Though I have read almost the entire thread I am still confused:
Is it it either R2-5 closed or is it CB P40 opened that diables the TOCW.
Or is it that both can disable the TOCW?
As I read it R2-5 remained closed and left this particular line in flight mode. This heated the RAT probe and disabled the TOCW. Then P-40 was pulled that disabled the heater. But there are some references (DTW accident) that this would also have disabled the TOCW directly.
So the TOCW was disabled "twice" because of the flight mode AND the CB pulled?
Thanks for clarification.