SUPER- TANS data has AC at 468+ or - 50 feet.
But was SuperTANS
displaying information after waypoint acceptance? That question has never been addressed (except in the evidence to Lord Philip) and both Racal and MoD have studiously avoided the issue. If I switch my PC monitor off now the system is no use to me, but the computational part of it still works. The existence of data on my hard drive does not mean I have seen it.
According to the AAIB report SuperTANS was switched off before impact. Photographs clearly show the switch off. Switching off was a recognised means of clearing EMC problems. SuperTANS had a battery backup which meant (I believe) it continued processing in the background, just like my PC would. The dangers of letting Racal write their own report. It is very selective. And for many years key parts of it were withheld. Yet, Trimble were not permitted to write the report on their GPS, which had multiple faults including no Time of Day output; something perhaps significant in a crash where the timeline is of such import.
May I strongly suggest reading the evidence to Lord Philip. It really does make you think more deeply about the underlying failures and why MoD would seek to blame the pilots.