Is there a " Tail strike" Eicas message available?. .I recall an Eicas message "Tail skid" meaning it is not in its correct position, this is a different situation to a tail strike, unless you have broken it off maybe!. .I think there is a fuel penalty also if the tail skid cannot be retracted after takeoff of around 6kgs a flight hour, beloved of line check captains.. .Also you hit the tail skid with more than 10 degrees pitch up on landing on a 767-300er and with a over rapid rotation on takeoff at about 8 degrees of pitch up.. .Someone with the Boeing training manual could correct these figures as it has been a couple of years.. .B767-3300er flight with a gear leg door missing also has interesting restrictions and penalties I also remember from one dark nights trip.