Originally Posted by
ghostfish1
It’s been some time since I’ve flown the AW139 but I’m pretty sure that when the ECL is moved using the collective Beep Trim while the engine switch (also located on the collective) is in AUTO Mode, the engine will not respond. The ECL will cycle forward and aft but the engine remains controlled by the EEC. There was a maintenance procedure I conducted a couple of years back where by after performing a normal engine start, the ECL was beeped back to minimum. The engine was unaffected until the engine switch was switched from AUTO to MANUAL where it then decelerated to a specific value. We were checking that the engine did indeed decel to a specified value without flaming out. I believe it was a rigging check.
You are correct, as long the engine is AUTO GOV you can move the ECL nothing happen on the engine power.
At reversion from AUTO to Manual, the power should not change more than 10% from its datum.