I was seeing this image and noticed a black streak behind a vent on the fuslage of the F35. What is this vent used for?

enter image description here

  • $\begingroup$ Details between the auxiliary intake and the lift fan (source) - Model - Top view $\endgroup$
    – mins
    Jul 22, 2023 at 15:57
  • $\begingroup$ I edited your answer for clarity. Your use of the word “smoke” was not really correct. None of the photos online show smoke coming out of the vent, but some do show a black residue on the fuselage. It appears that that some of the engine exhaust is vented from that hole, and it leaves a sooty stain on the aircraft. It would be nice to see what the answer is. $\endgroup$ Jul 23, 2023 at 19:34
  • $\begingroup$ @MikeSowsun Ok, Thank you Mike. $\endgroup$
    – Roh
    Jul 24, 2023 at 3:31


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