Single-engine piston

N7173R

Homebuilt Thorp T-18

Registered No accidents on file
Built
—
Serial
4525
Class
Single-engine piston
Engines
Lycoming O-320 series
Status
Current as of October 2026
Registered owner
Co-owned · sign in to see
Based
Clinton, MI
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Registration record

N7173R on the FAA register

Type
Homebuilt Thorp T-18
Serial
4525
Engines
Lycoming O-320 series
Registered owner
Co-owned — the name of an individual registrant is shown to signed-in users. Sign in
Clinton, MI
Certificate issued
2026-01-06
Airworthiness date
1997-10-02
Registration expires
2033-01-31
Airworthiness class
Experimental · amateur-built
Mode S (hex)
A998DF
Mode S (octal)
52314337
Seats (type)
2
Weight class
up to 12,499 lb
Status
Current as of October 2026
Registry history

Timeline

  • 2033-01-31
    Registration expires (renewal due).
  • 2026-01-06
    Certificate of registration issued as N7173R to the current registrant.
  • 2000-11-30
    N7173R previously assigned to a Piper Cherokee 140 / PA-28 Cherokee / Cherokee 160 (s/n 28-21883); cancelled.
  • 1997-10-02
    Airworthiness date on the current FAA record (experimental category (amateur-built)).
Overview

About N7173R

N7173R is a Homebuilt Thorp T-18, serial number 4525. It is registered to co-owners in Clinton, Michigan. The current certificate of registration was issued on January 6, 2026 and expires on January 31, 2033.

The FAA aircraft reference file describes the type as a single-engine piston, one Lycoming O-320 series engine and 2 seats. Its airworthiness certificate is experimental category (amateur-built), dated October 2, 1997.

No NTSB accident or incident reports and no FAA preliminary notices are on file for this airframe as N7173R. 1 earlier record involves a different aircraft that carried the same N-number.

Safety record

Accident & incident history

1999-05-10 Accident · Rock Hill, SC Damage: Substantial NTSB · MIA99LA153
Reported aircraft: Piper PA-28-140 — a different aircraft that carried the N7173R registration before this airframe.
Probable cause: The pilot's failure to maintain directional control. Related factors were the crosswind and the pilot's lack of experience.

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 Michigan· 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.