Posts Tagged ‘Boeing 737 Max 8’

NASA database shows that pilots have reported issues in US with new Boeing jet

March 13, 2019

NASA compiles a database of voluntary pilot reports (ASRS) and this database contains at least 2 reports by US pilots who experienced problems with the auto-pilot keeping the nose down on B737 Max 8 & 9 aircraft. It is highly unlikely that the FAA does not factor these in.

Canada today also grounded the aircraft. However they have stated that had studied satellite data and found similarities between the Ethiopian and the Lion Air take-offs.

ASRS:

The ASRS database is the world’s largest repository of voluntary, confidential safety information provided by aviation’s frontline personnel, including pilots, controllers, mechanics, flight attendants, and dispatchers. The database provides a foundation for specific products and subsequent research addressing a variety of aviation safety issues.

The US reports are about the autopilot rather than the anti-stall system. The US experiences are reported in PhysOrg.

Airline pilots on at least two U.S. flights have reported that an automated system seemed to cause their Boeing 737 Max planes to tilt down suddenly.  The pilots said that soon after engaging the autopilot on Boeing 737 Max 8 planes, the nose tilted down sharply. In both cases, they recovered quickly after disconnecting the autopilot..

….

The pilot reports were filed last year in a data base compiled by NASA. ……….. It was unclear whether the accounts led to any actions by the FAA or the pilots’ airlines.

In one report, an airline captain said that immediately after putting the plane on autopilot, the co-pilot called out “Descending,” followed by an audio cockpit warning, “Don’t sink, don’t sink!” The captain immediately disconnected the autopilot and resumed climbing. “With the concerns with the MAX 8 nose down stuff, we both thought it appropriate to bring it to your attention,” the captain wrote. “Best guess from me is airspeed fluctuation” due to a brief weather system overwhelming the plane’s automation.

On another flight, the co-pilot said that seconds after engaging the autopilot, the nose pitched downward and the plane began descending at 1,200 to 1,500 feet (365 to 460 meters) per minute. As in the other flight, the plane’s low-altitude-warning system issued an audio warning. The captain disconnected autopilot, and the plane began to climb. The pilots talked it over later, “but can’t think of any reason the aircraft would pitch nose down so aggressively,” the co-pilot recounted.

Preliminary information released by Indonesian investigators suggests they are looking at the possible role of the Max’s new automated anti-stall technology as a factor in a Lion Air crash in October shortly after takeoff from Jakarta. Data indicates that the pilots struggled with repeated nose-down commands from the plane before it crashed into the Java Sea and killed 189 people.

However, that anti-stall system—called MCAS for its acronym—only activates if the autopilot is turned off, according to documents Boeing has shared with airlines and the FAA. “That’s not to say it’s not a problem,” American Airlines pilot Dennis Tajer said of the incidents reported to NASA, “but it is not the MCAS. The autopilot has to be off for MCAS to kick in.”

……….

It is time for Boeing and the FAA, but primarily for Boeing, to ground the aircrafts till they have sorted out the clearly deficient software.

Boeing share price is in a decline if not yet in a nose-dive.


 

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Boeing must itself ground its 737 Max 8 aircraft till software update is completed (in April)

March 12, 2019

Boeing put out a statement last night.

For the past several months and in the aftermath of Lion Air Flight 610, Boeing has been developing a flight control software enhancement for the 737 MAX, designed to make an already safe aircraft even safer. This includes updates to the Maneuvering Characteristics Augmentation System (MCAS) flight control law, pilot displays, operation manuals and crew training. The enhanced flight control law incorporates angle of attack (AOA) inputs, limits stabilizer trim commands in response to an erroneous angle of attack reading, and provides a limit to the stabilizer command in order to retain elevator authority. 

Boeing has been working closely with the Federal Aviation Administration (FAA) on development, planning and certification of the software enhancement, and it will be deployed across the 737 MAX fleet in the coming weeks. The update also incorporates feedback received from our customers.  

The FAA says it anticipates mandating this software enhancement with an Airworthiness Directive (AD) no later than April. We have worked with the FAA in development of this software enhancement.

Today a number of other countries and airlines have grounded the aircraft. The UK joined the ban following Ethiopia, Singapore, China, France, Ireland, Germany, Australia, Indonesia and Malaysia. TUI and Norwegian are among the airlines which have also grounded the aircraft.

It seems to me that instead of getting all their lobbyists to cast doubt on pilots or their training it should be Boeing which itself grounds the aircraft. When Boeing itself is introducing the software enhancement as a result of the Lion Air crash, and possibly has the 157 deaths of the Ethiopian crash on their plate, it is unconscionable for them to allow the planes to fly.They cannot lean back and use the FAA as their backstop. The FAA itself needs to develop a backbone when it comes to US manufacturers.

Boeing cannot just take the position that once was accident, the second merely coincidence and wait for a third crash.


