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91 said:Occasionally, when you see a Dash taxing around with an engine feathered, it could be because the engine ECU is inop. With the ECU working normally, it keeps the prop out of the prohibited range (500-780 prpm if I recall correctly), without the ECU, the unfeathered prop will run rightin the middle of that range unless you push the power lever up a fair bit (too much thrust to taxi around with). So you must run it in feather until you're ready to push it up for takeoff, and then feather it again clearing the runway. At ALG, we could dispatch like this (with one engine ECU inop), but not if the runways had ANY contamination, or any surface had any FROZEN contamination (again, if I remember correctly) because you'd essentially be taxiing around single engine. In five years, I think I only saw 2 or 3 inop ECU's, and it was kind of a hassle, but more so inflight, especially on approach, because the power levers would end up being split quite a bit, and each engine would respond to power lever movements differently, so the approach was very often a little crooked (but not enough to notice unless you were actually flying).
Other times, it's just common practice to save a little fuel. The fuel flow difference is negligable in my opinion.
91 said:Other times, it's just common practice to save a little fuel. The fuel flow difference is negligable in my opinion.