I was recently flying on an United Airlines A320 and noticed a narrow section between the overhead storage bins with a placard labeled "Lifeline Extension Belt" on it. It was over the wing exit row. What exactly is a lifeline extension belt?
Unfortunately I didn't get a picture, but what I'm referencing can be seen in these photos (not copied here since they are copyrighted):
- https://www.flickr.com/photos/oliverporter/7653848312 (on the top-left)
- https://www.flickr.com/photos/49111993@N00/13890509784 (narrow section is visible rising from the forward exit to the overhead compartment, no placard)