Tuesday, March 21, 2017

Swearingen SA226TC, Western Airlines, N158WA: Accident occurred March 20, 2017 at Boise Airport (KBOI), Idaho

The NTSB did not travel to the scene of this accident.

Additional Participating Entity: 
Federal Aviation Administration / Flight Standards District Office; Boise, Idaho

Aviation Accident Preliminary Report / National Transportation Safety Board:  https://app.ntsb.gov/pdf

Western Airlines: http://registry.faa.gov/N158WA

NTSB Identification: WPR17LA078
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Monday, March 20, 2017 in Boise, ID
Aircraft: SWEARINGEN SA226, registration: N158WA
Injuries: 1 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On March 20, 2017, about 0400 mountain daylight time, a Swearingen SA226TC, N158WA, was substantially damaged due to foreign object damage to the airplane's propeller and fuselage during initial takeoff/climb from Boise Air Terminal/Gowen Field (BOI), Boise, Idaho. The airline transport pilot, who was the sole occupant, was not injured. The airplane was registered to and operated by Western Airlines LC of Boise. Visual meteorological conditions prevailed at the time of the accident, and an instrument flight rules flight plan was filed, but not activated. The charter cargo flight was being operated in accordance with 14 Code of Federal Regulations Part 135, with a destination of Centinnial Airport (APA), Denver, Colorado.

According to Federal Aviation Administration personnel, about the time the airplane was rotating from Runway 10L, the pilot experienced a light vibration; he subsequently returned to BOI and landed uneventfully. During a post-landing examination of the airplane, it was revealed that a portion of the outboard section of a left propeller blade, which had fragmented into 2 pieces, was missing. Additionally, about a 4 inch by 4 inch puncture hole was observed to have gone through the left forward side of the fuselage just aft of the main air stair door; a piece of the propeller blade was found in the cabin. It was further noted during a runway sweep for foreign objects shortly after the occurrence, that a screw driver which had been used during maintenance on the airplane earlier, and the second piece of the propeller blade tip, were both recovered from the departure runway in the same approximate location from where the airplane would have rotated.

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