When is a yellow triangle displayed for the payload margin in ALIS?

The yellow triangle displayed for the payload margin in ALIS serves as a caution signal regarding the payload capacity of an aircraft. This triangle is specifically shown when the payload margin is more than 1000 pounds below the maximum payload. This indicator is crucial for flight planning and safety, as it alerts the flight crew and operational teams that they are approaching a potentially critical threshold in terms of payload capacity.

When the payload is significantly below the maximum limit, particularly more than 1000 pounds, this indicates that the aircraft is underutilized which could affect economic factors such as fuel efficiency and operational planning. The caution alert is designed to prompt crews to review the cargo load or consider operational adjustments to optimize performance while ensuring safety.

In contrast, other options mention different thresholds and conditions that do not accurately represent when the yellow triangle is displayed in ALIS. Generally, values like equal to 1000 pounds or less than 3000 pounds for widebody aircraft do not trigger this specific caution, emphasizing that only the scenario where the margin exceeds 1000 pounds below the maximum payload accurately reflects the requirement for the yellow triangle indicator.