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WHUBBS
Member
Last Activity: Today, 04:43 PM
Joined: 01-23-2005
Location: smithville tn.
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  • WHUBBS
    replied to Teeth gear ring cracks
    Yes you have another good point on bolt metallurgy, hardware store bolts are not certified to meet aircraft quality bolt standards and I would never use these bolts in my aircraft, Aircraft Spruce has certified hardware of all types and for the most part will have the manufacturer brand stamped on the...
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  • WHUBBS
    replied to Teeth gear ring cracks
    Yes it is also possible the steel is not proper for heat treatment, Three things are possibly going on that are not correct, improper steel type, not heat treated or improper temp.. also the gear that is chipping at the bottom of the tooth is so hard it is brittle and as the bendix gear strikes the...
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  • WHUBBS
    replied to Teeth gear ring cracks
    To me it appears the large ring gear has not been heated treated, in fact it appears it was not heat treated at all, no way would a gear tooth mush out of shape that much with only two or three prerotation cycles if it were heat treated.
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  • A ring gear is a separate piece just attached with a press fit, it is possible a severe jolt or shock could separate its mount. Is that not one rotor blade laying on the ground by the wreckage, which appears it is not even bent. So the other blade separated in flight some distance away which would...
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