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ASN Wikibase Occurrence # 68058
Last updated: 5 July 2020
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Date:25-AUG-2009
Time:09:56
Type:Silhouette image of generic C170 model; specific model in this crash may look slightly different
Cessna 170B
Owner/operator:Private
Registration: N6073V
C/n / msn: 25281
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Near Lake Hood, AK -   United States of America
Phase: Initial climb
Nature:Private
Departure airport:Anchorage, AK (Z41)
Destination airport:Wasilla, AK (IYS)
Investigating agency: NTSB
Narrative:
The private pilot was departing on a Title 14, CFR Part 91, personal flight. Witnesses reported that shortly after it became airborne, the right engine access cowling opened, and the airplane began a steep left turn back to the airport. As the airplaneís left bank increased, it descended nose first into tundra-covered terrain. The pilot said he could not specifically recall latching the cowling after preflighting the airplane, and that he should have climbed the airplane higher before returning to the airport. Examination of the airplane did not disclose any preimpact mechanical malfunction. Given the lack of mechanical deficiencies with the airplane's engine or flight controls, in conjunction with the witness and the pilotís statement, it is likely the pilot failed to properly latch the engine access cowling before takeoff, then failed to adequately maintain control of the airplane while returning to the airport after the cowling opened.
Probable Cause: The pilotís decision to make an abrupt and steep low altitude turn just after takeoff, while attempting to return to his departure airport, resulting in an aerodynamic stall and loss of aircraft control. Contributing to the accident was the pilotís failure to ensure that the airplaneís engine access cowling was properly latched before takeoff.


Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20090825X90626&key=1


Revision history:

Date/timeContributorUpdates
26-Aug-2009 02:12 RobertMB Added
26-Aug-2009 02:17 RobertMB Updated
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
02-Dec-2017 15:58 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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