Do all those abnormal indications in the cockpit give you a complete overview of the situation? How can you be certain that there is not more to it? Let's look back a couple of months
Better still, lets look back 10 or 20 or 40 years and all those millions of flights that dangerously flew around with "normal" indications. Do all those NORMAL indications in the cockpit give you a COMPLETE overview of the situation?
You will never have a complete overview in the same way a medical check doesn't mean you will be fit to fly for a year.
As was said earlier, it's airmanship based on experience, information, 3rd party input.
Continuing a flight because everything seems normal, does not mean that it is safe.
Better take the boat then
