Ring Gear: Great post and educational/maintenance information re some new equipment that must be a huge help in use.
One comment re whirl towers, at least as promulgated within SA during my tour of duty: the purpose of the whirl tower was to be able to replace a blade in the field, adjust the push rod length as indicated, and expect that its 1P ( i.e., track and balance characteristics ) to be flyable safely. Not that the 1P levels would meet the Maintenance test flight criteria ( which were the same criteria used for production acceptance of new aircraft ), but that would allow safe flight with perhaps elevated 1P levels and safe until you could get it to a maintenance facility with the vibration gear, and make the necessary adjustments to get the blade within the MTF ( maintenance test flight manual ) limits.
Last edited by JohnDixson; 14th Aug 2020 at 21:27.
Reason: add addressee