[Salgak]

Yes, and no. A MANPAD **would** home in on an engine, but generally generate a "donut" shaped explosion, due to the shaping of the charge. Generally, enough to rupture the wing, and more importantly, the wing fuel tanks.

Maybe I'm being pessimistic, but I'd PLAN on a MANPAD being able to down a jetliner, and plan security accordingly. . .

[WestPacSailor]

...I'd PLAN on a MANPAD being able to down a jetliner, and plan security accordingly

Certainly a wise course of action. Plan for the worst, and take action accordingly.