ASN Aircraft accident Viking Air DHC-6 Twin Otter 400 B-55571 Orchid Island Airport (KYD)
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Status:Accident investigation report completed and information captured
Date:Thursday 13 April 2017
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
Viking Air DHC-6 Twin Otter 400
Operator:Daily Air
Registration: B-55571
MSN: 874
First flight: 2013
Total airframe hrs:1822
Engines: 2 Pratt & Whitney Canada PT6A-34
Crew:Fatalities: 0 / Occupants: 2
Passengers:Fatalities: 0 / Occupants: 17
Total:Fatalities: 0 / Occupants: 19
Aircraft damage: Substantial
Aircraft fate: Repaired
Location:Orchid Island Airport (KYD) (   Taiwan)
Phase: Landing (LDG)
Nature:Domestic Scheduled Passenger
Departure airport:Taitung Airport (TTT/RCFN), Taiwan
Destination airport:Orchid Island Airport (KYD/RCLY), Taiwan
Daily Air flight 7511, a DHC-6-400 airplane, took off at 16:10 local time from Tatung Airport for a scheduled passenger flight to Orchid Island Airport. The flight was cleared for approach and landing on runway 13.
In the final approach and landing phase moderate wind shear and moderate turbulence were encountered. The left crosswind and the tail wind encountered did not exceed the limits of the aircraft.

After touchdown the aircraft veered off the left side of the runway and hit a barrier on one side of the runway nose-first, damaging its nose, left engine and wing.

Probable Cause:

Findings related to probable causes:
1. The occurrence aircraft performed the final approach in left crosswind and landed with its nose yawing to the left. It was probably affected by the clockwise horizontal wind shear on the runway and pilot's operation, the aircraft began drifting to the left after touching down.
2. As the aircraft was drifting to the left, the Captain had used right rudder to correct the deviation, and also pulled the power levers into the reverse range. According to the recorded engine data of torque and (reverse) power of both engines, it revealed that the Captain inadvertently pulled back the left power lever while he was intending to apply the right-turning differential power to assist him in correcting the left drift. It resulted in increasing the left reverse power and intensified the aircraft’s left drifting tendency.
3. Though the Captain attempted to get the directional control of aircraft by increasing the right rudder input and the right wheel brake pressure, however he still kept increasing the reverse power of left engine to the maximum, not knowing that he was taking the wrong side. Consequently, the aircraft veered off the runway, hit the fence and caused aircraft substantial damage.

Accident investigation:

Investigating agency: ASC Taiwan
Status: Investigation completed
Duration: 1 years
Accident number: ASC-AOR-18-03-002
Download report: Final report

Runway excursion (veer-off)

» Focus Taiwan

Follow-up / safety actions

ASC issued 12 Safety Recommendations

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This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Taitung Airport to Orchid Island Airport as the crow flies is 92 km (57 miles).
Accident location: Approximate; accuracy within a few kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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