Pilot confusion caused Monarch runway incursion at Dublin, says AAIU

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A Monarch Airlines Airbus A321 (G-OZBS) and a Ryanair Boeing 737-800 (EI-DPT) came within 360m (1,180ft) of a collision on a runway at Dublin airport, according to the Irish Air Accident Investigation Unit final report on the 21 May 2011 incident.

While the Vilnius-bound Ryanair 737 was carrying out a cleared take-off on runway 16 at Dublin, the late-running Monarch A321, operating as flight MON7562 to Tenerife, "mistakenly taxied onto the latter part of the same runway", says the AAIU, as it moved towards the longer runway 28.

The 737-800 had almost reached take-off decision speed (V1), but "it immediately conducted a high-speed rejected take-off and stopped approximately 360m from the A321". There was no damage or injury during the rapid deceleration from a maximum recorded ground speed of 118kt (220km/h), with an indicated air speed of 134kt, says the report.

The flight crew of the Monarch jet blamed poor taxiway markings and confusion over their location for the runway incursion, says the report. In addition a "period of high workload" generated by a late departure may have contributed to the incident, it says.

The AAIU notes that since then Dublin airport has installed and put into operation a level 2 advanced surface movement guidance and control system (ASMGCS), as a planned upgrade to its air traffic management on the ground.

In addition, says the report, an associated runway incursion monitoring and conflict alert system and stop bar violation monitoring system, which generates an audible and visual warning when an aircraft passes a lit stop bar, were implemented at Dublin to help ATC prevent a similar occurrence.

The report says: "Additional procedures and a new runway incursion hot spot were also designated and published by the Irish Aviation Authority."

Simultaneous use of runways 16 and 28 is no longer allowed, it adds. Dublin Airport and the Irish Aviation Authority will also review the taxiway designation at Dublin in order to simplify taxi instructions, it says.