Merpati DHC6 at Dabra on Oct 17th 2011, runway excursion on roll out

Last Update: October 30, 2013 / 18:31:15 GMT/Zulu time

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Incident Facts

Date of incident
Oct 17, 2011

Classification
Report

Cause
Runway excursion

Airline
Merpati Nusantara Airlines

Flight number
MZ-9782D

Departure
Jayapura, Indonesia

Destination
Dabra, Indonesia

Aircraft Registration
PK-NUH

Aircraft Type
De Havilland DHC-6 Twin Otter

ICAO Type Designator
DHC6

A Merpati Nusantara de Havilland DHC-6-300 Twin Otter, registration PK-NUH performing flight MZ-9782D from Jayapura to Dabra (Indonesia) with 13 passengers, 2 crew and 1 aircraft maintenance engineer, was on approach to Dabra's runway 24 in clear weather, winds about 5-7 knots, with the first officer (CPL, 2,272 hours total, 2,272 hours on type) being pilot flying and the captain (ATPL, 8,917 hours total, no hours on type provided) was pilot monitoring. The aircraft touched down on runway 24 about 200 meters down the runway (still on grass portion of the runway), bounced for about 175 meters (now asphalt) then veered right off the runway hitting banana trees about 6.5 meters to the right of the runway edge, in the meantime the crew applied corrective inputs and returned the aircraft onto the runway about 120 meters after veering off, then the aircraft ground looped before coming to a stop about 35 meters short of the runway end and facing opposite to landing direction. No injuries occurred, the aircraft received substantial damage.

Indonesia's NTSC released their final report concluding the probable causes of the accident were:

The aircraft was most likely on un-stabilized approach and bounced during landing, veered to the right and recovered by directing a rolling on the shoulder and entering to the runway then stopped by a quick steep turning on the runway.

The NTSC reported that the lower foreward fuselage station 60 was twisted, the right wing received damage to the leading edge, the right main tyre burst, the left main gear was shifted backwards, the left upper and lower compressor blocks were broken.

The NTSC reported the first officer provided testimony that the aircraft was slightly higher than usual, when he sensed a tail wind and decided to reduce thrust more pronounced than normal, the descent rate increased and the aircraft bounced and veered to the right before the first officer regained control of the aircraft.

Dabra offers a runway 24 of 600 meters length, the first 300 meters are grassed and the second 300 meters covered with asphalt. Due to the runway condition the crew decided to aim for 200 meters down the runway.

The NTSC analysed: "It most likely that the aircraft was on un-stabilized approach during approach and landing"

The very same aircraft had endured another runway excursion about 15 months earlier, see Accident: Merpati DHC6 at Bintuni on Jul 18th 2010, rejected takeoff, runway excursion, nose gear collapse.
Incident Facts

Date of incident
Oct 17, 2011

Classification
Report

Cause
Runway excursion

Airline
Merpati Nusantara Airlines

Flight number
MZ-9782D

Departure
Jayapura, Indonesia

Destination
Dabra, Indonesia

Aircraft Registration
PK-NUH

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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