Figure 2-31. Bay Ground Recovery (Sheet 4 of 4).
Recovery by Helicopter.
Retrieval by helicopter consists of four phases: (1) closing bay, (2) lifting bay (3) ground-
ing bay (at recovery site), (4) loading bay onto transporter.
In order to provide a fixed reference point for the helicopter
pilot, the bay must first be held in a fixed position against the shore or some other stable object. Use of a bridge erection
boat for stabilization is not feasible due to rotor wash induced drifting. Once the bay is held in place, it must first be closed
by a single point lift at the lifting eye. After the bay is closed it can be lifted for transport by using the airlift sling and four-point
suspension. The airlift sling and shackles provided in the supplemental set are to be used to provide four-point suspen-
sion. When suspended by the sling, the ramp bay can be transported at airspeed of up to 100 knots. In order to transport
the interior bay at air speeds above 40 knots, a drogue parachute, (NSN 1670-00-052-1548), 15 foot diameter ribbon
bridge type with a 60 foot extraction line and 3 foot adapter are required to provide stability. Safe airlift speed is determined
by wind speed and direction, type and condition of aircraft as well as pilot proficiency in hauling the bridge. The helicopter
will transport the bay to the recovery site where it will be loaded onto a transporter.