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发表于 2011-12-20 22:47:54
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Capt W is absolutely correct:"QNE is the reading in feet on an altimeter with the sub-scale set to 1013.2 mb when the aircraft is at aerodrome or touchdown elevation"You are right in that the altimeter will not give airfield elevation, but in this case that is not what is required - it will give the airfield's pressure altitude or QNE (pressure altitude is the height above the 1013.2mb level - and airfield pressure altitude rather than altitude amsl is the definition of QNE).
QNE is the "odd man out" amongst these "Q" codes in that it is measured in distance units rather than pressure units. It is a common mistake to confuse QNE with the standard pressure setting of 1013.2mbs / 29.92"Hg. The latter is a sub-scale setting, the former is an altimeter reading on the airfield with standard (rather than QNH or QFE) set.
I've still got an old copy taken from a 1955 Manual of Air Traffic Services with a comprehensive list of the old "Q" codes. They had fun in the days of w/t - if you sent "QRL" it meant "I am busy - please do not interfere". How things change..........
[PS: The UK has a filed difference to use millibars in place of hectopascals - a bit of a waste of breath as the two units are identical] |
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