Eurocopter BK117-C1 N313LS

Summary

On 20 July 2001 at about 21:03 local time, a Eurocopter BK117-C1 registered N313LS, operated by Omniflight Helicopters, Inc., was involved in an accident near Decatur, Texas, United States. 3 people were on board and 2 were seriously injured, one had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

20 July 2001 at 21:03

Classification

Accident

Location

Decatur, Texas, United States

Coordinates

33.2850, -97.6167

Aircraft

Eurocopter BK117-C1

Registration

N313LS

Category

Helicopter

Engines

2

Operator

Omniflight Helicopters, Inc.

Operating rule

Part 91: General Aviation

Purpose of flight

Positioning

Phase of flight

Not recorded

Route

Dallas → Wichita Falls

Aircraft damage

Substantial

Weather

VMC

NTSB number

FTW01LA166

2 people were seriously injured.

the pilot's failure to follow the checklist and turn on the fuel transfer pumps, which resulted in fuel starvation and a dual loss of engine power while in cruise flight.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The twin-engine helicopter departed on a positioning flight to pick up a medical patient. While in cruise flight, at 2,000 feet, both engines experienced a total loss of power. The pilot attempted to autorotate to a field; however, the helicopter impacted trees and came to rest on its right side. The pilot reported that he did not notice any warning lights immediately prior to or during the loss of engine power events. However, it was noted during a post-accident examination of the helicopter that the pilot instrument light and console light variable resistor control was in the ON position. This control dims the master caution and annunciator panel lights for night operations. The NTSB IIC noted that the master caution and annunciator lights were not visible in daylight with the pilot and console variable resistor control in the ON position. Although the two fuel transfer pump switches were found in the ON (normal operating) position, examination of the fuel system provided evidence that the dual engine power loss was the result of fuel starvation due to these switches not being ON during the majority of the flight. The fuel supply lines to the engines were found empty, a nominal amount of fuel was found in the fuel filters, and the fuel quantity indicator displayed 4, 0, and 15 gallons of fuel in the #1 supply, #2 supply, and forward main fuel tanks, respectively. The function of the fuel transfer pumps is to transfer fuel from the forward main tank to the two supply tanks. The fuel transfer pumps were operated during the post-accident examination by turning on their respective switches and it was noted that fuel began to flow into the supply tanks. Additionally, it was noted that the fuel transfer pump caution lights (which are illuminated when the pumps are off) extinguished when the pumps were turned on. The engines were placed in a test cell and both operated with no anomalies noted. The normal operating checklist calls, in part, for the pilot to set the instrument lights as required, test the annunciator panel for operation, and turn on the transfer pumps after engine start.

Quoted verbatim from the NTSB record.