What are those things on the B747 engine pylons? I noticed some dots and lines on the Boeing 747 engine pylons. What are they?



The above image is as seen in this video at 2:18.
These are latches holding the engine support pylon panel in closed. Behind this panel is the diagonal brace.

This area was modified ~1992 due to the El Al Flight 1862 and China Airlines Flight 358 crashes.



See FAA Lessons Learned (via archive.is).