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#1
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Hi Herb,
I have made this comment before somewhere in an earlier post. When I first purchased my G model, I had the boom bounce on a fairly regular basis. Getting the cable tensions to spec seems to have solved the problem for me. Have never had it again. (Tomorrow, I'll have it, thanks! ;o) ) Anyway, I would tend to agree with last post as well. I would think that anything that can allow elevator movement beyond what is commanded by the pilot, would cause the issue. I did have my trim tab hardware replaced last annual because it seemed to me it had excessive play. I was not experiencing any problem but my IA agreed the play was too much. I cannot recall at the moment what was all replaced but my records would tell the story. Anyway, I would agree that anything that keeps flight controls in spec would go a long way to getting factory intended flying qualities. It would seem to me that flight controls out of spec in any manner could cause the aerodynamic gremlins such as the boom bounce many of us have experienced. Ed 
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#3
08-24-11, 11:56 PM
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Herb,
I apologize but unfortunately I do not have much for you to go on. I checked both the work order and log books and both entries say the same thing. "Trim actuator hardware loose. Secured all trim actuator hardware." Total labor 0.3 hours. The records indicate that nothing was replaced but simply secured. Sorry, I wish I could be more helpful. Ed
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#4
08-26-11, 10:44 PM
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No worries Ed
I looked into some parts and they are expensive. I will try to rebuild without having to buy new if possible.
__________________
Herb R Harney 1968 337C Flying the same Skymaster for 47 years
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#5
09-06-11, 08:32 AM
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The service manual may be helplul, e.g. the 1965 THRU 1973 SERVICE MANUAL Sect. 8-3 ELEVATOR - TROUBLE SHOOTING table pg. 8-3 has two suggestions to address "SLIGHT UNDULATION OF TAIL DURING FLIGHT".
__________________
Paul T337C
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#6
09-06-11, 08:48 PM
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I solved my boom bounce by adding a bit more torque to the elevator hinge bolts. I had to go beyond the recommended value. My IA didn't want the compression on the bearings but in the end the smooth stable flight characteristics were persuasive. Check for even the slightest play and eliminate it. If you can't find anything try a bit more torque on those hinge bolts a bit at a time.
Best of luck _travis
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