Originally Posted by
cannot
I couldn’t agree more , some carriers use a timed acceleration to either 80 or 100kts vs thrust setting . It confirms if acceleration is normal , especially useful in low vis operations where you have limited visual clues, or if there is an an EPR icing issue , or perhaps a dragging wheel or brake during contaminated runway ops
I though that most recent types (350, 787) have a take-off monitoring function that would alert the crew of abnormal performance
before they become an issue.