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U.S. Business Software upgrade for 737 Max jetliner will be deployed in coming weeks, Boeing says

Boeing Co said on Friday its software upgrade for the grounded 737 Max jetliner will be rolled out in the coming weeks, and that its timeline for deploying the upgrade has not changed.

Boeing has been working on a software upgrade for an anti-stall system and pilot displays on its fastest-selling jetliner in the wake of the deadly Lion Air crash in Indonesia in October. Similarities between the flight path in the Lion Air incident and Sunday’s Ethiopian Airlines crash have raised fresh questions about the system.

Boeing to roll out software upgrade

to its anti-stall system

The Boeing 737 Max incorporates the Maneuvering

Characteristics Augmentation System (MCAS) – an

anti-stall feature introduced to compensate for the

heavier engines, which changed the aerodynamics

of the jet, tending to push the nose of the aircraft up

HOW MCAS WORKS

AOA sensor

Winglet aligns

itself with

airflow

Level flight: Normal angle of

attack (AOA) – angle at

which airflow hits aircraft

Aircraft trajectory

Air flow

CFM Leap-1B turbofan engine

Nose-up flight

A high AOA puts aircraft at risk

of stalling. MCAS is automatically

triggered, moving the horizontal

stabilizer trim counterclockwise,

which pushes the

jet’s nose down

Longitudinal

axis of aircraft

Angle

of attack

Aircraft

trajectory

Air flow

Measured angle of attack

System activates only when plane is being flown

manually, in flaps-up flight, and typically during

steep turns

the globe and mail, Sources: graphic news;

AP; JAO Aero Media LLC; the New York Times;

Seattle Times; the air current

Boeing to roll out software upgrade

to its anti-stall system

The Boeing 737 Max incorporates the Maneuvering

Characteristics Augmentation System (MCAS) – an

anti-stall feature introduced to compensate for the heavier

engines, which changed the aerodynamics of the jet,

tending to push the nose of the aircraft up

HOW MCAS WORKS

AOA sensor

Winglet aligns

itself with

airflow

Level flight: Normal angle of

attack (AOA) – angle at

which airflow hits aircraft

Aircraft trajectory

Air flow

CFM Leap-1B turbofan engine

Nose-up flight

A high AOA puts aircraft at risk

of stalling. MCAS is automatically

triggered, moving the horizontal

stabilizer trim counterclockwise,

which pushes the

jet’s nose down

Longitudinal

axis of aircraft

Angle

of attack

Aircraft

trajectory

Air flow

Measured angle of attack

System activates only when plane is being flown

manually, in flaps-up flight, and typically during

steep turns

the globe and mail, Sources: graphic news; AP; JAO

Aero Media LLC; the New York Times; Seattle Times;

the air current

Boeing to roll out software upgrade to its anti-stall system

The Boeing 737 Max incorporates the Maneuvering Characteristics Augmentation

System (MCAS) – an anti-stall feature introduced to compensate for the heavier engines,

which changed the aerodynamics of the jet, tending to push the nose of the aircraft up

HOW MCAS WORKS

AOA sensor

Level flight: Normal angle of attack (AOA)

– angle at which airflow hits aircraft

Winglet aligns

itself with

airflow

Aircraft trajectory

CFM Leap-1B turbofan engine

Nose-up flight

A high AOA puts aircraft at risk

of stalling. MCAS is automatically

triggered, moving the horizontal

stabilizer trim counterclockwise,

which pushes the

jet’s nose down

Longitudinal

axis of aircraft

Angle of attack

Aircraft

trajectory

Air flow

Measured angle of attack

System activates only when plane is being flown manually,

in flaps-up flight, and typically during steep turns

the globe and mail, Sources: graphic news; AP; JAO Aero Media LLC;

the New York Times; Seattle Times; the air current

Boeing said on Monday it has been working closely with the U.S. Federal Aviation Administration on development, planning and certification of the software upgrade, and it will be deployed across the 737 Max fleet in the coming weeks.

The FAA expects to approve these design changes no later than April 2019, it has said.

Boeing shares rose as much as 1.5 per cent in midday trading, reversing course from losses of about 1.5 per cent earlier in the session.

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