almost 2 years
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Smin1080p
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Hey!
The lock distance for missiles of this type greatly depends on the IR radiation of a given target. Front aspect radiation depends greatly on aerodynamic heating and internal equipment heating. Therefore in situations where it's a lock from this angle, it can be a lot less than the stated stat card range.
Keep in mind also that the aerodynamic heating of helicopters is very low compared to a fixed wing aircraft like a jet, so the lock-on distance is not as long in some situations.