Loss of control Accident Yakovlev Yak-52 N644LL,
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ASN Wikibase Occurrence # 45524
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Date:Tuesday 18 June 2002
Type:Silhouette image of generic YK52 model; specific model in this crash may look slightly different    
Yakovlev Yak-52
Registration: N644LL
MSN: 833310
Total airframe hrs:1164 hours
Engine model:Ivchenko M14-P
Fatalities:Fatalities: 1 / Occupants: 1
Aircraft damage: Destroyed
Location:Antioch, CA -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Livermore Airport, CA (LVK/KLVK)
Destination airport:Concord-Buchanan Field, CA (CCR/KCCR)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
On June 18, 2002, at 1220 pacific daylight time, a Yakovlev Yak 52 single-engine aerobatic airplane, N644LL, was destroyed when it impacted terrain following a loss of control while maneuvering near Antioch, California. The airplane was registered to a private individual and operated by another private individual. The commercial pilot, sole occupant of the airplane, was fatally injured. Visual meteorological conditions prevailed, and a flight plan was not filed for the 14 Code of Federal Regulations Part 91 personal flight. The local flight originated from the Livermore Municipal Airport, near Livermore, California, at 1005, and was destined for the Buchanan Field (CCR), near Concord, California.

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.

Accident investigation:
Investigating agency: NTSB
Report number: LAX02LA202
Status: Investigation completed
Duration: 1 year and 9 months
Download report: Final report


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



Photos: NTSB

Revision history:

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]
20-Dec-2023 19:48 Captain Adam Updated [Departure airport, Destination airport, Narrative, Accident report, Photo]
20-Dec-2023 19:49 Captain Adam Updated [Photo]

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