Daily DHC6 at Orchid Island on Apr 13th 2017, runway excursion
Last Update: March 28, 2018 / 15:43:30 GMT/Zulu time
Incident Facts
Date of incident
Apr 13, 2017
Classification
Accident
Cause
Runway excursion
Airline
Daily Air
Flight number
DA-7511
Departure
Taitung, Taiwan
Destination
Orchid Island, Taiwan
Aircraft Registration
B-55571
Aircraft Type
De Havilland DHC-6 Twin Otter
ICAO Type Designator
DHC6
The airline reported the cause of the accident is yet to be determined, however, wind shear was a possibility. The captain was an experienced pilot with more than 5000 hours of flight experience.
Local firefighters reported they treated 4 passengers after the aircraft went off the runway and impacted a fence, none of the passengers was taken to a hospital.
No Metars are available, the local weather station reported at 14:00L: visibility 10km, winds from north at 10 knots, overcast cloud, 19 degrees C, dew point 17 degrees C, QNH 1016. At 17:00L the weather station reported visibility 10km, winds from north at 8 knots, overcast cloud, 19 degrees C, dew point 17 degrees C, QNH 1016.
On Apr 14th 2017 Taiwan's ASC reported B-55571 landed on runway 13 but exited the runway and collided with a guardrail. There were no injuries, the aircraft received substantial damage. The ASC opened an investigation and have dispatched 7 investigators on site.
On Mar 28th 2018 the ASC released their executive summary of the final report concluding the probable cause of the accident was:
Findings related to probable causes
- 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.
- 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.
- 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.
The investigation further found (amongst others):
- In the final approach and landing phase of the occurrence aircraft, moderate wind shear and approximately moderate turbulence were encountered, but the left crosswind and the tail wind encountered did not exceed the limits of the aircraft.
- There were two events related to aircraft drifting off to the left with both power levers not matched of the occurrence aircraft during landing roll. After the maintenance actions were taken on March 24 2017, the discrepancies were rectified and similar event did not occur again before this occurrence. These two previous mentioned events were not related to the occurrence.
- The occurrence Captain and Daily Air’s DHC-6-400 flight crew were still in the initial stage of accumulating flying experience of the type aircraft. Their experience and familiarity of applying differential power for directional control during landing were still very limited, and that their opinions about timing and willingness on those were also diverse.
- With regard to the issue of applying differential power during landing, Daily Air did not provide detailed guidance on using differential power during landing to flight crew, or specifically instruct and assure them the technique and timing of using it during transition training. Nor did Daily Air request flight crew to study and discuss this issue in relevant technical meetings.
Incident Facts
Date of incident
Apr 13, 2017
Classification
Accident
Cause
Runway excursion
Airline
Daily Air
Flight number
DA-7511
Departure
Taitung, Taiwan
Destination
Orchid Island, Taiwan
Aircraft Registration
B-55571
Aircraft Type
De Havilland DHC-6 Twin Otter
ICAO Type Designator
DHC6
This article is published under license from Avherald.com. © of text by Avherald.com.
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