74:31:01:01.05Major and minor

fiber release episode defined. A major fiber release episode is any uncontrolled or unintentional disturbance of ACBM resulting in a visible emission which involves the falling or dislodging of more than three square or linear feet of friable ACBM. A minor fiber release is the uncontrolled or unintentional disturbance of ACBM resulting in a visible emission which involves the falling or dislodging of three square or linear feet or less of friable ACBM.

Source: 21 SDR 101, effective December 4, 1994.