you arent required to appeal check swings. if you as a plate umpire feel that it is questionable you can ask for help, but it is certainly not required.
OBR 9.02 (c) comment, second paragraph:
"Appeals on a half swing may be made only on the call of a ball and when asked to appeal, the home plate umpire MUST refer to a base umpire for his judgment on the halfswing."
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GB
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