B733, Yogyakarta Indonesia, 2011

B733, Yogyakarta Indonesia, 2011

Summary

On 20 December 2011, the experienced Captain of a Sriwijaya Air Boeing 737-300 flew an unstabilised non-precision approach to a touchdown at Yogyakarta at excessive speed whilst accompanied by a very inexperienced First Officer. The aircraft overran the end of the 2200 metre-long wet runway by 75 metres . During the approach, the Captain 'noticed' several GPWS PULL UP Warnings but no action was taken. The Investigation attributed the accident entirely to the actions of the flight crew and found that there had been no alert calls from the First Officer in respect of the way the approach was flown.

Description

On 20 December 2011, a Boeing 737-300 (PK-CKM) being operated by Indonesian carrier Sriwijaya Air on a scheduled domestic passenger flight from Jakarta to Yogyakarta as SJ230 diverted to Surabaya because of poor weather and subsequently, after refuelling, flew from Surabaya to Yogyakarta. Since the Instrument Landing System (ILS) was promulgated out of service by Notice To Airmen, a non-precision approach was flown in daylight to a visual transition. However, this was followed by a bounced touchdown at excessive speed on the wet runway and the aircraft ran off the end at a significant speed before coming to a stop over 80 metres beyond the paved surface. The landing gear partially collapsed and an emergency evacuation was carried out during which 6 of the 137 occupants sustained minor injuries. Some runway lighting and signage was damaged by aircraft impact.

The final position of the aircraft and associated track marks (reproduced from the Official Report)

Investigation

An Investigation was carried out by the Indonesian KNKT (NTSC). The SSFDR and SSCVR were both recovered from the accident site and the data used in the Investigation.

It was found that the 58 year old Captain had 29,801 hours flying time; the amount of this in the 737 was not stated. The 28 year old First Officer had 562 hours total flying time; again the amount of this on the 737 was not stated.

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