CrewChief32 From Germany, joined Dec 2000, 418 posts, RR: 0
Reply 2, posted (11 years 4 months 1 week 3 days 23 hours ago) and read 1178 times:
This is indeed a optical reminder for the ground crew, in this case for the catering truck driver......
Depending on the airline you will see these stripes on the other side, too, as the door is very close to the wing root and the platforms of jetways (and some type of gangways) are more than twice as wide as the the door so that there will be not much space for manouvering.
These stripes are also most noticeable at the TU-154 as the second door is even closer to the wing root.