Not quite right: the reheats ignite if
The N1 of number 4 engine is limited to a maximum value of 88% up to 60kts, thus within the operational requirements of the reheat.
(At temperatures colder than -35°C the engine control schedule limits the N1 of all engines to 88% or less.)
Originally Posted by Brit312
Up to 60 kts the F/E could reselect a failed reheat so hoping it would be OK by 100kts
Regards