826SW or SH479SW)

  M-20 Oil Separators LLC

  Atlas STC → DRS ↗

• 04/10/2006

  STC SA02033AT (PAGE 1)

  Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line (47J series w stc's SH4-235SW, SH4-826SW or SH479SW)

  M-20 Oil Separators LLC

  Atlas STC → DRS ↗

• 04/02/2006

  STC SA01240SE (1 OF 5)

  Installation of secondary voltage indication system

  Visual Instruments LLC

  Atlas STC → DRS ↗

• 03/29/2006

  STC SA02268CH (PAGE 3)

  Installation of Airwolf Filter Corp. Air Oil Separator

  Airwolf Filter Corporation

  Atlas STC → DRS ↗

• 08/19/2005

  STC SH178WE

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

  Siam Hiller Holdings Inc

  Atlas STC → DRS ↗

• 06/29/2005

  STC SA02033AT (PAGE 1)

  Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line (47J series w stc's SH4-235SW, SH4-826SW or SH479SW)

  M-20 Oil Separators LLC

  Atlas STC → DRS ↗

• 05/17/2005

  STC SA02033AT (PAGE 1)

  Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line (47J series w stc's SH4-235SW, SH4-826SW or SH479SW)

  M-20 Oil Separators LLC

  Atlas STC → DRS ↗

• 04/15/2005

  STC SH381NW

  Installation and maintenance of engine auto reignition system. (UH-12E modified per STC SH178WE)

  Hiller Aircraft Corporation

  Atlas STC → DRS ↗

• 01/24/2005

  STC SA2693NM

  Installation of Electronics International digital volt/amp gauges and accessories.

  Electronics International Inc.

  Atlas STC → DRS ↗

• 11/04/2004

  STC SA02033AT (PAGE 3)

  Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line (47J series w stc's SH4-235SW, SH4-826SW or SH479SW)

  M-20 Oil Separators LLC

  Atlas STC → DRS ↗

• 03/12/2004

  STC SA593CH (2 OF 5)

  Install Champion SlickSTART magneto booster system.

  Champion Aerospace LLC

  Atlas STC → DRS ↗

• 11/07/2003

  STC SH3319NM

  Installation of Precise Pulselite Control Unit in the Landing/Taxi/Recognition Visual Control Light System.

  Precise Flight Inc

  Atlas STC → DRS ↗

• 09/05/2003

  STC SA01258SE

  Installation of the Automatic Flagman Dispenser Models in accordance with Automatic Flagman Master Drawing Lists specified in attached AML, or later FAA approved revision.This STC …

  R-S Sales Inc.

  Atlas STC → DRS ↗

• 05/30/2002

  STC SA02520AT

  Installation of M-20 Oil Separator, model 600-WP.

  M-20 Oil Separators LLC

  Atlas STC → DRS ↗

• 12/03/2001

  STC SH3319NM

  Installation of Precise Pulselite Control Unit in the Landing/Taxi/Recognition Visual Control Light System.

  Precise Flight Inc

  Atlas STC → DRS ↗

• 08/27/2001

  STC SH849NW

  Installation of North American Industries, Inc., Model No. 5 Automatic Flagman in accordance with North American Industries, Inc., Installation Instructions No. 12-1000. NOTE: The …

  R-S Sales Inc.

  Atlas STC → DRS ↗

+ 42 more STCs on file

07 /  PMA replacement parts

FAA-approved replacement parts for HILLER UH-12E-L

60+ parts on file from the FAA Parts Manufacturer Approval database. Each is a non-OEM part the FAA has authorized for use as a replacement on this aircraft type.

• J-10114-19#https://drs.faa.gov/browse/excelExternalWindow/A20DB87055EDB9368625786500732535.0001##

  Torsion Coupling Bonded Assembly

  Lord Corporation replaces 21075

  PMA holder →

• J-10114-19#https://drs.faa.gov/browse/excelExternalWindow/0E3D1942716BF9088625786500732564.0001##

  Torsion Coupling Bonded Assembly

  Lord Corporation replaces 21075

  PMA holder →

• AA-63197-5#https://drs.faa.gov/browse/excelExternalWindow/AAD4F2669292453A862581A100668172.0001##

  Bracket, Engine Snubber

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 63197-5

  PMA holder →

• AA-63192-11#https://drs.faa.gov/browse/excelExternalWindow/4CC34532A29F1FED862581A1006680E0.0001##

  Snubber Assy, Engine

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 63192-11

  PMA holder →

• AA-63192-9#https://drs.faa.gov/browse/excelExternalWindow/7E6B5B41B61A0594862581A10066809A.0001##

