Coastal Posted January 5, 2010 Report Share Posted January 5, 2010 Hi all, well here's something that came up a while ago and I don't think I've ever gotten a straight answer. We all know what LTE is, or at least we all SHOULD know. Based on the highly circulated FAA circular 90-95, there are three separate, overlapping zones of relative wind azimuth, from 120 to 330 degrees, that may contribute to LTE (along with all the other factors: high gross weight, low airspeed, pilot inattention etc). This is essentially the entire LEFT side of the aircraft. Conversely, Performance Sections of Bell Flight Manuals for the 206 series discuss the "Critical Relative Wind Azimuth Area" and from my understanding, the aircraft will have decreased hovering performance due to "tail-rotor control margin and/or control of engine parameters". This area covers nearly the entire RIGHT side of the aircraft (from 050 to 210 relative to the nose of the a/c). Most pilots I've asked said that, if required, they would rather accept a right crosswind than a left crosswind (in a Bell or other counterclockwise rotor system) and reference the above FAA circular and LTE as the reason why. My question is how does LTE and relative winds from the left side of the aircraft fit into your interpretation of the Bell Hover Ceiling Charts. Which of the two crosswinds is the lesser evil, from the left or from the right? For what reason(s) does Bell show right crosswinds as detrimental to tailrotor control, and not left crosswinds? Obviously into wind is the best choice, but we all know there are situations where we'll have to accept a crosswind in conditions that may lead to LTE. It seems to me that the information in Bell's Flight Manuals and the information available from the FAA on LTE is conflicting and does not leave the pilot with clear information on a potentially dangerous flight condition. What do you guys/gals think? Coastal Quote Link to comment Share on other sites More sharing options...
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