It does not look good for Boeing (or the FAA).
It seems that a sensor advising of a malfunction of the MCAS was deactivated intentionally and made an optional extra to be bought separately.
“Not fit for purpose” comes to mind.
Boeing de-activated a signal designed to advise the cockpit crew of a malfunctioning of the MCAS system ……. Boeing had opted to make the malfunction alert an optional extra costing more money — and had deactivated the signal on all 737 MAX …….. Neither of the Boeing 737 Max planes in the Lion Air crash in Indonesia or the Ethiopian Airlines crash were equipped with the signal that is supposed to show a malfunctioning of the MCAS
It seems that at some level within the FAA this was seen as a potential problem last year, but the issue was not escalated within the FAA nor was it acted upon.
If surviving a flight is an optional extra an accident is no longer a random event. What somebody at Boeing did may not have been murder but it comes preciously close to manslaughter.
Yahoo News: New York (AFP) – US regulators considered grounding some Boeing 737 MAX planes last year after learning of a problem with a system that is now the main suspect in two deadly crashes, a source close to the matter said. Investigators in the Lion Air crash in October off the coast of Indonesia and the Ethiopia Airlines disaster in March have zeroed in on the planes’ anti-stall system, called the Maneuvering Characteristics Augmentation System, or MCAS.
Last year, inspectors with the Federal Aviation Administration discovered Boeing de-activated a signal designed to advise the cockpit crew of a malfunctioning of the MCAS system, the source said. The inspectors were in charge of monitoring Southwest Airlines, the biggest user of 737 MAX planes, with a fleet of 34 of them at the time, added the source.
Before the Lion Air crash, which killed all 189 people on board, “the (signals) were depicted as operable by Boeing on all MAX aircraft” regardless of whether the cockpit crew thought they had them turned on or off, said a Southwest spokeswoman. She said after the accident, Boeing told Southwest the signals were “turned off unless they were specifically designated as being turned on” — prompting the airline to choose that option for all its aircraft. It was at that point inspectors learned Boeing had opted to make the malfunction alert an optional extra costing more money — and had deactivated the signal on all 737 MAX delivered to Southwest without telling the carrier. They considered recommending grounding the planes as they explored whether pilots flying the aircraft needed additional training about the alerts, said the source. They decided against that — but never passed details of the discussions to higher-ranking officials in the FAA, the source said, confirming a story in The Wall Street Journal.
……… The Ethiopia Airlines crash left all 157 people on the plane dead and led to all Boeing 737 Max planes all over the world being grounded. In this case too the MCAS is being looked at as a possible cause of the crash.
In times of mid-air distress, the system is supposed to activate on its own and push the nose of the plane down to keep it from stalling. Boeing is working on changing the MCAS so it can get the planes back in the air. The grounding has already cost the carrier a billion dollars, Boeing said last week. But the bill will probably climb because Boeing is expected to pay money to airlines forced to cancel thousands of flights and hire more reservations and services staff. Boeing has suspended deliveries of Boeing 737 Max planes and cut production of them by 20 percent.
Neither of the Boeing 737 Max planes in the Lion Air crash in Indonesia or the Ethiopian Airlines crash were equipped with the signal that is supposed to show a malfunctioning of the MCAS, an industry source told AFP in March. Called “disagree lights” in Boeing parlance, these lights turn on when faulty information is sent from so-called angle of attack sensors to the MCAS. Those sensors monitor whether the wings have enough lift to keep the plane flying. ….
image – Zero Hedge
The k2p blog 