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ASN Wikibase Occurrence # 151145
Last updated: 16 October 2019
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Date:10-DEC-2012
Time:19:50
Type:Silhouette image of generic DA40 model; specific model in this crash may look slightly different
Diamond DA40 Diamond Star
Owner/operator:Private
Registration: N840DS
C/n / msn: 40.875
Fatalities:Fatalities: 1 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Lake Park, Lowndes County, GA -   United States of America
Phase: En route
Nature:Executive
Departure airport:Valdosta, GA (VLD)
Destination airport:Jesup, GA (JES)
Investigating agency: NTSB
Narrative:
Before departing at night for his destination airport, the noninstrument-rated pilot received a weather briefing, which advised of marginal visual flight rules (MVFR) conditions. The briefing also included an airmenís meteorological information advisory for developing instrument flight rules conditions due to low ceilings and mist. Shortly after takeoff, the pilot contacted a radar approach controller for visual flight rules flight-following services, and he was advised to squawk a beacon code,†but, before the approach controller was able to identify the airplane on the radar, the pilot radioed, ďIím in trouble.Ē Shortly after, both radar and radio contact were lost. Review of radar data indicated that the airplaneís climb rate was steady until the airplane reached an altitude of about 2,100 ft msl. The airplane then began descending rapidly while turning right until it impacted terrain.
Examination of the wreckage did not reveal any evidence of preimpact failures or malfunctions of the engine or primary flight controls. However, examination of the elevator trim system revealed that the elevator trim cable was disconnected from the trim control wheel in the cockpit and that it had pulled out of a swaged rod end (bolt), which displayed a longitudinal crack on the outer surface of the swage. Examination of the fracture surface revealed that the fracture occurred due to overstress. The examinations were not able to determine if the cable pulled out of the fitting during the accident sequence or if it was a pre-existing condition. Regardless, review of the elevator pitch control system revealed that, even if the elevator trim cable had disconnected in flight, it should not have led to an uncontrollable situation due to its redundant design.
At the time of the accident, both the sun and the moon were more than 15 degrees below the horizon. Further, warm, moist southerly wind ahead of an approaching cold front was producing variable clouds, and a band of low stratiform clouds with their tops near 4,000 ft existed over the area. Operating in MVFR conditions increases a pilotís workload and stress level because navigation becomes more difficult and reduces the margin of safety. As a result of the increased workload and stress level and the pilotís minimal simulated instrument time (about 7 hours); his minimal night experience (about 3 hours); the dark, night MVFR conditions; restricted visibility, including a lack of ambient light; and the sustained right turn and descent, it is likely the pilot experienced spatial disorientation and subsequently lost control of the airplane.

Probable Cause: The noninstrument-rated pilotís improper decision to depart in dark, night marginal visual flight rules conditions, which resulted in his spatial disorientation and subsequent loss of airplane control.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20121211X41020&key=1
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=840DS


Revision history:

Date/timeContributorUpdates
11-Dec-2012 08:36 gerard57 Added
11-Dec-2012 10:40 gerard57 Updated [Source, Damage, Narrative]
11-Dec-2012 11:29 gerard57 Updated [Aircraft type, Source, Narrative]
12-Dec-2012 08:59 Geno Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Departure airport, Source, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
28-Nov-2017 14:00 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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