Under which condition should an aircraft weight and balance be checked?

• A. At initial delivery
• B. During programmed depot maintenance
• C. When major modifications or repairs affect weight and balance
• D. Whenever specified by ACMS

Answer: (D)

Weight and balance must be rechecked whenever the aircraft’s weight or its distribution could have changed and the Aircraft Condition Monitoring System (ACMS) directs a check. The ACMS continually monitors data related to loads, configurations, and systems, and it can trigger a W&B recalculation when changes occur—such as different payloads, installation or removal of heavy equipment, or updates to data that affect center of gravity. This automated prompting ensures the airplane remains within the approved weight and CG envelopes for safe operation. While initial delivery, programmed depot maintenance, or major modifications/repairs typically require W&B checks per procedures, the ACMS provides the timely, condition-driven trigger to perform the check as needed.