Bagan AT72 at Yangon on Jul 24th 2015, runway excursion on landing

Last Update: November 2, 2017 / 19:28:33 GMT/Zulu time

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Incident Facts

Date of incident
Jul 24, 2015

Classification
Accident

Airline
Air Bagan

Flight number
W9-424

Destination
Yangon, Myanmar

Aircraft Registration
XY-AIH

Aircraft Type
ATR ATR-72-200

ICAO Type Designator
AT72

Airport ICAO Code
VYYY

An Air Bagan Avions de Transport Regional ATR-72-200, registration XY-AIH performing flight W9-424 from Mandalay to Yangon (Myanmar) with 49 passengers and 5 crew, landed on Yangon's runway 21 in heavy rain at about 17:30L (11:00Z) but veered left off the runway and came to a stop with all gear off the paved surface of the runway about 1100 meters down the runway, past taxiway D, between the runway and parallel taxiway A. One passenger received a serious injury.

Photos showing the aircraft during removal in the night suggest, that the aircraft had come to a stop with left main and nose gear collapsed. The removal works concluded by about 21:45L and the airport returned to service.

On Jul 28th 2015 the French BEA reported in their weekly bulletin the left main gear collapsed upon touchdown causing the aircraft to veer left and come to a stop between taxiway A and D about 75 feet off the runway edge with the nose gear collapsed. One person received minor injuries, the aircraft received substantial damage. Myanmar's Accident Investigation Board is investigating the occurrence rated an accident.

Myanmar Aircraft Investigation Bureau (MAIB) released their final report concluding the probable causes of the accident were:

Primary Cause

During the final landing phase, the pilot was reluctant to perform a go-around while the plane was unstable and of bounce landing in low visibility condition.

Contributing Factors

a) The visibility was very low and the runway centerline lightings were not able to be seen intermittently.
b) The runway was wet and it was raining heavily.
c) The pilot in command took over the control of the plane from the copilot (14) seconds just before the first impact.

The MAIB reported the first officer (33, ATPL, 2,650 hours total, 2,650 hours on type) was pilot flying, the captain (39, ATPL, 6,603 hours total, 512 hours on type) was pilot monitoring.

The aircraft was stabilized on approach to runway 21, tower had cleared the aircraft to land: "Air Bagan 424 ,wind calm ,runway 21,clear to land, caution landing Runway wet, after landed vacate via Charlie". The aircraft was configured for landing, descending through the decision height the runway and runway lighting was visible in light rain. Descending through about 50 feet AGL the rain suddenly increased and the visibility became poor. The captain took control of the aircraft. A few seconds later the aircraft touched down hard and skidded left off the runway coming to a stop 2800 feet past the runway threshold and 75 feet left of the runway edge.

A passenger received a serious injury. The aircraft sustained substantial damage including left hand main gear and nose gear collapsed, right hand main gear's shock absorber fractured, fuselage skin deformed, wrinkled and torn, left hand propeller blades broken, passenger service unit panels fallen down.

The MAIB analysed:

The aircraft was fully configured with gears down and flaps consistent for landing with the auto-pilot coupled. The Yangon ILS approach for runway-21 was flown on autopilot until 215 feet radio height. The aircraft was crabbing to the right, i.e. the heading way around 217deg whereas the runway track was 214 deg. This might indicate a crosswind from the right side of the aircraft.

At 215 feet when the autopilot was disconnected, the aircraft drifted to the left and descended below the glide slope. The vertical speed during the initial part of the final approach was approximately 700 ft/ min descent rate. After the autopilot was disconnected the rate of descent increased from 700 ft/ min to more than 1000 ft/min. Two seconds prior to touchdown the vertical speed reached 1140 ft/min. The aircraft touched down with a pitch of -1.3 deg (pitch down) and a roll angle of 2.46 deg (right wing down). The aircraft then bounced and touched down the second time with a pitch angle of 1.23deg (pitch up) and a roll angle of -8.75deg (left wing down). During the bounce the aircraft drifted to the left on the runway center line. The aircraft continued down the runway with a negative roll angle, i.e. left wing down. The aircraft's lefthand main landing gear was substantially damaged however the point at which the landing gear was damaged could not be conclusively determined from the flight data.

Metars:
VYYY 241500Z 17004KT 5000 -RA BKN010 FEW015CB OVC090 24/24 Q1012 CB S
VYYY 241430Z 24005KT 4000 RA BKN010 FEW015CB OVC090 25/25 Q1012 CB S
VYYY 241400Z 23005KT 3000 RA BKN010 FEW015CB OVC090 25/25 Q1011 CB S
VYYY 241330Z 31003KT 4000 RA BKN012 FEW015CB OVC090 25/25 Q1011 CB S
VYYY 241300Z 17003KT 2000 +RA BKN010 FEW015CB OVC090 25/25 Q1011 CB S
VYYY 241230Z 32004KT 3000 RA BKN010 FEW015CB OVC080 25/25 Q1010 CB S
VYYY 241200Z 31005KT 6000 DZ BKN012 FEW015CB OVC090 26/25 Q1009 CB S
VYYY 241130Z 32002KT 6000 BKN012 FEW015CB OVC090 26/25 Q1009 CB S
VYYY 241100Z 25008KT 6000 BKN012 FEW015CB OVC090 28/25 Q1009 CB S
VYYY 241030Z 26008KT 6000 BKN012 FEW015CB OVC090 28/25 Q1009 CB S
VYYY 241000Z 24006KT 7000 DZ BKN015 FEW018CB OVC100 29/23 Q1009 CB S
VYYY 240930Z 23007KT 7000 DZ BKN015 FEW018CB OVC100 29/26 Q1009 CB S
VYYY 240900Z 24005KT 7000 DZ BKN015 FEW018CB OVC100 29/26 Q1009 CB S
Incident Facts

Date of incident
Jul 24, 2015

Classification
Accident

Airline
Air Bagan

Flight number
W9-424

Destination
Yangon, Myanmar

Aircraft Registration
XY-AIH

Aircraft Type
ATR ATR-72-200

ICAO Type Designator
AT72

Airport ICAO Code
VYYY

This article is published under license from Avherald.com. © of text by Avherald.com.
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