  Snubber Assy, Engine

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 63192-9

  PMA holder →

• AA-25219-5#https://drs.faa.gov/browse/excelExternalWindow/968BA17DE51C97178625809E0061954E.0001##

  Plate, Retaining, Shaft, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25219-5

  PMA holder →

• AA-25234-11#https://drs.faa.gov/browse/excelExternalWindow/3C59F18501B331AC8625809E006192EC.0001##

  Housing Assy, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25234-11

  PMA holder →

• AA-25219-5#https://drs.faa.gov/browse/excelExternalWindow/6116D83823B113C28625809E00618C7B.0001##

  Plate, Retaining, Shaft, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25219-5

  PMA holder →

• AA-25213-3#https://drs.faa.gov/browse/excelExternalWindow/E3F70ED4C1A3BD378625809E00618A2D.0001##

  Housing, Carrier Bearing, Outer Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25213-3

  PMA holder →

• AA-25209-3#https://drs.faa.gov/browse/excelExternalWindow/1355F75E54A8CD778625809E006186BF.0001##

  Housing, Carrier Bearing, Inner, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25209-3

  PMA holder →

• AA-25208-3#https://drs.faa.gov/browse/excelExternalWindow/49DD190411C871738625809E006185CA.0001##

  Shim, Bearing Housing, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25208-3

  PMA holder →

• AA-34038#https://drs.faa.gov/browse/excelExternalWindow/B8357BA1C7013EAB8625809E00618087.0001##

  Sleeve Assy, Wobble Plate, Cyclic Controls

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 34038

  PMA holder →

• AA-63192-7#https://drs.faa.gov/browse/excelExternalWindow/65ABAD8DE65A4241862581A100668052.0001##

  Snubber Assy, Engine

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 63192-7

  PMA holder →

• AA-63192-5#https://drs.faa.gov/browse/excelExternalWindow/3B1F36E3DB3D7F8B862581A10066800C.0001##

  Snubber Assy, Engine

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 63192-5

  PMA holder →

• AA-74184-5#https://drs.faa.gov/browse/excelExternalWindow/9065F0BA1F35A7018625809E006176F0.0001##

  Fitting, Coupling Shaft, Flexible, Cooling Fan Drive, Eng.

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 74184-5

  PMA holder →

• AA-43001-5#https://drs.faa.gov/browse/excelExternalWindow/2A929350FAEDD0388625809E00617380.0001##

  Runner, Skid Landing Gear

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 43001-5

  PMA holder →

• AA-31319-3#https://drs.faa.gov/browse/excelExternalWindow/7566504FEA59D2C3862581A100667F7E.0001##

  Tube, Collective Control

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 31319-3

  PMA holder →

• 10-357487-241#https://drs.faa.gov/browse/excelExternalWindow/97597E2D77D67D7F8625810200794D5C.0001##

  Starting Vibrator, S200 Series, 24 Volts DC -

  Continental Motors Inc replaces 10-357487-241

  PMA holder →

• 10-357290-1#https://drs.faa.gov/browse/excelExternalWindow/851711484DBB32448625810200794BF2.0001##

  Switch, Ignition

  Continental Motors Inc replaces 10-357290-1

  PMA holder →

• AA-25236#https://drs.faa.gov/browse/excelExternalWindow/E90D9CD2CB2B4B928625809E006193DA.0001##

  Guide, Motion Converter, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25236

  PMA holder →

• AA-25235#https://drs.faa.gov/browse/excelExternalWindow/FB959C69EA3A5ED78625809E00619361.0001##

  Motion Converter, Pitch Change, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25235

  PMA holder →

• AA-25220-3#https://drs.faa.gov/browse/excelExternalWindow/52545C1FAA49E18D8625809E00618D65.0001##

  Plate, Retaining, Shaft, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25220-3

  PMA holder →

• AA-25211-3#https://drs.faa.gov/browse/excelExternalWindow/8B9DB1D650ED41A48625809E006187AF.0001##

  Gearshaft, Bevel, Input, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25211-3

  PMA holder →

• AA-74177-3#https://drs.faa.gov/browse/excelExternalWindow/CAD69C8D2AE7271B8625809E00617603.0001##

  Fan Assy, Engine, Cooling

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 74177-3

  PMA holder →

• AA-25210-3#https://drs.faa.gov/browse/excelExternalWindow/01EF592132A0A06D8625809E00616D55.0001##

  Gear, Bevel, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25210-3

  PMA holder →

• AA-74177-5#https://drs.faa.gov/browse/excelExternalWindow/5946AAA3231648B28625809E00617676.0001##

