PPRuNe Forums - View Single Post - Cold WX Altimetry Procedures
Thread: Cold WX Altimetry Procedures
View Single Post
Old 18th February 2003 | 19:31
  #17 (permalink)  
Dick Whittingham
 
Joined: Oct 2000
Posts: 461
Likes: 0
From: Bristol
The key temp is ISA deviation, assumed in the Rule of Thumb to be the same at all heights. You can have it quoted directly, or work it out from OAT/ height or airfield sfc temp/airfield elevation. 4% for every 10deg of ISA dev.

Dick W
Dick Whittingham is offline