Ht9100
This unit was not specific to the L1011 though. Fitted to a number of a/c including large and small Boeings, some M-Ds and early Airbus. I can't remember exactly raving about it. I have one mid-atlantic airfield in mind that has a non-precision approach with an offset TACAN and an NDB in the most useless place other than to indicate where a decent steak might be had. The approach lights there always looked pink but the tea and banana cake was worth the trip. Without wishing to provoke an A vs B argument the MMI A330 that used to go there always seemed to have a better approach than many.