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× Welcome to the CPL Meteorology question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.

Question - TTF and PROB - alternate planning

  • Posts: 7
  • Thank you received: 0

andyc created the topic: Question - TTF and PROB - alternate planning

Hi guys, quick clarification question if I may.

PROB isn't used in TTF (AIP GEN 3.5 para 3.6.3). Does that mean if I have a valid TTF for my ETA, I can ignore any PROB in the TAF?

i.e. I can just use TTF, ignore the TAF, and also discount the 30 min buffer period for any OPRs because it's a TTF?

thanks!
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  • Posts: 1902
  • Thank you received: 98

bobtait replied the topic: Question - TTF and PROB - alternate planning

That's correct. A TTF has a validity of only three hours and is replaced every hour. It's not much use trying to give a probability of variations over that time period.
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