Boeing issues statement on 737 MAX disagree alert

victoria@aviationnews-online.com
By victoria@aviationnews-online.com April 30, 2019 12:39

Boeing issues statement on 737 MAX disagree alert

Boeing has responded to claims made in several news outlets that certain airlines and the FAA were unaware that the disagree alert on the 737 Max was deactivated. Boeing offered customers two optional paid features relating to the angle of attack (AOA) sensor. The first was an AOA disagree alert when the two sensors disagreed and the second was an indicator giving pilots a gauge of the actual angle. Boeing has since confirmed that that the disagree alert was included as a standard feature on the MAX and that it “did not intentionally or otherwise deactivate the disagree alert on its MAX airplanes”. Boeing further confirmed that the although the disagree alert was intended to be a standard, stand-alone feature on MAX aircraft, it was “not operable on all airplanes because the feature was not activated as intended”.

The disagree alert was tied or linked into the angle of attack indicator, which is an optional feature on the MAX. Unless an airline opted for the angle of attack indicator, the disagree alert was not operable.

Boeing maintains that this alert is not a crucial safety feature and that “the air speed, attitude, and altitude displays, together with the stick shaker, are the primary flight information indicators in the flight deck. All recommended pilot actions, checklists, and training are based upon these primary indicators, not on the AOA disagree alert or the angle of attack indicator”.

Even so, when the MAX returns to the air after the software modifications are approved and certified, all MAX production aircraft will have an activated and operable disagree alert and an optional angle of attack indicator, says Boeing. All customers with previously delivered MAX airplanes will have the ability to activate the disagree alert per a service bulletin to airlines, the statement adds.

 

 

victoria@aviationnews-online.com
By victoria@aviationnews-online.com April 30, 2019 12:39