The crew of an aeroplane are performing a turning departure. In this type of departure, straight flight is assumed until reaching a height of at least…
ICAO Doc 8168
2.3 TURNING DEPARTURES
2.3.1 When a departure route requires a turn of more than 15°, it is called a turning departure. Straight flight is assumed until reaching an altitude/height of at least 120 m (394 ft), or 90 m (295 ft) for helicopters. Procedures normally cater for turns at a point 600 m from the beginning of the runway. However, in some cases turns may not be initiated before the DER (or a specified point), and this information will be noted on the departure chart.
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