elevación o eslinga
https://media.defense.gov/2017/Mar/29/2001723706/-1/-1/0/CIM_13482_2B.PDF
https://vitatech.co/blog/the-literal-impact-of-helicopter-sling-load-operations/
https://helipoland.com/en/loty-specjalistyczne/loty-z-podwieszonym-ladunkiem-heslo/
https://www.frontierhelicopters.com.au/services/sling-load-operations.html
https://publicapps.caa.co.uk/docs/33/CAP426.PDF
https://training.gov.au/TrainingComponentFiles/AVI08/AVIY4054A_R1.pdf
https://www.heliservice.de/en/offshore-transport/helicopter-hoist-operation/
https://vitatech.co/blog/the-literal-impact-of-helicopter-sling-load-operations/
https://helipoland.com/en/loty-specjalistyczne/loty-z-podwieszonym-ladunkiem-heslo/
https://www.frontierhelicopters.com.au/services/sling-load-operations.html
https://publicapps.caa.co.uk/docs/33/CAP426.PDF
https://training.gov.au/TrainingComponentFiles/AVI08/AVIY4054A_R1.pdf
https://www.heliservice.de/en/offshore-transport/helicopter-hoist-operation/