Track Line Search (TS)

	Normally used when an aircraft or vessel has disappeared without a trace along a known route.
	Often used as initial search effort due to ease of planning and implementation.
	Consists of a rapid and reasonably thorough search along intended route of the distressed craft.
	Search may be along one side of the track line and return in the opposite direction on the other side (TSR).
	Search may be along the intended track and once on each side, then search facility continues on its way and does not return (TSN).
	Aircraft are frequently used for TS due to their high speed.
	Aircraft search height usually 300 m to 600 m (1000 ft to 3000 ft) during daylight or 600 m to 900 m (2000 ft to 3000 ft) at night.