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Old 18th Sep 2011, 18:24   #39 (permalink)
Kima
 
Join Date: Mar 2008
Location: UK, Kidlington
Posts: 3
Q. You intend to overfly a mountain ridge at an altitude of 15000ft AMSL.The average air temperature (=ISA Deviation) is 15 degree lower than ISA. The Sealevel Pressure (=QNH)1003Hpa. Which altimeter indication is needed?

15 x 15 x 4 = 900
1013 - 1003 = 10 x 27 = 270

900 + 270 = 1170

15000 + 1170 = 16170

Read Angleofattacks post.. and use the formulae
TA = IA + (4 x IA/1000 x ISA Dev) + (27 x (QNH Subscale))
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