Single-engine piston

N478SX

2004 Homebuilt Sonex

Registered 1 NTSB/FAA record
Built
2004
Serial
478SX
Class
Single-engine piston
Engines
Ama/Expr UNKNOWN ENG
Status
Current as of October 2026
Registered owner
Individual · sign in to see
Based
Lake Mills, WI
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Registration record

N478SX on the FAA register

Type
2004 Homebuilt Sonex
Serial
478SX
Engines
Ama/Expr UNKNOWN ENG
Registered owner
Individual — the name of an individual registrant is shown to signed-in users. Sign in
Lake Mills, WI
Certificate issued
2025-02-07
Airworthiness date
2004-07-07
Registration expires
2032-02-29
Airworthiness class
Experimental · amateur-built
Mode S (hex)
A5E078
Mode S (octal)
51360170
Seats (type)
2
Weight class
up to 12,499 lb
Kit
Sonex Ltd SONEX
Status
Current as of October 2026
Registry history

Timeline

  • 2032-02-29
    Registration expires (renewal due).
  • 2025-02-07
    Certificate of registration issued as N478SX.
  • 2004-11-21
    Accident at Oconomowoc, WI; damage: substantial.
  • 2004-07-07
    Airworthiness date on the current FAA record (experimental category (amateur-built)).
Overview

About N478SX

N478SX is a 2004 Homebuilt Sonex, serial number 478SX. It is registered to an individual in Lake Mills, Wisconsin. The current certificate of registration was issued on February 7, 2025 and expires on February 29, 2032.

The FAA aircraft reference file describes the type as a single-engine piston, one Ama/Expr UNKNOWN ENG engine and 2 seats. Its airworthiness certificate is experimental category (amateur-built), dated July 7, 2004.

N478SX has 1 accident/incident record on file (most serious damage: substantial); details are below.

Safety record

Accident & incident history

2004-11-21 Accident · Oconomowoc, WI Damage: Substantial Serious injury NTSB · CHI05CA032
Reported aircraft: Olson Sonex
Probable cause: The loss of engine power due to a fatigue fracture of the crankshaft. An additional cause to the accident was the pilot/builder's failure to verify the dimensions of the shrink-fit crankshaft components prior reassembling the engine. A factor to the accident was the ditch encountered during the forced landing.

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 Wisconsin· 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.