If the lung was pierced but the (inner) wall of the chest seals the hole, the animal is kosher. Ravina says, this is only true if the lung strongly (savich) to the (intercostal) muscle. (Chullin 47a)
Rashi: If it adheres to the rib, rather than muscle, it is NOT kosher.
What if it attaches to both the muscle and the rib?
Rambam (Shechita 11:10) quotes his father as ruling strictly, but he himself rules leniently.
Yam Shel Shlomo (Maharshal) 44:
"A great principle in areas of doubt that are not resolvable with Talmudic proofs, and must be resolved with logic, is that one must follow the decisions of the Rambam, especially in areas relating to nature, such as this one and others like it"
Comment: See the words of Raavad on Hilchos Kiddush Hachodesh 7:7

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