 

If the Ethiopian Air crash is a repeat of the Lion Air crash then Boeing has blood on its hands

March 11, 2019

If the Ethiopian Air Boeing 737 Max 8 crash turns out to be a repeat of the Lion Air crash just four months ago, then it does not matter whether or not Boeing issued new pilot training manuals or not. It would be a repeat of a crash with a new aircraft within 4 months with devastating effects. Boeing cannot wash their hands off how the same error could have been allowed to happen again. I observe that they claim to have issued new training manuals after the Lion Air crash and are said to have quietly introduced some software patches.

Boeing share price was initially hit. But I also observe that some “analysts” are already trying to shield Boeing and suggesting that perhaps Ethiopian Air may not have been up-to-date with training their pilots. Others chip in that Boeing cannot be held responsible for bad or obsolete pilot training. Other technical “experts” are also being deployed across the air waves to claim that there is no fundamental design flaw. The Boeing protection lobby has swung into action and the share price is now recovering.

But if, for whatever reason, it is a repeat crash then it is clear that Boeing did not do enough to make sure that such loss of life never happened again. 

The blood of the 157 who died are then clearly on Boeing’s hands. How far the FAA shares some blame will probably never be revealed.


Related:

Are Boeing and the FAA complicit in two B737 Max 8 crashes and 346 deaths?


 

Are Boeing and the FAA complicit in two B737 Max 8 crashes and 346 deaths?

March 11, 2019

Boeing plays down system flaws as two planes crash and the B737 Max 8 is grounded in China.

It is difficult to avoid the conclusion that management decisions by Boeing, and lax regulatory oversight to help Boeing in the competition against the A320, have now together contributed to two crashes and 346 deaths.

Any passenger on a B737 Max 8 would be justified in asking – before boarding –  if the pilots knew how to override the MCAS system


In October 2018, a Lion Air Boeing 737 Max 8 flying from Jakarta on a domestic flight crashed 13 minutes after take-off, killing all 189 passengers and crew on board.

Now an Ethiopian Airlines Boeing 737 Max 8 has crashed, again shortly after takeoff killing 157.

It is highly likely that in spite of much “damage control” publicity aimed at blaming the pilots in the Lion Air case, it was a design flaw in in a little known system which forced both planes to crash.

Lion Air Flight JT610went down shortly after takeoff in October 2018. A little-known system known as the Maneuvering Characteristics Augmentation System (MCAS) was suspected to be a factor in the disaster, according to a preliminary report by Indonesian investigators in November. MCAS is an automatic feature that detects if the nose of the plane is pitched up too high and pushes it down to prevent the craft from stalling. The system is needed since the engines on the 737 Max are bigger than previous models of 737s. …… 

In the Lion Air crash, Indonesian investigators suspect a faulty sensor triggered the MCAS system, forcing the nose of the plane down. The preliminary report determined the pilots tried to raise the nose of the aircraft more than 20 times during the 11 minutes it was in the air. Eventually, the pilots told air traffic controllers they were flying the plane manually and couldn’t determine their altitude. The plane plunged into the sea moments later.

The similarities between the two crashes are unlikely to be just coincidence.

  • Both Aircraft Were Boeing 737 MAX 8s
  • Both Crashes Happened Shortly After Takeoff
  • Both pilots Struggled to Maintain A Steady Climb
  • Both were first Flights of the Day

What is of more relevance is that Boeing (allowed by the FAA) decided it was not necessary to inform pilots about software changes to the MCAS system to save on pilot retraining costs. Ways of getting around the design flaw which kept forcing the nose down were not disseminated in the effort to downplay the flaw and to save costs. The NYT reported on 3rd February:

Boeing’s strategy set off a cascading series of engineering, business and regulatory decisions that years later would leave the company facing difficult questions about the crash in October of a Lion Air 737 Max off Indonesia. …….

……. But the tragedy has become a focus of intense interest and debate in aviation circles because of another factor: the determination by Boeing and the F.A.A. that pilots did not need to be informed about a change introduced to the 737’s flight control system for the Max, some software coding intended to automatically offset the risk that the size and location of the new engines could lead the aircraft to stall under certain conditions.

That judgment by Boeing and its regulator was at least in part a result of the company’s drive to minimize the costs of pilot retraining. And it appears to have left the Lion Air crew without a full understanding of how to address a malfunction that seems to have contributed to the crash: faulty data erroneously indicating that the plane was flying at a dangerous angle, leading the flight control system to repeatedly push the plane’s nose down.

…… Those decisions ultimately prompted the company, regulators and airlines to conclude that training or briefing pilots on the change to the flight control system was unnecessary for carrying out well-established emergency procedures.

It is difficult to avoid the conclusion that management decisions by Boeing, and lax regulatory oversight to help Boeing in the competition against the A320, have now together contributed to two crashes and 346 deaths.

China has now grounded all Boeing 737 max 8 aircraft.


 


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