FCeng84
A difference between heading and track angles as displayed on the PFD would be an indication of sideslip in the absence of any crosswind
… not at all ! ! ! When a symmetric a/c is flying with a correctly installed sideslip indicator , and zero bank angle , the difference between track and heading is only the wind correction angle ! no reference to sideslip at all ( which is zero) !
You can see this during an approach to landing with strong side wind component : if you approach with a sideslip, your sideslip indicator will show , obviously, off-centre,(though track and heading will be the same), but if you approach with a crab angle (zero roll angle), track and heading will be different , but no sideslip at all. Just change the phase of flight from ‘approach to landing’ to ‘cruise’ and you will surely better figure this .
D