The U.S. aircraft register, updated daily
Engines · piston (reciprocating) · data as of October 29, 2026

Hirth HM 504

3 aircraft on the U.S. register carry a Hirth HM 504 engine, rated at about 100 horsepower. The Bucker-Jungman 131 is the model most often fitted with it (1 aircraft).

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 Hirth HM 504. FAA spelling: HM 504.

Fitted to model families

Bucker-Jungman 1311Johnson Douglas P CHALLENGER II1Moravan ZLIN 3811
Model families, as a table
aircraft
Bucker-Jungman 1311
Johnson Douglas P CHALLENGER II1
Moravan ZLIN 3811

Bucker-Jungman 131 · Johnson Douglas P CHALLENGER II · Moravan ZLIN 381

Where they are owner's state

Florida2Kansas1
By state, as a table
aircraft
Florida2
Kansas1

Kind of aircraft

Piston singles3 (100%)
By kind, as a table
aircraftshare
Piston singles3100%

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

Fitted to
Where they are
Analytics

The whole map of how records connect · these connections as data: /graph/engine/hirth-hm-504.json.

Aircraft newest certificates first · 3

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N52DJ Johnson Douglas P
CHALLENGER II
 Fixed-wing, single engine Individual owner
Kansas
 Experimental 2021-05-19 ValidFAA registration status code V: Valid registration. All codes
N181BU Moravan
ZLIN 381
 Fixed-wing, single engine Individual owner
Florida
 Experimental 1997-12-09 ValidFAA registration status code V: Valid registration. All codes
N41455 Bucker-Jungman
131
 Fixed-wing, single engine Individual owner
Florida
 Experimental 1997-06-18 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 29, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.