0-8, thanks for the info.
The DECEL light could be an interesting example where crews might inappropriately associate an ‘aircraft’ indication (total deceleration) with a particular system (auto brake) either due to the way it has been taught or from its location – false association, a problem of training/automation.
For interest, does the DECEL light work with manual braking – identifying the level selected on auto brake?
Lemurian, accepting that reverse alone could not archive the required deceleration. However, with some effective braking and aerodynamic drag there was apparently enough deceleration to achieve 80% of the target (DECEL light).
Is the light ‘latched’ ON even if the required decel level is not maintained? If it is, and the brake effectiveness reduces and/or aerodynamic component reduces (slowing down), then the thrust reverse contribution becomes a significant proportion of the total (remaining) deceleration. Unfortunately the decel level probably isn’t enough in the prevailing conditions and the crew are unlikely to determine this until it’s too late. However, there could have been some feedback from foot force when manual braking was used.