Huey "bounce"
Has anyone out there had a bad vertical bounce develop very quickly with an external load in a UH-1H? Happened to me today. Came on in turns only and developed very quickly into a resonance that feels like the airframe is about to tear herself apart. Corrective action seems to be lowering the collective and then flying straight and level. Obviously this isn't ideal as a turn is usually required at some stage??!!
Last straw was when on a very shallow approach to the landing site with 1.6T load on a 30 foot line, as I started to ease in collective at about 150 feet the "bounce" started again and was off the scale in a few seconds. Which left me with an interesting decision..... Lower collective to get out of the "bounce", ( and spud in) or raise collective and make the resonance worse!??!! I did the later by the way and rode out a horrendous resonance til load was clear of everyone and buttoned.
This problem doesn't happen with a 1.5T internal load, but external is a b--tch!
Any feedback from anyone who knows the ole Huey appreciated....