Piston helicopter

N174HM

Homebuilt J4B-2

Registered No accidents on file
Built
—
Serial
HM-174
Class
Piston helicopter
Engines
Continental O-200 series
Status
Current as of October 2026
Registered owner
Mid Atlantic Air Museum (Corporation)
Based
Reading, PA
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Registration record

N174HM on the FAA register

Type
Homebuilt J4B-2
Serial
HM-174
Engines
Continental O-200 series
Registered owner
Mid Atlantic Air Museum
Reading, PA
Certificate issued
2024-03-05
Airworthiness date
1989-05-11
Registration expires
2031-03-31
Airworthiness class
Experimental · amateur-built
Mode S (hex)
A128C4
Mode S (octal)
50224304
Seats (type)
2
Weight class
up to 12,499 lb
Status
Current as of October 2026
Registry history

Timeline

  • 2031-03-31
    Registration expires (renewal due).
  • 2024-03-05
    Certificate of registration issued as N174HM.
  • 1989-05-11
    Airworthiness date on the current FAA record (experimental category (amateur-built)).
Overview

About N174HM

N174HM is a Homebuilt J4B-2, serial number HM-174. The FAA register lists Mid Atlantic Air Museum as the registrant in Reading, Pennsylvania. The current certificate of registration was issued on March 5, 2024 and expires on March 31, 2031.

The FAA aircraft reference file describes the type as a piston helicopter, one Continental O-200 series engine and 2 seats. Its airworthiness certificate is experimental category (amateur-built), dated May 11, 1989.

No NTSB accident or incident reports and no FAA preliminary notices are on file for N174HM.

Safety record

Accident & incident history

✓ No NTSB accident or incident reports and no FAA preliminary notices on file for N174HM.

Sources: NTSB aviation accident database and CAROL case system, FAA preliminary accident & incident notices. Search accident records

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Browse: Aircraft registered in Pennsylvania· Registry by state· FAA registry stats

Data: FAA Aircraft Registry (October 2026), including deregistered aircraft; NTSB and FAA accident data; fyiAero listing history. Individual owners' names are shown to signed-in users and street addresses are never shown. Type figures are published specifications, not this aircraft's.