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Hello Byron, it is the main fuselage tube. You can just measure straight behind the engine or just in front of the seats...?? the fuselage boom tube towards the back can have a very slight angle so I always measure between the front and the rear of the cabin on the bottom of the fuselage tube. I hope this helps

The operation and maintenance manual for my X-Air Standard simply says that weight and balance weighing must be done with the aircraft level.  It does not state what reference surface is used to establish whether or not the aircraft is level.  I am guessing that it is either the main structural tube or the cockpit floor.  They appear to be parallel so either one gives the same result.  Does anyone know of any official information as to what reference surface is to be used to establish level for these measurements?

Thanks.
Byron Jones

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