TM 1-1520-240-106-6-216-6-47. Securing Cargo.The helicopter is subjected to forces which result from airturbulence, acceleration, rough or crash landings, andaerial maneuvers. These same forces act upon the cargoin the helicopter and tend to shift the cargo unless it isfirmly secure. Forward motion of the helicopter is themost rapid movement that will be encountered and is thestrongest force that is likely to act on the cargo if thehelicopter is suddenly slowed or stopped in a crash lan-ding. Other forces tending to shift the cargo aft, laterally,or vertically will be less severe. The amount of restraintrequired to keep the cargo from moving in any directionis called the restraint criterion and is expressed in unitsof the force of gravity, or g’s. In each case, the maximumforce exerted by the item of cargo to be restrained wouldbe its normal weight times the number of g’s of the re-straint criteria. In order to safely carry cargo, the amountof restraint applied should equal or exceed the maximumamount of restraint required. Restraint is referred to bythe direction in which it keeps the cargo from moving.Forward restraint keeps the cargo from moving forward,aft restraint keeps the cargo from moving aft, and so on.
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