Accident MBB BK 117C-1 N141LG,
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ASN Wikibase Occurrence # 92
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Date:Monday 3 December 2007
Type:Silhouette image of generic BK17 model; specific model in this crash may look slightly different    
MBB BK 117C-1
Owner/operator:Evergreen Helicopters of Alaska, Inc.
Registration: N141LG
MSN: 7503
Year of manufacture:1992
Total airframe hrs:11021 hours
Engine model:Turbomeca Arriel 1E2
Fatalities:Fatalities: 4 / Occupants: 4
Aircraft damage: Substantial
Location:3 mi E of Whittier, AK -   United States of America
Phase: En route
Departure airport:Cordova, AK (CKU)
Destination airport:Anchorage, AK
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The commercial helicopter pilot was on a visual flight rules (VFR) 14 Code of Federal Regulations Part 135 EMS (emergency medical service) patient transfer flight from a remote medical clinic in Alaska to a hospital in Anchorage when it collided with the ocean during instrument meteorological conditions. The flight entailed flying over and near ocean waters and mountainous terrain during dusk and night conditions without lighted ground references (such as buildings and street lights) due to the uninhabited topography. With the pilot and patient were a paramedic and a nurse. While crossing over a portion of ocean approaching rising terrain, the helicopter likely encountered low ceilings and snow squalls. With the pilot unable to discern either the shore or the ocean, it is probable he flew the helicopter under control into the ocean. Pieces of the helicopter and the body of the nurse were recovered several days after the accident. The rest of the helicopter and its occupants are presumed to have sunk in the ocean. There were no distress calls received from the pilot, and no history of any significant mechanical issues with the helicopter.

The accident flight was the pilot's first flight from this clinic, and this was his first winter season flying in Alaska. He had expressed his concern to a mechanic prior to the flight about flying over the accident route and water at night, and also told the nurse to bring his night vision goggles (NVGs) to assist him in seeing terrain. The pilot also had NVGs. It is unknown what weather information the pilot had when he elected to accept the flight. He had access to a company computer, and he and other company pilots routinely did their preflight weather planning using it. There is no record that he received any preflight weather briefing from the FAA, nor contacted them for weather information prior to his departure from the clinic, or sought weather updates while en route. It was night VFR when the pilot departed the clinic, but the weather had deteriorated near the accident site in close proximity to his departure time. The nearest reporting station was about 5 miles from the accident site. About 23 minutes before the accident, it was reporting instrument meteorological conditions with snow and low ceilings.

Aerial search efforts had to be delayed due to the poor weather. Neither the operator nor the hospital provided en route weather updates, or primary dispatch services. The hospital's procedure was to call the assigned EMS pilot to request a flight, and the pilot made the decision to either accept or reject the flight. Company procedures required that the pilot complete a risk assessment form prior to taking a flight. There was no risk assessment form found for the accident flight, and company management could not locate other risk assessment forms for previous EMS flights. An exemplar risk assessment form was completed by the NTSB investigator-in-charge using information that the pilot could reasonably expect to have known prior to accepting the flight. That information equated to a "Moderate" risk level, and required company management's concurrence to authorize the flight. Company management was not notified. The pilot was required to phone the hospital communications center at 10-minute intervals via satellite phone while en route, and when he did not call at the required time, a search was initiated.

The operator's main base was in Anchorage, and the EMS facility was in another Alaska town. The operator had not been assigned a principal operations inspector (POI) to oversee their operations until about 2 months prior to the accident. The POI had not inspected or visited the remote EMS location. Prior to the POI's assignment, the operator did not have a POI assigned for the preceding 22 months, but instead relied on various points of contact (POC) within the local FAA Flight Standards District Office to provide oversight. Investigation disclosed no evidence that any POC had visited the EMS facility. The operator also did not adhere to the proper procedures in tra
Probable Cause: The pilot's decision to continue VFR flight into night instrument meteorological conditions. Contributing to the accident were the operator's failure to adhere to an FAA-approved and mandated safety risk management program, the FAA's failure to provide sufficient oversight of the operator to ensure they were in compliance with the risk management program, the pilot's lack of experience in night winter operations in Alaska, and the operator's lack of an EMS dispatch and flight following system.

Accident investigation:
Investigating agency: NTSB
Report number: ANC08FA025
Status: Investigation completed
Download report: Final report




Revision history:

20-Jan-2008 11:39 JINX Added
20-Jan-2008 12:54 JINX Updated
16-Feb-2010 23:58 TB Updated [Aircraft type, Cn, Operator, Other fatalities, Location, Departure airport, Destination airport, Source, Narrative]
24-Jul-2010 23:11 Alpine Flight Updated [Aircraft type, Source]
19-Aug-2010 11:00 TB Updated [Time, Aircraft type, Location]
26-Mar-2013 08:14 TB Updated [Location, Source]
21-Dec-2016 19:12 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:13 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
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]
04-Dec-2017 19:02 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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