CRJX / AT75, Tambolaka Indonesia, 2018

CRJX / AT75, Tambolaka Indonesia, 2018

Summary

On 11 May 2018, a Bombardier CRJ1000 climbing on departure from Tambolaka and an ATR72-500 descending inbound there lost safe separation when during opposite turns in visual flight in uncontrolled airspace. Prompt response to both coordinated TCAS RAs resolved the conflict. The Investigation found the departing flight Captain mixed up left and right downwind circuit joining by the ATR 72 and that his inexperienced First Officer had not picked this up. It also noted that this Captain may not have been fit for duty and that all parties may have failed to fully recognise the limitations of ANSP ‘information’ service.

Description

On 11 May 2018, a Bombardier CRJ1000 (PK-GRJ) being operated by Garuda Indonesia on a scheduled domestic passenger flight from Tambolaka to Kupang as GIA460 and an ATR72-500 (PK-WFW) being operated by Wings Air on a scheduled domestic passenger flight from El Tari to Tambolaka as WON1921 lost safe separation in day VMC within Class ‘G’ airspace in which only Flight Information Service was provided. A coordinated TCAS RA resulted and was followed by both aircraft and the conflict was thereby avoided. The minimum vertical separation was 428 feet when 1.3 nm apart laterally.

Investigation

An Investigation was carried out by the Indonesian National Transportation Safety Committee (NTSC) - the Komite Nasional Keselamatan Transportasi (KNKT). Relevant CVR data were overwritten but both aircraft operators provided QAR data covering the event and a full recording of air traffic communications between the two aircraft and the Tambolaka Aeronautical Communications Officer (ACO) was available.

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