Flying Pig Posted October 17, 2003 Report Share Posted October 17, 2003 FYI.. I was pre flighting the bird a few days ago, and we found hair line cracks at the base of the tail rotor blades. At first we thought it was the paint cracking. A look under the magnifying glass showed both blades were developing hair line cracks in the actual blade itself. Quote Link to comment Share on other sites More sharing options...
flingwing206 Posted October 17, 2003 Report Share Posted October 17, 2003 Hi FP, If the tail rotor was aligned one blade up and one blade down and you sighted down along the trailing edge of the pitch-horn/tt casting where the rotor blade joins, is the crack there? section view (looking down from rotor hub) leading edge--> ( )|==== ---- ^ crack Quote Link to comment Share on other sites More sharing options...
UNDCFII Posted October 17, 2003 Report Share Posted October 17, 2003 There is a SB out there that we accomplish on each preflight that requires looking for spider cracks under each of the T/R blade attach bolts of the H300C's. Don't have the specific number in the office but Schweizer can fill you in. Quote Link to comment Share on other sites More sharing options...
Flying Pig Posted October 18, 2003 Author Report Share Posted October 18, 2003 Flying Wing... Defintiely easier to show than to explain!!! I believe you are right. It is where the blades join the center of the hub, where they flatten out from the center. Quote Link to comment Share on other sites More sharing options...
JDChopperpilot Posted October 18, 2003 Report Share Posted October 18, 2003 does this affect the 300cb as well or is it limited to the 300c and eairler models? No matter, I will take a much closer look at the 300cb I fly. Quote Link to comment Share on other sites More sharing options...
flingwing206 Posted October 18, 2003 Report Share Posted October 18, 2003 Defintiely easier to show than to explain!!! It is where the blades join the center of the hub, where they flatten out from the center.OK so, first let me stress that what I offer is only anicdotal advice and you should OF COURSE follow all the good direction from your A&P and the manufacturer! A few of our CBs, hours ranging 1,500~4,000 TT, have developed what I will call a "non-structural" crack where the inner end of the TR blade itself fairs into the trailing half of the TT/feathering arbor. (The arbor is also where the aforementioned spider cracks can develop) Anyway, that narrow triangle-shaped bit is not structural, so it is not a disaster to develop crack at the joining arc. As long as there is no crack or separation along the long edges where this piece meets the root/trailing end of the blade, there should be no issue. Again, please be sure you get an A&P with Schweizer experience to inspect the blades - I'm only offering a little info. Quote Link to comment Share on other sites More sharing options...
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