CH-53 helicopters with underslung loads have been lost as a result of pilot coupling with the elastic modes of the aircraft.[1] The CH-53 has exhibited non-rigid body modes resulting in PIO generated by the underslung loads.[1]
Sources
- [1] NATO, Ed., Flight Vehicle Integration Panel Workshop on Pilot Induced Oscillations: = (Atelier sur le Pompage Piloté). in AGARD advisory report, no. 335. Neuilly-sur-Seine: AGARD, 1995.