Page 18 - Volume 10 Number 11

it should be displaced to the left, away from the nose. On the other hand, the right side’s propeller tends to hurl any rock right into the nose, nose gear door, or other forward part of the plane.
Second, remain at Low Idle and conduct two battery starts without using a generator to recharge between the starts. Sure, this puts more drain on the battery, but it can handle it without problems. Yes, the second engine will not benefit from a generator assist, so the stabilized speed will be lower and the peak ITT will be higher ... but well within comfortable limits.
The reason we “must” forego the generator usage is that N1 versus generator load limits will be exceeded unless we go to High Idle on the left engine. Although the propeller-disturbed air at Low Idle will not guarantee no rock damage in all cases, High Idle will almost assure that there will be some rock damage ... if not to the nose, then to a propeller blade or blades. The difference in disturbed air factor between Low and High Idle is greater when the Low Idles are set close to 50 percent N1, as on the older three-blade-propeller airplanes. The difference is not as dramatic on four-blade-propeller airplanes since their Low Idles are set closer to 60 percent, yet all High Idles are near 70 percent.
How about starting in feather to keep RPM, wind, and noise down, so there is less dirt/gravel/sand displaced? There is absolutely no question that RPM and noise will be less. As for wind? Of course, the normal prop wash blowing back over the nacelle and wing is eliminated but how about the “wind” the ground feels as the blade makes that right-to-left pass? In most cases this will actually be greater in feather, the exception being the three-blade models with their low Low Idle speed.
I suggest not starting in feather on these surfaces until you conduct a simple test. In your own King Air,
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16 • KING AIR MAGAZINE
NOVEMBER 2016