How To - Understand the Boeing 737 MAX problem

How To - Understand the Boeing 737 MAX problem

If the pilot maneuvers the aircraft hard, generating an AOA close to the stall angle of around 14°, the previously lift-neutral engine nacelles suddenly generate lift.

This lift is felt by the aircraft as a pitch-up moment because the nacelles are ahead of the CG line. This destabilizes the MAX.

To counter this instability Boeing introduced MCAS (software in the Flight Control Computer), and it appears this system has problems, initiating strong nose down trims which are not warranted. In other words - forced nose dives.

People are dying.

My recommendation: Ground every 737 MAX and ask Boeing to do an extreme QA audit of the MCAS software. There is almost certainly a bug in MCAS.

Content written and posted by Ken Abbott