The U.S. aircraft register, updated daily
Engines · piston (reciprocating) · data as of October 5, 2026

Lycoming VO-540 series

110 aircraft on the U.S. register carry a Lycoming VO-540 series engine, rated at about 310 horsepower. The Hiller UH-12 is the model most often fitted with it (56 aircraft). The aircraft carrying it were built between 1954 and 2000.

The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as Lycoming VO-540 series (2 codes). FAA spellings: VO-540 SERIES · VO-540 SER.

Fitted to model families

Hiller UH-1256Bell 4740Piper PA-32 Cherokee Six, Lance and Saratoga4Brantly 3052Piper PA-46 Malibu, Mirage, Matrix and M-Class2Texas Helicopter Corp OH-132Anthony L R/Anthony D J STARDUSTER II SA3001Bell 206 JetRanger and LongRanger1Cessna T206 Turbo Stationair1Hiller-Rogerson Helicopter UH12E1

Hiller UH-12 · Bell 47 · Piper PA-32 Cherokee Six, Lance and Saratoga · Brantly 305 · Piper PA-46 Malibu, Mirage, Matrix and M-Class · Texas Helicopter Corp OH-13 · Anthony L R/Anthony D J STARDUSTER II SA300 · Bell 206 JetRanger and LongRanger · Cessna T206 Turbo Stationair · Hiller-Rogerson Helicopter UH12E

Where they are owner's state

Texas20California12Washington6Idaho6Michigan5Kansas5Iowa5Wyoming4Minnesota4Colorado4

Kind of aircraft

Helicopters102 (93%)Piston singles8 (7%)

When the aircraft were built by decade

01225385061950501960181970919803199022000

What the FAA has certified, ordered and been told about the Lycoming VO-540 series the component layer

The design is held under 1 type certificate (E-304, held by Lycoming Engines). The FAA has issued 13 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 1 failure report with the FAA since 1995, 1 of them in the last ten years.

FAA orders 13 airworthiness directives · newest first

2026-04-082026-04-11 · Engine (Reciprocating) · engine
2024-12-052024-21-02 · Engine (Reciprocating) · engine
2022-08-152022-16-03 · Engine (RECIPROCATING) · engine
2012-03-272012-03-07 · Carburetor · engine
2004-06-252004-10-14 · Crankshaft gear · engine
1997-08-1297-15-11 · Cylinder kits · engine

All orders naming the Lycoming VO-540 series

Failure reports 1 since · what operators and shops told the FAA

00011108

Parts most often reported as the reports name them

Retainer1

Latest reports

2008-05-14Retainer: mismanufactured

Certificates and bulletins

E-304Type certificate held by Lycoming Engines · 21 models listed · revised November 4, 2010

Safety bulletins 2 · advice, not orders

2019-05-02NE-19-08 · Reciprocating Engine Cylinder Section - Lycoming Engines Parallel Valve Cylinders
2014-03-24NE-14-13 · Reciprocating Engine - Cylinder Mounting Studs

Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.

Connections how this engine series links to the rest of the register

Fitted to
Where they are
Biggest operators
Airworthiness

These connections as data: /graph/engine/lycoming-vo-540-series.json · about the eFlight graph.

Aircraft newest certificates first · 110

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N4415 Hiller
UH-12E
Rotorcraft Fort Wolters Helicopter INC
Mineral Wells, Texas
Restricted 1998-11-14 ValidFAA registration status code V: Valid registration. All codes
N14637 Hiller
UH-12E
Rotorcraft Fort Wolters Helicopter INC
Mineral Wells, Texas
Standard 1998-09-09 ValidFAA registration status code V: Valid registration. All codes
N5098Y Hiller
UH-12E
Rotorcraft Individual owner
Texas
Multiple 1994-07-25 ValidFAA registration status code V: Valid registration. All codes
N40277 Hiller
UH-12E
Rotorcraft Northwest Helicopters I INC
Olympia, Washington
Standard 1992-05-19 ValidFAA registration status code V: Valid registration. All codes
N180HA Hiller
UH-12E
Rotorcraft Ambrosini Helicopters INC
Fresno, California
Standard 1989-05-15 ValidFAA registration status code V: Valid registration. All codes
N5325V Hiller
UH-12E
Rotorcraft Individual owner
Washington
Multiple 1982-08-02 ValidFAA registration status code V: Valid registration. All codes
N132HA Hiller
UH-12E
Rotorcraft Sky Copters INC
Westmoreland, Kansas
Standard 1978-04-25 ValidFAA registration status code V: Valid registration. All codes
N238N Brantly
305
Rotorcraft Individual owner
Georgia
Standard PendingFAA registration status code R: Registration pending. All codes
N470WW Bell
47J-2A
Rotorcraft World Trade Enterprises LLC
Lucas, Texas
Standard ValidFAA registration status code V: Valid registration. All codes
N5362V Hiller
UH-12E
Rotorcraft Individual owner
Oklahoma
Standard Sale reportedFAA registration status code 7. All codes
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Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.