Aircraft Incident 4 : An occurrence, other than an accident, associated with the operation of an aircraft, that affects or could affect continued safe operation if not corrected
NFPA 405 Standard for the Recurring Proficiency of Airport Fire Fighters, 2004 ed. https://www.nfpa.org/assets/files/AboutTheCodes/40 5/405-F2009-ROP.pdf, (Std: Recurring Proficiency of Airpt Fr Fightr - Amer) {303 NFC}