AT75 / B739, Medan Indonesia, 2017

AT75 / B739, Medan Indonesia, 2017

Summary

On 3 August 2017, a Boeing 737-900ER landing at Medan was in wing-to-wing collision as it touched down with an ATR 72-500 which had entered the same runway to depart at an intermediate point. Substantial damage was caused but both aircraft could be taxied clear. The Investigation concluded that the ATR 72 had entered the runway at an opposite direction without clearance after its incomplete readback had gone unchallenged by ATC. Controllers appeared not to have realised that a collision had occurred despite warnings of runway debris and the runway was not closed until other aircraft also reported debris.

Description

On 3 August 2017, a Boeing 737-900ER (PK-LJZ) being operated by Lion Air on a scheduled domestic passenger flight from Banda Aceh to Medan as JT197 touched down on runway 23 at destination in normal day visibility, and shortly after, collided with an ATR 72-500 being operated by Wings Airlines on a scheduled domestic passenger flight from Medan to Meulaboh as IW1252. Both aircraft sustained substantial damage but none of the 223 occupants were injured and both aircraft were taxied clear of the runway. ATC were advised of resultant debris on the runway but allowed the runway to remain in use until other aircraft subsequently using it had also reported the presence of debris after which it was closed.

Investigation

An Investigation was carried out by the Indonesian National Transportation Safety Committee (NTSC) - the Komite Nasional Keselamatan Transportasi (KNKT). Data from the FDR and 2 hour CVRs of both aircraft were successfully downloaded and used to support the Investigation. ATC recorded data including from the TWR cab CCTV were also available.

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