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Position of the static port is critical. We had erroneous IAS when

compared to a calibrated system using a static drogue. It transpired

that the static position had been determined by LOOKING at the manual

rather than measuring. It was only out by a couple of inches but

repositioning as per manual completely corrected the IAS.

The cockpit pressure is definately lower than ambient and an alternate

cockpit staic source will give an apparent increase of 20Kts and an

altitude gain of 200ft (good for showing how fast Your plane goes)!



Cheers



David Byrnes