Is Cat 3B really worth it ?
I understand that maintenance costs for 3B as opposed to 3A are much greater. For the amount of time per year that the RVR is less than 200m, the costs/benefit analysis doesn't stack up.
I also recall the day when one of my (now defunct) company's aircraft sneaked into LIN when the RVR was 75m. Cockpit crew all very pleased with themselves until they realised that they were now stuck there as they needed 125m RVR to get out again.......................... and it didn't reach this level until the following day
