Sig, interesting views.
Because ‘slippery when wet’ is additive, not directly related to weather or runway contaminants, it might be better used to reduce the assessed braking action; select the next lower value.
‘Tower’ information is advisory; it might be the best assessed or calculated, or their best guess by looking out of the window, worst still, incorrectly passing on a PIREP.
None of these remove the need for reassessment according to the situational conditions.
Some operators have a rule of thumb which linked any red WXR over the airfield in the preceding 15 min, to the assumption of a flooded runway.
Risk is not determined by assessing what is known, it’s the understanding of what is not known and possible consequences of the knowledge gap.
Last edited by PEI_3721; 19th Dec 2018 at 13:28.
Reason: typo