Source: FliegerFaust

 – October 8th, 2019

 

Boeing Co.’s delay-prone effort to return 737 MAX jets to service has hit a new snag, according to people familiar with the details, due to heightened European safety concerns about portions of proposed fixes to flight-control systems.

Disagreements over various software details, centered on how the MAX’s dual flight-control computers are now intended to start working together, haven’t been reported before.

 

[…]

 

The European Union Aviation Safety Agency recently told senior U.S. regulators it wasn’t satisfied that FAA and Boeing officials had adequately demonstrated the safety of reconfigured MAX flight-control computers, according to people briefed on the discussions.

The aim is to add redundancy by having both computers work simultaneously to eliminate hazards stemming from possible chip malfunctions identified months ago; over decades, and on previous versions of the 737, only one computer at a time has fed data to automated systems, alternating between flights.