General Aviation

Published on May 2nd, 2021 | by Mark Dwyer


Tellus Survey to Restart this Month

The now-familiar de Havilland Twin Otter (C-GSGF) operated by specialist survey company, Sander Geophysics Ltd, will restart survey work over Counties Laois, Kilkenny, Tipperary and Waterford, and neighbouring parts of Kildare, Carlow, Offaly and Cork (see map below). The current phase of the Tellus survey is recommencing in early May, following a planned break, and is expected to conclude in late summer/early autumn 2021. For up to date information and the planned weekly flight schedule, please visit

The aircraft will fly at around 200ft over rural areas rising to 800ft over urban areas. General Aviation pilots should be aware of the possibility of encountering this aircraft, especially during the takeoff and landing phases. There are multiple private airstrips in the survey area, many of which are not on the Aeronautical chart and as a result will not be known to the survey pilots. The Twin Otter will be operating at about 115 knots, which may make it difficult to spot from the ground. To get further information about the precise daily movements of the survey aircraft, you can contact the Tellus team by Freephone 1800 45 55 65, Email Twitter @TellusGSI and

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About the Author

Mark is an airline pilot flying the Boeing 737 for a major European airline. In addition he is also a Type Rating Instructor, Type Rating Examiner and Base Training Captain on the B737. Outside of commercial flying Mark enjoys flying light aircraft from the smallest 3 Axis microlights up to heavier singles. He is also an instructor and EASA Examiner on single engines and a UK CAA Examiner. He flies the Chipmunk for the Irish Historic Flight Foundation (IHFF). Mark became the Chairman of the National Microlight Association of Ireland (NMAI) in 2013 and has overseen a massive growth in the organisation. In this role he has worked at local and national levels. In 2015, Mark won ‘Upcoming Aviation Professional Award’ at the Aviation Industry Awards sponsored by the IAA. Mark launched this website back in 2002 while always managing the website, he has also been Editor and Deputy Editor of FlyingInIreland Magazine from 2005 to 2015.

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