WNCrew From United States of America, joined Jun 2006, 1372 posts, RR: 9 Reply 1, posted (5 years 7 months 6 hours ago) and read 2534 times:
It's used for evacuation onto the wing during a water landing. Inside the sidewall of the window exit is an escape strap that would be connected to this eyelet giving pax something to hold onto as they make their way out. It can also be used to attach a slide/raft to so that when you inflate it won't float away.
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ATA 25-66 FLOATATION & SURVIVAL EQUIPMENT
Life Line Description
Life lines assist passengers evacuating the aircraft to remain on the wings after
ditching. The life lines are installed in the hatracks adjacent the emergency exits
(FR 38) left and right. Life line installation points are yellow in color for easy
identification and located as follows:
- inside each emergency exit hatch recess (top forward corner of the FWD exit; top rear corner of the AFT exit) and accessible only after the exit hatch is removed,
- on the upper surface of each wing, approximately above the outer limit of the engine nacelle
If an emergency occurs and the aircraft ditches, you must remove the exit
hatches and install the life lines. Snap hooks connect the lines to the installation
points, they are located at each end of the life lines. You can tighten the life
lines after installation when you pull on the tabs at the two sliding buckles.