Shulchan Arukh, Yoreh De'ah Siman 26
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
ניקב הוושט בשעת שחיטה כנגד המקום ששחט כבר טריפה:
Seif 1 If there is a puncture in the esophagus during the slaughter and its the opposite the spot of slaughter, its considered Torn (not acceptable).
שחט הקנה וניקבה הריאה קודם ששחט הוושט או ששחט הוושט וניקבו בני מעים קודם ששחט הקנה טריפה:
Seif 2 While one is slaughtering the gullet/esophagus and one finds that the lungs are punctured before he was able to slaughter the gullet, or if while one is slaughtering the gullet/esophagus and one finds that intestines are punctured before he was able to slaughter the gullet, it is considered Torn (It's unacceptable).