When Ryanair originally started flying into Skavsta with the 800, I remember a pilot who landed on RW08 BA MED/POOR. During the landing roll he temp lost control of the a/c in an area that had BA zero. He regained control using the recommended technique, changed underpants, then went out with the Saab friction test guys who took the time to explain the following:
To have an average there must be areas below the final reported value. In this case a 100 metres at 0 BA just to the left of the CL. This info was in the Saab drivers report and could have been passed to the pilot on approach if asked for. Just ask for "the comments".
A white/black runway can be deceptive in terms of BA. Snow is grippier than ice.
Bring the a/c to taxy speed as early as possible in the landing rollout.
Unfortunately this captain thought he knew better than the SAS trained guys and ordered them to keep sweeping the runway for his departure. They told him this would be detrimental to BA as it would help shine the surface. He wouldnt listen. They night stopped. No action was ever taken against him, but two engineering pilots were sent out to NYO to learn from the experience. They wrote a great precis from a Saab/runway clearing perpsective which was handed out to RYR pilots at the time.
This LPL pilot may have been equally ignorant or perhaps quite perceptive and versed on slippery/contam runway ops. Maybe he was just passing time and has probably learnt more about contam runways than the majority of posters here will ever know!
The question I ask is why do pilots with the same licence attained through the same system have such varying opinions on such a fundamentally important area? I think the answer lies in licensing/examinations etc that in my day were still concentrating on areas such as Omega nav even though it had been withdrawn!