Sun Dec 11, 2005 3:51 pm
#256309
Doing the checks before flying yesterday the alitmeter was reading just over 1000' before I set it to zero ready to go (Pembrey's only 15' elevation). I thought it passing odd as I usually only have to tweak it hundred foot or so, even when it's the first flight of the day.
Found out why when the a/g bloke passed the QNH --1040. (compared to 99something last weekend)
A very non-CAP413 chat about it then ensued as he asked us to check it tallied with what our altimeter said because it was so unusal he was half wodering if his kit was on the fritz.
Anyone better than met at me know why it's so unusually high? I remember all the effects of highs from the exam swotting but not what causes the pressure variation in the first place!
Found out why when the a/g bloke passed the QNH --1040. (compared to 99something last weekend)
A very non-CAP413 chat about it then ensued as he asked us to check it tallied with what our altimeter said because it was so unusal he was half wodering if his kit was on the fritz.
Anyone better than met at me know why it's so unusually high? I remember all the effects of highs from the exam swotting but not what causes the pressure variation in the first place!
"Let's go flying"
Scribblings of a novice PPL
Scribblings of a novice PPL