Boeing has said that for the past
several months, and in the aftermath of the fatal Lion Air Flight 610
has been developing a flight control software enhancement for the
737 MAX designed to make the aircraft safer.
The patch includes updates to the Maneuvering Characteristics
Augmentation System (MCAS) flight control law, pilot displays, operation manuals,
crew training and incorporates feedback received from airlines.
The FAA says it anticipates mandating the software enhancement
with an Airworthiness Directive (AD) no later than April, and Boeing
will deploy the new software across the 737 MAX fleet.
augmentation control law (MCAS) was implemented on the 737 MAX to
improve aircraft handling characteristics and decrease pitch-up
tendency at elevated angles of attack. It was put through flight
testing as part of the certification process prior to the airplane
Boeingís 737 MAX Flight
Crew Operations Manual (FCOM) outlines an existing
procedure to handle the event of erroneous data
coming from an angle of attack (AOA) sensor. The pilot can override the flight control law using electric trim or
manual trim. In addition, it can be controlled through the use of
the existing runaway stabilizer procedure as reinforced in the
Operations Manual Bulletin (OMB) issued on 6 November 2018.
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Boeing 737 MAX.