I work for a UK operator who is just starting its first winter of operations into Scandinavia, so this thread has really caught my attention.
My understanding of Airfield QNH is that an ISA calibrated altimeter at the Airfield is set to read Airfield elevation. The subscale pressure setting is the Airfield QNH that is passed to the Pilot. The QNH therefore must be corrected for temperature. Any further altimeter correction for temperature to approach minima should be calculated from height above the runway threshold only.
If this topic ran last year, can anybody recall the conclusions reached?
[This message has been edited by Squawkbox (edited 28 November 1999).]