Jet B Posted March 16, 2008 Report Share Posted March 16, 2008 I just want to pick the brain of some of you guys with alot of 407 experience. Myself and the other guys at this company are fairly new to the 407 and we are moving drills with it. Two very odd things it does intermittently are: 1. A fairly strong vertical hop comes in the hover sometimes. The machine was tracked in very cold weather and the hop is only noticeable when the weather warms up. Is it typical for this rotor system to get so rough with a 30 degree outside temperature change? 2. Every once in a while the machine will set into a quite noisy shuddering vibration in the hover. It's hard to describe it, but you don't feel it in any of the controls, just through the fuselage. This vibration goes away if you reduce power a bunch or if you get airspeed. We are doing everything we can to try and track down the cause of these two problems and thinking maybe it's being caused by the tranny mounting system? Our engineer is crawling all over the thing and can't find anything wrong and he is calling Bell tomorrow to talk to them about it. I just know alot of you guys have been working 407's a long time and figured it was worth a shot to see if anyone recognizes the symptoms. Any insight would be greatly appreciatd, thanks. Quote Link to comment Share on other sites More sharing options...
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