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Printed page 256. PDF page 256.
Boeing to reconsider the design of the system in such a way that AOA data input from both sensors (LH&RH)are received and analyzed by FCC before sending any command to MCAS. 256Open final report at PDF page 256Aircraft Accident Investigation Report B737 MAX 8, ET-AVJ
Printed page 48. PDF page 48.
Yaw Damper (SMYD) computer and the second resolver is connected the respective ADIRU. Both the SMYD and ADIRU monitor the resolver circuits within the AOA sensor. If a fault is detected, the AOA resolver information is not used and theOpen final report at PDF page 48Aircraft Accident Investigation Report B737 MAX 8, ET-AVJ
Printed page 262. PDF page 262.
force gradient at elevated AOA. The enhancements include AOA signal monitoring (from both AOA sensors), activation and stabilizer resynchronization logic, Maximum command limit and flight deck alerting. These enhancements provide additional functionality to prevent erroOpen final report at PDF page 262Aircraft Accident Investigation Report B737 MAX 8, ET-AVJ
Printed page 305. PDF page 305.
Damper (SMYD) computer and the second resolver is connected to the respective ADIRU. Both the SMYD and ADIRU monitor the resolvers within the AOA sensor for short or open circuits. If a fault is detected, the AOA resolver information isOpen final report at PDF page 305Aircraft Accident Investigation Report B737 MAX 8, ET-AVJ
Printed page 323. PDF page 323.
the new design, Boeing eliminated MCAS reliance on a single AOA sensor signal by using both AOA sensor inputs and through flight-control law changes that include safeguards against failed or erroneous AOA indications. The updated FCC software with revised flight-controlOpen final report at PDF page 323Aircraft Accident Investigation Report B737 MAX 8, ET-AVJ
Printed page 8. PDF page 8.
which includes the MCAS. o The software updates include AOA signal monitoring (from both AOA sensors), MCAS activation and stabilizer resynchronization logic, maximum command limit, and flight deck alerting. o These software enhancements provide additional functionalitOpen official document at PDF page 8US comments on the ET302 draft report