Whilst on the subject of intercoms, ground-crew and being airborne.
Some years ago, we were in the cruise at FL310 when the 'GROUND CALL' light illuminated. This conjured up visions of some poor sod clinging-on for dear life. I looked at the First Officer in disbelief and said "you sure we got visual clearance from the ground-crew?"
A few days later someone else flying the same a/c complained when the 'GROUND CALL' light illuminated at about 1000' during the approach.
