2.2.4 Retard flare mode
A mode of the autothrottle that is important with regard to the accident is the ‘retard flare’ mode. This mode reduces engine thrust to idle in combination with a nose up pitching movement (by the autopilot). During this movement, which is called a ‘flare’, the autothrottle moves the thrust levers fully to the idle stop just before the aircraft touches the runway with its main wheels. This causes the aircraft to lose speed. The pilot can move the thrust levers forward, however, the autothrottle will pull them back when the pilot stops applying forward pressure to the thrust levers unless the autothrottle is disengaged manually. In this mode the autothrottle will be deactivated automatically two seconds after landing.
The ‘retard flare’ mode is activated, when a number of conditions are met: the radio height is less than 27 feet, the flap position is more than 12.5 degrees, a speed mode of the autothrottle is active (like MCP SPD) and the aircraft is not climbing or descending to a selected altitude or does not maintain a selected altitude. The ‘retard flare’ mode is indicated on the primary flight display with ‘RETARD’.
2.2.4 Retard flare mode
A mode of the autothrottle that is important with regard to the accident is the ‘retard flare’ mode. This mode reduces engine thrust to idle in combination with a nose up pitching movement (by the autopilot). During this movement, which is called a ‘flare’, the autothrottle moves the thrust levers fully to the idle stop just before the aircraft touches the runway with its main wheels. This causes the aircraft to lose speed. The pilot can move the thrust levers forward, however, the autothrottle will pull them back when the pilot stops applying forward pressure to the thrust levers unless the autothrottle is disengaged manually. In this mode the autothrottle will be deactivated automatically two seconds after landing.
The ‘retard flare’ mode is activated, when a number of conditions are met: the radio height is less than 27 feet, the flap position is more than 12.5 degrees, a speed mode of the autothrottle is active (like MCP SPD) and the aircraft is not climbing or descending to a selected altitude or does not maintain a selected altitude. The ‘retard flare’ mode is indicated on the primary flight display with ‘RETARD’.
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