What is the FMA thrust mode when VNAV is selected for a climb?

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Multiple Choice

What is the FMA thrust mode when VNAV is selected for a climb?

When VNAV is chosen for a climb, the engines are commanded to a specific N1 value to optimize the climb profile. The Flight Mode Annunciator shows N1 to indicate that thrust is being controlled as a fixed N1 schedule rather than trying to hold a particular speed. The VNAV system calculates the target N1 based on weight, altitude, temperature, and the required climb gradient, and the engines adjust to maintain that N1 to meet the VNAV climb path. Other modes like MCP SPD or VNAV SPD would indicate thrust control aimed at maintaining a selected speed or a VNAV speed target, not the VNAV climb thrust schedule, so N1 is the correct thrust mode for VNAV climbs.

When VNAV is chosen for a climb, the engines are commanded to a specific N1 value to optimize the climb profile. The Flight Mode Annunciator shows N1 to indicate that thrust is being controlled as a fixed N1 schedule rather than trying to hold a particular speed. The VNAV system calculates the target N1 based on weight, altitude, temperature, and the required climb gradient, and the engines adjust to maintain that N1 to meet the VNAV climb path. Other modes like MCP SPD or VNAV SPD would indicate thrust control aimed at maintaining a selected speed or a VNAV speed target, not the VNAV climb thrust schedule, so N1 is the correct thrust mode for VNAV climbs.

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