text: Chapter 5
  UNIT RESPONSIBILITIES
  5-6. Most slingload operations involve four units. Each has pathfinders who perform specific
  functions.
  SUPPORTED UNIT
  5-7. The supported unit moves equipment and rigs the loads. Pathfinders in the supported unit check
  the weight, rigging, and positioning of all external loads to ensure helicopter safety. Ideally, the supported
  unit provides hookup personnel for individual loads. In the supported unit, pathfinders assist in—
  y Selecting, preparing, and controlling the PZ.
  y Coordinating in advance with the supporting unit.
  y Rigging the loads.
  y Furnishing slings, straps, clevises, and any other slingload equipment required for the move.
  y Checking for improper rigging and weight in excess of the aircraft's ACL.
  AVIATION UNIT
  5-8. This is the aviation unit that will fly the loads. They—
  y Provide advice and technical help to the supported unit, as required.
  y Ensure that the loads fall within the transporting aircraft's ACL.
  y Provide assistance in the recovery and return of slingload equipment.
  y Advise the supported unit on load limitations.
  y Advise the supported and receiving units on the suitability of selected LZs and PZs.
  y Establish coordination with the supported and receiving units.
  RECEIVING UNIT
  5-9. The receiving unit—
  y Selects, prepares, and controls the LZ.
  y Provides trained ground crews to guide the aircraft and de-rig the loads.
  y Coordinates with the supporting unit for the control and return of the slingload equipment.
  y Inspects the rigging of back loads.
  PATHFINDER UNIT
  5-10. In the pathfinder unit, pathfinders—
  y Provide advice and aid to the supported, aviation, and receiving units.
  y Provide expertise in the planning and execution of both PZ and HLZ operations.
  y Supervise the rigging and inspection of all the loads.
  y Provide ground guidance and air traffic control during the slingload.
  y Ensure that the loads fall under the transporting aircraft's ACL.
  EQUIPMENT
  5-11. Cargo nets and slings make up an essential part of the external load operation. During an
  inspection, they require the same level of attention that the cargo receives. Any evidence of frayed or cut
  webbing justifies replacement of the affected component. When they assemble slings, pathfinders should
  avoid sewing up torn slings or substituting nonstandard parts in the field. Slings must meet the critical