ASN Wikibase Occurrence # 262176
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| Date: | Thursday 20 May 2021 |
| Time: | 09:30 |
| Type: |  Mooney M20K 231 |
| Owner/operator: | Registration Pending |
| Registration: | N9514R |
| MSN: | 25-0484 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 3575 hours |
| Engine model: | Continental TSIO 360 GB1 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Dawson Municipal Airport (16J), Dawson, GA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Orlando Apopka Airport, FL (X04) |
| Birmingham-Shuttlesworth International Airport, AL (BHM/KBHM) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On May 20, 2021, about 0930 eastern daylight time, a Mooney M20K, N9514R, was substantially damaged when it was involved in an accident near Dawson Municipal Airport (16J), Dawson, Georgia. The pilot and passenger sustained serious injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.
The pilot reported that, while en route to the destination airport, the airplane lost total engine power. The pilot declared an emergency with air traffic control and began to divert to the nearest airport. The pilot recognized that the airplane would not be able to glide to the airport, and he decided to land on a road with the landing gear and flaps retracted. The pilot and passenger sustained serious injuries, and the airplane was substantially damaged.
A postaccident teardown examination of the engine revealed that the No. 4 connecting rod was fractured midspan. One of the No. 4 connecting rod bolt nuts was found in the oil pan and exhibited no signs of pre- or postaccident damage. The cotter pin for that nut was not found; the other No. 4 connecting rod nut was found secured to its bolt with the cotter pin installed. Additionally, all other connecting rod bolt nuts remained attached to their respective bolts with cotter pins in place. Thus, it is likely that the nut found in the oil pan was not secured with a cotter pin and that the unsecured No. 4 connecting rod bolt nut became loose over time and backed out of the connecting rod bolt during the accident flight, resulting in the total loss of engine power.
Review of maintenance records revealed that the engine had accumulated about 1,240 hours of operation since major overhaul, which was completed more than 28 years before the accident. The engine manufacturer recommended that the engine be overhauled every 2,000 hours or 12 calendar years, whichever occurred first. The investigation could not determine when the No. 4 connecting rod nut was installed without a cotter pin.
Probable Cause: Maintenance personnel’s failure to properly secure the No. 4 connecting rod bolt nut with a cotter pin, resulting in a total loss of engine power.
Accident investigation:
 |
|
Sources:
https://www.walb.com/2021/05/20/plane-makes-crash-landing-so-ga/
NTSB
https://registry.faa.gov/aircraftinquiry/Search/NNumberResult
https://flightaware.com/live/flight/N9514R
https://www.airport-data.com/aircraft/photo/001137160.html
History of this aircraft
Other occurrences involving this aircraft
| 31 August 1991 | N9514R | Private | 0 | Burlington, WI | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-May-2021 19:07 | Geno | Added |
| 22-Jun-2023 21:11 | Captain Adam | Updated |
Corrections or additions? ... Edit this accident description
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