Take the 2-minute tour ×
Aviation Stack Exchange is a question and answer site for aircraft pilots, mechanics, and enthusiasts. It's 100% free, no registration required.

I was flying on an A320 (equipped with sharklets) the other day, and I found these hooks on the wing's surface:

Note that the single hooked attachment is outside the wing's "DO NOT WALK OUTSIDE THIS AREA" line. What are these hooks used for? Why is the single hooked attachment outside the "safe" walking area line?

share|improve this question
    
my first guess would be attachment points for the emergency slide –  ratchet freak Mar 19 at 10:44

3 Answers 3

up vote 12 down vote accepted

In the event of a water evacuation, there is a line associated with each overwing exit that is extended, and clips to that yellow bracket, as a guide to get everyone out on the wing.

From Wikipedia, these are for overwing exits.

The use of overwing exits in a ditching varies from airline to airline. On aircraft fitted with overwing exits, there is typically a raised escape rope bracket (about a third of the way from the door) attached to the wing's upper surface and typically painted yellow. This is accompanied by an escape rope found in the frame of the exit after opening the hatch. Once this rope is attached to the escape rope bracket, it will aid passenger evacuation onto the wing to await rescue or to enter the water (depending on the airline's procedures). On aircraft with life rafts to be launched via the overwing exit, the wing will be used to provide a boarding platform onto the life raft. On certain regional aircraft, the overwing exits are the only escape route in the event of a ditching.

share|improve this answer
    
Thanks, this is what I was looking for. Isn't having ONLY overwing exits on regional craft a bad idea if a wing mounted engine catches fire or if the turboprop hasn't stopped spinning? –  shortstheory Mar 21 at 10:13
    
Most larger airplanes have several doors, not just over the wings. Depending on the situation, some or all can be used. In case of Flight 1549, the overwing exits were the most important ones. –  Farhan Mar 21 at 19:52

Likely they are tethering points for emergency exit ropes. The Boeing 737-800 has the same type of hooks. See top row from the water evacuation procedures:Boeing 737-800 evacuation procedures(Image source: http://flight72.storenvy.com/collections/132463-safety-cards/products/120964-delta-airlines-boeing-737-800-safety-card)

share|improve this answer

Possible explanations:

  • The inner one is a mounting points for evacuation slides. The A320 and B737 have additional overwing life rafts for ditching. You clip in a rope, throw it overboard, and give it a sharp tug to inflate.

  • The outer one works as a harness securing points for the maintenance guys working on the wing, but I guess this could be used for the first purpose as well.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.