# N4970Y: 2002 Yamokoski William GLASTAR - Status: Valid registration - Airframe: [Yamokoski William GLASTAR](https://openairdocs.org/model/yamokoski-william-glastar) (registry code 05614QM, 2 seats) - Engine: [Subaru ALL MDLS A/B](https://openairdocs.org/engine/subaru-all-mdls-a-b) (registry code 59050) - Serial number: 5377 - Year built: 2002 - Type: Fixed wing single engine - Engine type: Reciprocating - Kit: Stoddard Hamilton GLASTAR - Airworthiness: Experimental, amateur built - Airworthiness date: October 13, 2002 - Certificate issued: August 14, 2002 - Expires: January 31, 2028 - Mode S code: A62C88 - Registered owner: [Yamokoski William](https://openairdocs.org/faa-owner/YAMOKOSKI%20WILLIAM) - Location: [Saint Joseph, MI](https://openairdocs.org/faa-place/MI/Saint%20Joseph) - Owner type: Individual - Owner's area on the map: 42.0543° N, 86.4631° W: Placed by OpenAirDocs at the center of ZIP code 49085, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4970Y - Page: https://openairdocs.org/aircraft/N4970Y From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination. ## ADs that may apply (OpenAirDocs): 0 in force ### Matched by airframe (Yamokoski William GLASTAR) None in force. ### Matched by engine (Subaru ALL MDLS A/B) None in force. ## Information bulletins (advisory) None matched. ## NTSB investigations (2) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB CEN12LA470](https://openairdocs.org/ntsb/CEN12LA470), Jul 22, 2012: Yamokoski William Glastar (N4970Y), Chicago, IL, substantial damage. Probable cause: Failure of the automotive engine's reduction gearbox while in cruise flight. - [NTSB CHI05CA236](https://openairdocs.org/ntsb/CHI05CA236), Aug 21, 2005: Yamokoski Glastar (N4970Y), Marcellus, MI, substantial damage. Probable cause: The in-flight loss of engine power during cruise for undetermined reasons and the unsuitable terrain the pilot encountered during the forced landing. A factor was the tall corn he encountered. ## NTSB investigations on N4970Y not matched to an aircraft (2) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB ATL80FKG16](https://openairdocs.org/ntsb/ATL80FKG16), Jul 26, 1980: Piper PA-25 (N4970Y), Unadilla, GA, destroyed - [NTSB OAK74FVG34](https://openairdocs.org/ntsb/OAK74FVG34), Mar 23, 1974: Piper PA-25 (N4970Y), Davis, CA, substantial damage ## FAA accident and incident reports (2) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Accident 20120722016159A](https://openairdocs.org/incident/20120722016159A), Jul 22, 2012: Yamokoski William GLASTAR (N4970Y), Chicago, IL, Substantial damage. On July 22, 2012, at approximately 13:00 CDT, N4970Y an experimental amateur built Glastar, enroute from oshkosh, WI to benton harbor, mi declared an emergency… - [Accident 20050821024269A](https://openairdocs.org/incident/20050821024269A), Aug 21, 2005: Amtr GLASTAR (N4970Y), Marcellous, MI, Substantial damage. (-23) Pilot stated that aircraft engine started to run rough and quit running at 2800 feet MSL. Pilot landed aircraft in corn field. Aircraft flipped over upon… ## Reports on N4970Y not matched to an aircraft (2) They name N4970Y, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft. - [Accident 19800726030699A](https://openairdocs.org/incident/19800726030699A), Jul 26, 1980: Piper PA25235 (N4970Y), Unadilla, GA, Destroyed. Pulled up too late at end of swath run. Struck trees at edge of spray field. - [Accident 19740323006019A](https://openairdocs.org/incident/19740323006019A), Mar 23, 1974: Piper PA25235 (N4970Y), Davis, CA, Substantial damage. Brakes faded ldg on rough gravel road. ## Service difficulty reports None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model. ## STCs that may be installed (OpenAirDocs) None matched to this aircraft's models. ## Earlier aircraft with N4970Y The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N4970Y before. - [Cancelled (date not recorded)](https://openairdocs.org/deregistered/N4970Y-undated): Piper PA-25-235, S/N 254773. Triennial form not returned ## Related - Other Yamokoski William GLASTAR aircraft: https://openairdocs.org/model/yamokoski-william-glastar/aircraft.md - The Subaru ALL MDLS A/B engine: https://openairdocs.org/engine/subaru-all-mdls-a-b.md --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.