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

Lycoming VO-540-C2A

6 aircraft on the U.S. register carry a Lycoming VO-540-C2A engine, rated at about 315 horsepower. The Hiller UH-12 is the model most often fitted with it (6 aircraft). The aircraft carrying it were built between 1959 and 1964.

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-C2A. FAA spelling: VO-540-C2A.

Fitted to model families

Hiller UH-126

Hiller UH-12

Where they are owner's state

Oklahoma2Arizona2Virginia1Texas1

Kind of aircraft

Helicopters6 (100%)

When the aircraft were built by decade

001221195021960

What the FAA has certified, ordered and been told about the Lycoming VO-540-C2A the component layer

The FAA has issued 5 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 22 failure reports with the FAA since 1995, 4 of them in the last ten years.

FAA orders 5 airworthiness directives · newest first

2026-04-082026-04-11 · Engine (Reciprocating) · engine
1980-08-1880-04-04 R1 · Crankshaft Flange Bolts · engine
1977-01-1373-23-01 · Piston Pin Assembly · engine
1974-07-0973-05-01 · Connecting Rod Bearing Assemblies · engine
1968-05-1968-08-08 · Hydraulic Valve · engine

Failure reports 22 since · what operators and shops told the FAA

0258109697000102030609112

Parts most often reported as the reports name them

Hub3Carburetor2Gear2Bearing1Bolt1Control Cable1Control Rotor1Crankcase1Crosstube1Cylinder1

Latest reports

2012-05-29Crosstube: broken
2009-02-20Spar: cracked
2006-04-12Hub: cracked
2003-04-09Control Cable: failed
2002-06-14Screw: failed

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-c2a.json · about the eFlight graph.

Aircraft newest certificates first · 6

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N90457 Hiller
UH-12L4
Rotorcraft Hiller Aviation Group INC
Laveen, Arizona
Restricted 2023-12-27 ValidFAA registration status code V: Valid registration. All codes
N922HA Hiller
UH-12E
Rotorcraft Hiller Aviation Group INC
Laveen, Arizona
Standard 2023-12-27 ValidFAA registration status code V: Valid registration. All codes
N16NR Hiller
UH-12E
Rotorcraft Paragon Helicopter Services LLC
Claremore, Oklahoma
Standard 2023-06-14 ValidFAA registration status code V: Valid registration. All codes
N9737C Hiller
UH-12E
Rotorcraft M&D Aerial LLC
Coleman, Texas
Restricted 2022-02-01 ValidFAA registration status code V: Valid registration. All codes
N875WE Hiller
UH-12E
Rotorcraft Eastern Stearman INC Trustee
Leesburg, Virginia
Standard 2019-10-10 ValidFAA registration status code V: Valid registration. All codes
N22SP Hiller
UH-12E
Rotorcraft Paragon Helicopter Services LLC
Claremore, Oklahoma
Standard 2010-08-20 ValidFAA registration status code V: Valid registration. All codes

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.