Maker · data as of October 2, 2026

Irving Steven

2 aircraft on the U.S. register. The most recent registration was January 6, 2026.

THORP T-181IRBD-41

THORP T-18 · IRBD-4

Montana1Michigan1

Aircraft newest first

Tail no.	Maker and model	Group	Owner and base	Certificate	Registered	Status
N7173R	Irving Steven THORP T-18	Fixed-wing, single engine	Co-owned owner Michigan	Experimental	2026-01-06	Valid
N81TR	Irving Steven IRBD-4	Fixed-wing, single engine	Individual owner Montana	Experimental	2021-12-09	Valid