Lionair B739 at Pekanbaru on Feb 15th 2011, overran runway on landing
Last Update: July 22, 2013 / 15:49:57 GMT/Zulu time
Incident Facts
Date of incident
Feb 15, 2011
Classification
Incident
Airline
Lion Air
Aircraft Type
Boeing 737-900
ICAO Type Designator
B739
The aircraft did not decelerate according to the preselected value of –0.435 G from the beginning touch down until the aircraft stop due to the decreasing of the calculated airplane braking coefficient that might caused by low skid resistance, rubber deposit and wet runway.
The existing weight, temperature and additional factor of 17 knots tail wind component, with assumption of runway braking action medium would require landing distance longer than the available runway.
The NTSC reported that the aircraft approached runway 36 with flaps set to 40 degrees and a Vref of 136 knots. At touch down the aircraft experienced 8 knots tail wind in addition to being 17 knots above target speed Vref. Computations showed the stopping distance in these circumstances would be 7510 feet with the runway length available being 7350 feet in addition to slippery runway with patches of water and deposits of rubber. Consequently the aircraft overran the end of the runway and came to a stop past the runway end safety area on soft ground.
The NTSC basically repeated the analysis of the runway overrun the day before, see Incident: Lionair B739 at Pekanbaru on Feb 14th 2011, runway excursion on landing, but added that due to being 17 knots above Vref the required distance to stop the aircraft exceeded the landing distance available regardless of the degradated braking action available from the runway.
Following the two overruns within two days an emergency meeting was held in May 2011 where the schedule of rubber deposit removal at the airport was modified, the runway coefficients were downgraded from 0.6 to 0.55 and the aircraft agreed to warn "runway slippery when wet" and to do repairs of the runway to eliminate water patches.
Incident Facts
Date of incident
Feb 15, 2011
Classification
Incident
Airline
Lion Air
Aircraft Type
Boeing 737-900
ICAO Type Designator
B739
This article is published under license from Avherald.com. © of text by Avherald.com.
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