On every L-1011 I have flown on, one unique thing about them was the fact that they had illuminated "Life Vest Under Seat" signs in addition to the No Smoking and Fasten Seat Belt signs.
I wonder, what was the function of those signs? On every L-1011 flight I have been on (on DL and ATA), the signs turned on and off simultaneously with the Fasten Seat Belt signs. However, was it possible for the captain to turn them on/off separately? If so, what would be a situation where it would be turned on separately?
[Edited 2013-04-27 17:47:21]