The currently recommended figure of three times the number of thousands of feet was arrived at through extensive TE research and is now a JAR-compliant standard for most types. In addition, it fulfils the requirements of ETC and CE. It will, provided you apply the corrections for external conditions laid down by YOE, remain within the acceptable limits of the ITBP tolerances.
I feel that a few of the acronyms may warrant an explanation:
TE – Trial and Error
JAR – Just About Right
ETC – Easy To Calculate
CE – Close Enough
YOE – Years Of Experience
ITBP – In the BallPark
Last edited by ft; 9th Jul 2012 at 08:03.