In this video, SR3 instructors demonstrate the proper use of a tagline during a litter extraction. This is a very effective means to prevent spin, particularly in confined areas.
The tagline attendant is positioned on the ground far enough away to create a proper angle, allowing for control of the litter. Angle is critical – if the line is directly below the litter it becomes ineffective, allowing spin to occur. The crew uses great communication to verify the tagline has been released, to prevent a departure with it still attached.
A briefing is also conducted in advance to identify what action will be taken if the tagline weak link breaks, or a spin develops for any reason. In this case, forward flight at a speed of approximately 30 knots as soon as it is safe to do so.
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Helicopter hoist, Training