Final answer:
Except in the case of critical discrepancies and important modifications, each Discrepancy in the M300 must have a corresponding corrective action or deferment in the Corrective Action block prior to departure.
Step-by-step explanation:
Except in the case of critical discrepancies and important modifications, each Discrepancy in the M300 must have a corresponding corrective action or deferment in the Corrective Action block prior to departure. This process ensures that any issues or deviations from the standard procedures are addressed and resolved before departure. Critical discrepancies refer to serious issues that could pose a safety risk, while important modifications are changes that require attention but may not have immediate safety implications.