The add-ons are designed to counter horizontal windshear effects (wind strength decreasing as the ground is neared) and apply only to headwind component to counter loss of lift resulting from slow change to 'inertial' groundspeed.
Originally Posted by
Gordomac
My co-jo days on Viscounts were tough enough and Captains giving the inbound leg away, quite rare, until they got to know you,. Oh, AND liked you. (I hardly ever got an inbound leg. Actually, even outbound was rare......Mmmmmmmmmm.........
In the company I worked for landings on the unlengthened runway were 'captains only'. So once in the LHS your first LBA landing was your first ever as handler.
Exciting times!