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ASN Wikibase Occurrence # 146927
Last updated: 25 June 2018
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Date:25-JUL-2012
Time:08:50
Type:Silhouette image of generic B36T model; specific model in this crash may look slightly different
Beechcraft B36TC Bonanza
Owner/operator:Private
Registration: N471BB
C/n / msn: EA-694
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Category:Accident
Location:Aurora Municipal Airport - KARR, Sugar Grove, IL -   United States of America
Phase: Take off
Nature:Private
Departure airport:Sugar Grove, IL (ARR)
Destination airport:Oshkosh, WI (OSH)
Investigating agency: NTSB
Narrative:
The pilot reported that shortly after takeoff, the airplane’s engine lost partial power and shook violently. The pilot elected to land the airplane in a cornfield off the end of the runway, where the it sustained substantial damage to both wings. A postaccident engine run performed with the engine still mounted on the airframe revealed no anomalies, but full-power testing could not be performed due to shortening of the propeller blades to facilitate the test. A mechanic who performed work on the engine after the accident reported that the turbocharger was full of oil and that the shaft appeared to be loose. As a result, the turbocharger was replaced with an overhauled unit. The mechanic also reported that the mechanical fuel pump was replaced after the accident but prior to arrival at the engine repair facility. It was reportedly replaced to correct a lean mixture condition, but the mechanic could not verify the reason. Based on the available information, the reason for the engine's partial loss of power could not be determined during the course of the investigation.
Probable Cause: The partial loss of engine power for reasons that could not be determined because postaccident testing and examination did not reveal any anomalies that would have precluded normal operation.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20120726X74043&key=1


Revision history:

Date/timeContributorUpdates
25-Jul-2012 14:19 Geno Added
25-Jul-2012 22:21 Geno Updated [Location, Narrative]
28-Jul-2012 13:21 FLYINGBROTHER1 Updated [Aircraft type]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 20:57 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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