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ASN Wikibase Occurrence # 145100
 
This record has been locked for editing.

Date:16-APR-2012
Time:15:00
Type:Silhouette image of generic RV7 model; specific model in this crash may look slightly different    
Van's RV-7A
Owner/operator:Private
Registration: N5025G
MSN: 71591
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Berkeley County, WV -   United States of America
Phase: En route
Nature:Private
Departure airport:Martinsburg, WV (MRB)
Destination airport:Martinsburg, WV (MRB)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
According to the pilot, after about 2 1/2 hours of local flight, while maneuvering at 3,000 feet, the airplane's rotary engine coolant temperature rose. As the pilot turned the airplane back toward the departure airport, the engine seized and would not turn over during an attempted restart. The pilot performed a forced landing in a field, and the airplane nosed over. The pilot, who was also the airplane's builder, subsequently disassembled the engine and found that the stationary gear/bearing was frozen to the eccentric shaft. The pilot also reported that he had recently attempted to fine tune the engine by having the side and intermediate housings undergo lap grinding. The pilot knew the grinding would require wider spacers, which he used, but which may have still been insufficient in width. The insufficient width resulted in bearing oil hole misalignment on the eccentric shaft, which blocked oil from reaching the rotating engine and reduction drive shaft parts.
Probable Cause: The pilot/builder's misjudgment of the required spacer width needed after engine housing lap grinding, which resulted in bearing oil hole misalignment and insufficient internal engine lubrication.

Sources:

NTSB

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 9 months
Download report: Final report
Location


Images:

Photo of N5025G courtesy AirHistory.net


Fond du Lac - Fond du Lac County (KFLD / FLD)
31 July 2011; (c) Alex Christie

Revision history:

Date/timeContributorUpdates
17-Apr-2012 01:37 gerard57 Added
17-Apr-2012 04:33 RobertMB Updated [Time, Aircraft type, Registration, Location, Departure airport, Source, Narrative]
17-Apr-2012 08:54 RobertMB Updated [Aircraft type, Registration, Cn, Operator, Location, Source, Narrative]
02-May-2012 18:45 Geno Updated [Time, Aircraft type, Source, Narrative]
05-Sep-2016 04:13 junior sjc Updated [Aircraft type, Location, Source, Narrative]
07-Sep-2016 06:13 junior sjc Updated [Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
29-Oct-2017 19:39 junior sjc Updated [Location, Phase, Nature, Destination airport, Source, Narrative]
27-Nov-2017 20:35 ASN Update Bot Updated [Aircraft type, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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