YELLOW - Shows the maximum tolerance zone. Cuts anywhere within the tolerance zone will result in an acceptable part separation provided the flesh is not mutilated and the meat yield associated with the part is not materially affected.
NOTE - A cut made outside the tolerance zone exposing bone shaft (medullary cavity) is not acceptable as U.S. Grade A. Miscut product is downgraded to U.S. Grade C.
TIP - A good visible guide to let you know you've cut through the acceptable tolerance zone is a portion of the condyle (white cap or knuckle) remains on the part.
Wing tip (3rd portion) may be removed at joint between 2nd and 3rd portion or anywhere in 3rd portion as long as the cut is even and leaves no protruding bones.
Cuts through the white knuckle that expose the bone shaft are not acceptable for U.S. Grade A.