Originally Posted by
hyperflyboy
wrench
Thanks for the info.
A local AME told me it could be something with the FCU adjustment. Does that make sense? Its got about 450 hours before timex.
I've never noticed smoke on shutdown or startup.
Hyper
I'm just a pilot , but....
If it is a leak in the lab seal you need to be mindful of coking and N2 lockup. Carbon on the turbine blades accumulates in the outer edge near the scatter shield and can contribute to wheel cracking. Also If you start getting N2 lockup its time to pull the turbine. On a 500 the rotors should be turning around 12-13% N1, before fuel is introduced. If it isn't, starts put way more stress on the #3 and #4 wheels (because they are stationary for the first few seconds in the flame path) and can eventually lead to failure. I've seen black smoke on 530s with C30s but never any smoke on a 500 with a C20.
Are you running HTS oil?