Maneuvering Characteristics Augmentation System (MCAS) – flight control law implemented on the 737 MAX to improve aircraft handling characteristics and decrease pitch-up tendency at elevated angles of attack.
Angle of Attack (AOA) – the difference between the pitch angle (nose direction) of the airplane and the angle of the oncoming wind.
Angle of Attack Sensor / Vane – hardware on the outside of the airplane that measures and provides angle of attack information to onboard computers; also referred to as an AOA vane.
Angle of Attack Disagree – a software-based information feature that alerts flight crews when data from left and right angle of attack sensors disagree. This can provide pilots insight into air data disagreements and prompts a maintenance logbook entry.
Angle of Attack Indicator – a software-based information feature that provides angle of attack data to the flight crew through the primary flight displays. It is an option that can be selected by customers.
Control law – a set of software that performs flight control function or task
FCOM (Flight Crew Operations Manual Bulletin) – supplementary operations information
FOTB (Flight Operations Technical Bulletin) – supplementary technical information
Speed trim system – a system that uses multiple components to provide additional speed or pitch stability when needed