Accident Stinson 108-3 N798C,
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ASN Wikibase Occurrence # 356514
 
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Date:Sunday 3 November 1996
Time:14:30 LT
Type:Silhouette image of generic S108 model; specific model in this crash may look slightly different    
Stinson 108-3
Owner/operator:Private
Registration: N798C
MSN: 108-3798
Year of manufacture:1947
Total airframe hrs:1883 hours
Engine model:Franklin 6A4-165-BB
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:Tyler, TX -   United States of America
Phase: Approach
Nature:Private
Departure airport:Jacksonville, TX (JSO
Destination airport:(KTYR)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
According to the pilot, he observed the 'tachometer RPM changing drastically' while the airplane was on a 2 to 2.5 mile extended downwind leg for landing on runway 13. The pilot reported the anomaly to the tower, advising that he needed to land. The tower controller immediately issued the pilot a clearance to execute a left turn and proceed for a straight-in approach to runway 17. The pilot further stated that about 30 seconds after turning for runway 17, the engine started 'to make a loud popping and backfiring noise,' followed by total loss of power. The pilot notified the controller of his predicament and advised that he would not be able to reach the runway. The pilot elected to land the airplane on a nearby field to the right of his course, approximately 1.5 miles north of the threshold for runway 17. During the landing roll, the main gear hit a drainage ditch along the side of a road that crossed the field, and the airplane nosed over. Examination and teardown of the engine revealed that the crankshaft had failed in a heavy cast area (web) between the #1 and #2 rod journals.

Probable Cause: a loss of engine power due to failure of the crankshaft. A factor was the lack of suitable terrain for the forced landing.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: FTW97LA035
Status: Investigation completed
Duration: 3 months
Download report: Final report

Sources:

NTSB FTW97LA035

Revision history:

Date/timeContributorUpdates
13-Mar-2024 08:00 ASN Update Bot Added

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