Figure D6.
Principal components of helicopter tripod
deployment/recovery system
The principal components of the deployment/recovery system consist of the
instrument tripod, a mooring line, an 11-in.-diam trawl float with 7 pounds
buoyancy, a 50-ft -buoyant recovery line with an 11-in.-diam trailing trawl float,
a grapnel, the helicopter winch and line, a reach pennant and a load limiter
system (Figure D7). During deployment the buoyant recovery line was attached
directly to the cargo hook on the HH-60J and flown to the deployment site. The
assembly was then lowered until slack appeared in the buoyant line, indicating
the tripod was in position on the sea bottom. The pilot then released the buoyant
line from the cargo hook. During recovery, the floating line was approached
perpendicularly with the grappling hook just below the water surface.
Continuing forward and upward the floating line was picked up by the grappling
hook, the trailing buoy providing a stop if required. The buoyant line was then
lifted to the helicopter using the helicopter's winch system (Figure D6), load
limiters and a reach pennant were attached to the end of the buoyant line
D10
Appendix D
Field Data Collection
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