FDR: comment not relevant to the accident ( I’m sure ) but relevant to the numbers you posted, except for the turn part. In doing flight load survey data gathering, the flight test cards at SA always add in a maneuver called a rough approach. The pilot has to find it for that particular days wind and the weight/speed. Typically 15-30Kts and 800-1500 fpm descent. Mechanism is the advancing rotor entering the tip vortex from the preceding blade. One can sit in it and it will definitely rattle the ship at the N/rev frequency. It can produce vibratory stresses that can enter into the fatigue life calculations for things like engine mounts to top deck items. Aircraft that sit in this regime a lot, like S-64 logging for instance, have seen the resultant need for structure beef-up. Ok, just background-not applicable to subject at hand.
Last edited by JohnDixson; 29th Apr 2022 at 13:54.
Reason: Typo: fpm not rpm