16-10-2010, 09:25 PM
(16-10-2010, 01:54 PM)interesting_signal Wrote: I think I may not have made myself clear on the last post.
I was referring to the 'BD clear after BD, BC occ' statement as oppose to the comprehensive A/L.
You did say sequence; I misread.
Strictly in conventional RRI, the TASR picks when BC and BD are simultaneously occupied and sticks around BC whilst BD is continuously proved occupied. A contact of the TASR is used in series with BC clear and so I agree that to get the approach locking release then BC must be clear with BD occupied so it is ccertainly not wrong to write this- traditionally however we haven't.
If you want to write it like this anyway then I'm sure that is fine.
PJW

