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ASN Wikibase Occurrence # 212008
Last updated: 27 November 2021
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Date:10-JUN-2018
Time:12:34
Type:Silhouette image of generic C182 model; specific model in this crash may look slightly different
Cessna 182A Skylane
Owner/operator:Private
Registration: N3889D
MSN: 34589
Fatalities:Fatalities: 0 / Occupants: 5
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Antonio (Nery) Juarbe Pol Airport (TJAB), Arecibo -   Puerto Rico
Phase: Unknown
Nature:Parachuting
Departure airport:Arecibo Airport (ARE/TJAB)
Destination airport:Arecibo Airport (ARE/TJAB)
Investigating agency: NTSB
Narrative:
The pilot stated that shortly after takeoff on the skydiving flight, the airplane's engine made a “clicking” sound and lost power. The pilot subsequently performed a forced landing to a field, during which the airplane flipped over and sustained substantial damage to the fuselage, right wing, and tail. Examination of the engine revealed the crankcase web mating surfaces at the Nos. 2, 3, and 4 bearing saddles exhibited pitting consistent with fretting, which was indicative of improper preloading (torque) of the through bolts. Additionally, the No. 2 main bearing was displaced from its saddle and severely worn, and the crankshaft fractured due to fatigue. A review of maintenance records revealed the engine's camshaft and lifters were replaced about 280 hours before the accident; this was the last documented time during which the applicable through bolts and associated nuts would have been assembled. Given this information, it is likely that maintenance personnel failed to properly apply torque to these through bolts during this maintenance, which ultimately resulted in the crankshaft failure and the subsequent loss of engine power.

Probable Cause: Maintenance personnel's failure to properly apply torque to the engine through bolts, which ultimately resulted in the crankshaft failure and the total loss of engine power.

Sources:

NTSB
https://uk.flightaware.com/resources/registration/N3889D

https://flightaware.com/live/flight/N3889D

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years
Download report: Final report


Images:


Photo: FAA

Revision history:

Date/timeContributorUpdates
11-Jun-2018 04:51 gerard57 Added
11-Jun-2018 05:04 gerard57 Updated [Aircraft type, Source]
11-Jun-2018 05:05 gerard57 Updated [Narrative]
11-Jun-2018 05:58 Anon. Updated [Country]
11-Jun-2018 05:59 Geno Updated [Time, Aircraft type, Cn, Location, Departure airport, Destination airport, Source, Narrative]
16-Jun-2020 18:58 ASN Update Bot Updated [Time, Country, Departure airport, Destination airport, Source, Narrative, Accident report, ]
16-Jun-2020 19:08 harro Updated [Location, Departure airport, Destination airport, Source, Narrative, Photo, Accident report, ]
16-Jun-2020 20:02 harro Updated [Aircraft type, Country, Accident report, ]

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