[QUOTE=Old Smokey;2975534]I think that this one is a bit of over-kill on behalf of your company's SOPs I-2021.
What a good SOP might include is a statement to the effect that if the Actual Takeoff Weight is at or close to the limit for the De-Rated thrust (beware the difference between De-Rated and Reduced Thrust), then the Full Thrust rating, with appropriate Reduced Thrust (Assumed / Flex), should be used. As an example, if the temperature is 40 degrees, and your weight is at or close to the TO-1 De-Rate limit, then Full TO with reduction (e.g. Full TO and Assumed / Flex 50 degrees) should be used.
Please can you explain why is it better to T/O with full TO assumed 50, then with TO-1 with no assumed temp reduction? How about normal conditions (no temp inversion expected)?
Thnx