  Fan Assy, Engine, Cooling

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 74177-5

  PMA holder →

• AA-25211-3#https://drs.faa.gov/browse/excelExternalWindow/35CB43C3278B68868625809E00616EC4.0001##

  Gear Shaft, Bevel, Input, Speed Decreaser

  Airwolf Aerospace LLC (formerly Airwolf Helicopter) replaces 25211-3

  PMA holder →

• 34412-401-MDL#https://drs.faa.gov/browse/excelExternalWindow/262B2A10AED88B2886257DF70054FAE2.0001##

  Bell 47 / UH-12 Hydraulic Pump Retrofit

  Kawak Aviation Technologies Inc replaces Modification Part

  PMA holder →

• 83407#https://drs.faa.gov/browse/excelExternalWindow/A68FDDF13E084C2986257B4F004E2219.0001##

  Kit Installation, Battery Temperature Monitor

  Hiller Aircraft Corporation replaces 83407

  PMA holder →

• 10053#https://drs.faa.gov/browse/excelExternalWindow/5C3EC8BAE10B611886257B4F004E2241.0001##

  Kit Installation, Lubrication Modification

  Hiller Aircraft Corporation replaces 10053

  PMA holder →

• 33046#https://drs.faa.gov/browse/excelExternalWindow/A6EBCC1D0BC7063C86257B4F004E2230.0001##

  Grip Installation, Cyclic Control Stick

  Hiller Aircraft Corporation replaces 33046

  PMA holder →

• 81261#https://drs.faa.gov/browse/excelExternalWindow/1FA8C73009B11B3A86257B4F004E2222.0001##

  Equipment Assembly - Switch and Circuit Breaker Panel

  Hiller Aircraft Corporation replaces 81261

  PMA holder →

• 81309#https://drs.faa.gov/browse/excelExternalWindow/F4EC94AE75418C4486257B4F004E2221.0001##

  Pressure Gage Installation, Transmission Oil

  Hiller Aircraft Corporation replaces 81309

  PMA holder →

• 96225#https://drs.faa.gov/browse/excelExternalWindow/D96EF6DFF9FF463386257B4F004E223A.0001##

  Litter Installation, landing Gear

  Hiller Aircraft Corporation replaces 96225

  PMA holder →

• 61476#https://drs.faa.gov/browse/excelExternalWindow/7B6B621F2CA3E72986257B4F004E222C.0001##

  Installation, Kit Keel Reinforcement, Basic Body

  Hiller Aircraft Corporation replaces 61476

  PMA holder →

• 86016#https://drs.faa.gov/browse/excelExternalWindow/261A4EE7C08F334286257B4F004E221F.0001##

  Support Installation, Kit ELT

  Hiller Aircraft Corporation replaces 86016

  PMA holder →

• 96222#https://drs.faa.gov/browse/excelExternalWindow/EDFA8669354C380A86257B4F004E2238.0001##

  Installation First Aid and Fire Extinguisher

  Hiller Aircraft Corporation replaces 96222

  PMA holder →

• 86006#https://drs.faa.gov/browse/excelExternalWindow/86CF51EC75E881C986257B4F004E221A.0001##

  Stowage Installation, First Aid Kit, UH-12E and 4-Place Conversion

  Hiller Aircraft Corporation replaces 86006

  PMA holder →

• 64340#https://drs.faa.gov/browse/excelExternalWindow/358C71913F7D5F0B86257B4F004E2225.0001##

  Weight, Ballast Installation

  Hiller Aircraft Corporation replaces 64340

  PMA holder →

• 42202#https://drs.faa.gov/browse/excelExternalWindow/73589699B86DF52986257B4F004E2229.0001##

  Strut - Tail Skid

  Hiller Aircraft Corporation replaces 42202

  PMA holder →

+ 20 more PMA parts on file

04 /  Regulations watching this type

Advisory Circulars and Federal Register activity for HILLER UH-12E-L

05 /  Aircraft of this type

All 1 registered N-numbers

Every tail currently on the FAA registry for this make/model. Click an N-number to query the FAA Aircraft Inquiry; rows flagged ● have NTSB events on file. Tails seeded with full TallyAero pages link directly.

05 /  Sources & Methodology

Every count traces back to a primary US-government source

• FAA Aircraft Registry →

  Refreshed Apr 27, 2026

  Available

• NTSB CAROL →

  Refreshed Apr 27, 2026

  Available

• Federal Register (FAA Airworthiness Directives) →

  Refreshed Apr 27, 2026

  Available

We render counts and lists as the agency publishes them. Read the methodology →