AW139 Starting Issues
Ok guys, yes the GCU's need to be reset 98% of the time if you have -5 GCU installed. No mention of any fix yet so consider it SOP.
Common sense dictates to always have your generator on and charging before starting the second engine.
Install the 27 auxillary and 44 amp main if you have not already.
Ground Power Start when ever possible.
Our Standard trips run about 40 -45 minutes each way and that is not enought time to fully recharge the nicad batteries(Marathon says your need a min of 80 minutes to charge the 44 amp main) so to prevent starting issues we deep cycle both the 27 amp and 44 amp batteries every 4-6 months. I advise not letting it go longer. We have a spare set of rotatable batteries for our 3 machines and we have not had any starting issues for over 3 years now.
Occasionally the pilots must do battery starts in remote locations and the increased frequency of deep cycling more often has really improved the starts and keeps the pilots happy.