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@Wk taylor, your analysis were spot on, loved to stay in contact with you on technical analysis. Hope you share your email ID with me. Then i can share further details of aerial vehicle

Hello, iam back. Actually i was away from internet and trying to spend internet free month. We have got the analysis report of coupling. It failed due to loss of grease from packing which gradually resulted into overheating and material deterioration. So, the point is we have introduced...

Thanks for the guidance. Questions which i asked in the start was very basic one as we were at the start of finding root cause. Visual inspection tool was adopted to find cause of failure. Aparently, we reached to a conclusion that gasket between coupling torn out which lead ro dryness of grease...

Yes iam here

@3ddave. To identify the root cause which lead to failure of tail rotor drive shaft faipure. What is your views about this coupling condition

Exactly, the same way we are doing investigation to identify, the first point of failure which lead to sequence of events. This coupling appears to us faulty due presence of fretting wear of teeths in a specific pattern and corrosion . Obviously this doesnot happened at the time of impact with...

Sir, helo was in hover taxi and took off 3 minutes ago. When suddenly, tail rotor stopped and it went into spin and crashed on ground. Main rotor blades also came into comtact with tail drive shaft. So exactly it is unknown after looking drive shaft that what was the initial damage which...

This coupling condition is freshly removed. Iam trying to workout that is it due to loss of lubrication or due to impact. This side is connected to the main drive shaft through this coupling and on its right is tail drive shaft of helicopter. Periodically it is greased once a year and then...

This is the other end. Here you can see teeths of coupling are damaged/wear in a specific regular pattern. Only area of approx 5mm is damaged in this coupling and on the other end splines teeths are of 5mm approx length. This drive shaft has allowed play of 5mm in axial direction

Hello, iam analysing failure of coupling shaft. Iam exactly not able to make out whether it is a failure due to overheating, loss of lubricant or when my tail rotor hit the ground resultantly its impact load caused it. However, i didnot think it is due to sudden impact load. One more thing if...