AW139 Nf (NR) control issue
We operate two AW139 and I think one of them has a Nf (NR) control issue.
When it was picked to hover by a trainee with NR set to 102%, ROTOR HIGH came out and NR indication showed 104%.
I didn't think the control by my trainee wasn't bad though it was not exactly the same as the one by a pilot who has type rating.
And when we did RTO training by using TRNG MODE, when a trainee set CLTV down to recover NR right after activating TRNG MODE,
NF (NR) going up rapidly and NR HIGH came out. The control was not that fast, I think.
If somebody knows the same issue and knows how to troubleshooting, pls comment on it.