A332/B738, vicinity Amsterdam Netherlands, 2012

A332/B738, vicinity Amsterdam Netherlands, 2012

Summary

On 13 November 2012, a Garuda Airbus A330 and a KLM Boeing 737 lost separation against each other whilst correctly following radar vectors to parallel approaches at Amsterdam but there was no actual risk of collision as each aircraft had the other in sight and no TCAS RA occurred. The Investigation found that one of the controllers involved had used permitted discretion to override normal procedures during a short period of quiet traffic but had failed to restore normal procedures when it became necessary to do so, thus creating the conflict and the ANSP was recommended to review their procedures.

Description

On 13 November an Airbus A330-200 being operated by Garuda on a scheduled passenger flight from Dubai to Amsterdam and a Boeing 737-800 being operated by KLM on a scheduled passenger flight from Manchester to Amsterdam were being radar vectored to Instrument Landing System (ILS) approaches to runways 18C and 18R respectively in day Visual Meteorological Conditions (VMC) when the prescribed traffic separation was lost. ATC gave corrective headings and the two aircraft then continued their ILS approaches as planned. There were no abrupt manoeuvres and no TCAS RAs during deconfliction.

Investigation

An Investigation was carried out by the Dutch TSB using radar and R/T recordings. It was noted that the former had a refresh interval or time lag of 5 seconds.

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