|Quoting LTC8K6 (Reply 3):|
Looks like a lot of structural patching...
|Quoting Viscount724 (Reply 4):|
It's common on many older aircraft to overcome "aging" issues related to fatigue, cracking etc. Enlarge the photo below and note all the "doubler" patches on the 25-year-old WN 733 below, including a large one above the windows starting just behind the first window, many smaller ones below the windows and in other places, including a large one around the upper left hand corner of the door.
|Quoting HAWK21M (Reply 8):|
These Patches in the Frontal areas of the fuselage would contribute to significant payload restrictions due performance penalties.
|Quoting tdscanuck (Reply 9):|
Is that a documented thing? Beyond the weight, those patches are so thin that I doubt they're even penetrating the boundary layer once you get a few frames back.