Date:	Friday 10 September 1999
Time:	14:45 LT
Type:	Eurocopter AS 350B2
Owner/operator:	Temsco Helicopters, Inc.
Registration:	N6052C
MSN:	2586
Year of manufacture:	1991
Total airframe hrs:	3727 hours
Engine model:	Turbomeca Arriel 1D1
Fatalities:	Fatalities: 0 / Occupants: 2
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Juneau Ice Field, 17 mls N of Juneau, Alaska -   United States of America
Phase:	Manoeuvring (airshow, firefighting, ag.ops.)
Nature:	Unknown
Departure airport:	, AK (KJNU)
Destination airport:
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
The commercial helicopter pilot, with one passenger aboard, was conducting a search for an overdue company helicopter. While searching the upper portion of a glacial ice field, deteriorating weather conditions required the pilot to alter his search route. He said that he slowed the helicopter to 15 knots and attempted to use a mountain range on the right side of the helicopter for visual reference. He said: 'Visibility in front was enough to see all the way to the top of the Herbert (greater than three miles). The ceiling sloped down to the east 45 degrees with a height at the ridge of approximately 700 feet.' The pilot added that just seconds before the impact, he thought the helicopter was at least 500 feet above the surface. He said that 'flat light conditions' made it very difficult to see the topographical features of the ice field below. The helicopter struck the snow-covered ice field, slid about 75 feet, and the helicopter rolled over to the right. The helicopter sustained substantial damage to the fuselage, tail boom, and rotor system. After the accident, the pilot radioed for another company helicopter to pick them up. A second company helicopter, N6099Y, landed at the accident site, boarded the uninjured pilot and passenger, and continued the search. During the search, N6099Y also collided with the snow-covered ice field. See ANC99FA139, and ANC99LA141. The accident pilot did not possess an instrument rating, and the helicopter was not equipped with a radar altimeter.

Probable Cause: The pilot's failure to maintain altitude/clearance. Factors associated with the accident were flat light conditions, snow-covered terrain, and self-induced pressure to continue the search.

NTSB ANC99LA140
FAA register: NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20001212X19666&key=1
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=6052C

Date/time	Contributor	Updates
27-Sep-2008 01:00	ASN archive	Added
29-Jun-2014 23:00	Dr. John Smith	Updated [Time, Operator, Total fatalities, Total occupants, Location, Source, Narrative, ]
07-Jul-2014 22:27	Dr. John Smith	Updated [Date, Time, Registration, Cn, Operator, Total fatalities, Total occupants, Location, Country, Nature, Departure airport, Destination airport, Source, Narrative, ]
07-Jul-2014 22:32	Dr. John Smith	Updated [Date, ]
21-Dec-2016 19:14	ASN Update Bot	Updated [Time, Damage, Category, Investigating agency, ]
21-Dec-2016 19:16	ASN Update Bot	Updated [Time, Damage, Category, Investigating agency, ]
21-Dec-2016 19:20	ASN Update Bot	Updated [Time, Damage, Category, Investigating agency, ]
14-Dec-2017 09:26	ASN Update Bot	Updated [Operator, Nature, Departure airport, Destination airport, Source, Narrative, ]
07-Apr-2024 18:05	ASN Update Bot	Updated [Time, Other fatalities, Phase, Departure airport, Source, Narrative, Category, Accident report, ]