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ASN Wikibase Occurrence # 45524
Last updated: 14 November 2020
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Date:18-JUN-2002
Time:12:20
Type:Silhouette image of generic YK52 model; specific model in this crash may look slightly different
Yakovlev Yak-52
Owner/operator:Private
Registration: N644LL
C/n / msn: 833310
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Antioch, CA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Private
Departure airport:Livermore, CA
Destination airport:Concord, CA (CCR)
Investigating agency: NTSB
Narrative:
A witness located north east of the accident site, observed the airplane "starting a vertical climb, slowly rolling over and diving straight down." The witness stated that the airplane "never appeared to be trying to pull out of the dive." Subsequently, the witness lost sight of the airplane behind a mountain, and heard the "sound of impact." Examination of the wreckage revealed a screwdriver located in the aft section of the fuselage. Multiple witness marks were observed around the elevator bellcrank housing, and numerous gouges on the screwdriver. When the screwdriver was placed between the elevator bellcrank and housing, and the bellcrank moved by hand, the elevator control was restricted to the neutral position. The energy dispersive x-ray spectroscopy analysis performed on the screwdriver conclusively demonstrated that the screwdriver was lodged between the various structural items.
Probable Cause: The loss of control while performing acrobatic maneuvers due to a screwdriver restricting elevator travel. A contributing factor was the airplane's fuselage not being sterile of foreign objects.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20020619X00925&key=1


Revision history:

Date/timeContributorUpdates
28-Oct-2008 00:45 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
09-Dec-2017 16:49 ASN Update Bot Updated [Source, Narrative]

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