Boeing, FAA to Issue Safety Alerts Following Lion Air Crash

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Responding to the Lion Air jetliner crash that killed 189 people in Indonesia last week, manufacturer

            Boeing
Co.

BA 01.24%

and U.S. aviation regulators intend to issue twin safety warnings about potential suspect flight control software that can be confused

How to detect a problem, that is, a glitch or misinterpretation by pilots-related to an essential system that measures how high or low a plane's nose is pointed-may have played an important part in the sequence of events that caused the Boeing 737 Max 8 to plunge into the Java Sea.

These lines can be misinterpreted by pilots when they are flying manually, even as security systems automatically adjust flight-control surfaces to push the nose of the plane downward, these people said.

The anticipated actions by Boeing and the U.S. Federal Aviation Administration preliminary, these people said, and are expected to be short of urgent or mandating replacement or inspection of any specific onboard system. Rather, highlighting potential hazards stemming from the interaction of certain software with various other cockpit alerts, and reiterating the importance of following standard procedures under such circumstances.

In the wake of the previous crashes in which the pilot error or confusion were the safety of certain aircraft systems and the importance of pilots' following recommended procedures.

In this case, we suggest you to avoid misunderstanding or improperly reacting to certain cockpit displays or alerts when manually flying the aircraft.

The crew of Lion Air Flight 610 reverted to manual flight after experiencing unreliable airspeed indications shortly after takeoff from Jakarta in good weather. Minutes after the crew communicating the problem with the twin-engine plane.

While it is a problematic software, the warnings do not explicitly link that system to the cause of the Oct. 29 accident. Other factors may have contributed to the investigation.

Airline and FAA safety experts have been identified as a previous pattern of similar software issues in the fleet. The problem may be due to the fact that this may be due to the accident. Investigators have not publicly described such a scenario.

As early as Tuesday evening, the Chicago-based plane maker was expected to issue an operations bulletin to all airlines flying 737 Max 8 variants. They said that the document refers to software associated with the angle-of-attack system.

Within hours, FAA officials are presented to complementary follow-up safety document raising the same issues, these people said. The emergency airworthiness directive will be binding on all U.S. carriers flying Boeing 737 Max 8 versions and is expected to be embraced by world-wide regulators.

Not just such as rapid action. Drafting and coordinating the pair of safety warnings.

More broadly, investigators are trying to understand the problem of the crashed airspace.

Write to Andy Pasztor at andy.pasztor@wsj.com

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