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Thread: Lion Air 737 MAX Crash, Jakarta

  1. #1
    Join Date
    Feb 2003
    Suki yaki

    Unhappy Lion Air 737 MAX Crash, Jakarta

    ATW Online; Monday 29 October 2018
    Answers sought to cause of Lion Air Boeing 737 MAX crash

    A Lion Air Boeing 737 MAX 8 crashed into the sea shortly after takeoff from Jakarta’s Soekarno-Hatta International Airport, with no reports of survivors. It is the first crash of a MAX narrowbody.

    Flight JT610 took off from Jakarta at around 6:20 a.m. local time on Oct. 29, and was scheduled to arrive at Depati Amir Airport in Pangkal Pinang City, Indonesia, at 7:20 a.m. However, the aircraft lost contact around 6:33 a.m.

    Indonesian officials have confirmed the crash, and aircraft debris and human remains have been recovered from the water. Search and rescue divers are on site. The fuselage has not yet been located and is believed to be more than 30 meters underwater in the Java Sea.

    Local media reported the pilots requested a return to Jakarta before losing contact with air traffic controllers. There has been no indication of bad weather in the area.

    The aircraft, PK-LQP, first flew on July 30 and was delivered to Lion Air in August. Lion Air operates 11 737 MAX 8s, according to the Aviation Week Intelligence Network’s fleet database. The carrier has more than 250 737 MAX aircraft on order, and carriers within the Lion group were first to operate both the -8 and -9 variants. Lion Air Group was also among the first to order the largest MAX variant, the -10.

    According to Flightradar24 data, the aircraft climbed to an altitude of 2,050 ft. and reached a speed of 265 kt. around 80 seconds after takeoff, before descending to 1,475 ft. and accelerating to 330 kt. over the following 25 seconds. The aircraft subsequently resumed its climb to around 5,400 ft., where it remained for most of the remaining flight. Speed was relatively stable at around 300 kt.

    Lion Air, a fast-growing Indonesian-based LCC, said the aircraft was commanded by Bhavye Suneja, who had 6,000 flight hours, while the first officer, named only as Harvino, had 5,000 hours. The airline reportedly said there was a technical issue with the same aircraft on its previous flight, although it indicated this had been resolved. A statement from the airline said the aircraft was declared operationally ready
    . Lion’s CEO told media there were no plans to ground other aircraft.

    Lion Air operates 119 aircraft, predominantly 737-800s and -900s, with a total of 446 narrowbodies on order, including Airbus A320neo family aircraft. The airline is one of five Indonesian carriers listed on the IATA Operational Safety Audit (IOSA) registry, with its registration current through July 29, 2020.

    Boeing said it was “deeply saddened” by the loss of flight JT610 and “stands ready to provide technical assistance to the accident investigation,” and noted that “in accordance with international protocol, all inquiries about aviation accident investigations must be directed to the Indonesia’s National Transportation Safety Committee (NTSC).”

    All MAX aircraft are powered by CFM LEAP-1B engines.

    By: Adrian Schofield
    NS Comment: Souls on board reported as 188 or 189. Bodies and debris being recovered from the sea, as seen on the News.
    Condolences to the bereaved families of crewmembers and passengers.
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  2. #2
    Join Date
    Feb 2003
    Suki yaki

    Default Re: Lion Air 737 MAX Crash, Jakarta

    BBC News; Monday 05 November 2018
    Lion Air crash: Jet had airspeed problems on final four flights

    A passenger jet that crashed into the sea near Indonesia last week had an airspeed indicator problem on its final four flights, officials say.

    The damage to the device, which tells pilots how fast their planes are travelling, was revealed after the recovery of a "black box" recorder.

    Lion Air flight JT 610, carrying 189 people, crashed soon after taking off from Jakarta, the Indonesian capital.

    Airspeed is measured using sensors called pitot tubes, which record pressure on the wing or front surface of the aircraft. This is compared to pressure readings obtained from a so-called "static port" on another part of the aircraft. With corrections, the difference between the two can be used to calculate airspeed.

    Pitot tubes, however, can become blocked - for example due to icing. Such instances can cause erratic airspeed readings, which in turn can confuse pilots and affect the way in which the aircraft is flown, possibly leading to accidents.

    These are still early days in the investigation and more information is needed. But if unreliable airspeed readings were a factor, key questions will be: what was the cause - poor design or poor maintenance procedures, for example - and why previous problems were apparently not rectified.
    Full Report:

    NS Comment: The Pitot/static system design is well-proven, going back 50yrs on the B737. On the other hand, a repeated report of airspeed indicator issues should have warranted getting out the Pitot/static system Test Kit to checkout system integrity. Let's hope someone did that.
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  3. #3
    Join Date
    Feb 2003
    Suki yaki

    Default Re: Lion Air 737 MAX Crash, Jakarta

    NBC News; Wednesday 07 November 2018
    Boeing issues safety bulletin over 'angle of attack' sensors on 737 MAX after Lion Air crash

    Boeing issued a safety bulletin to pilots Tuesday instructing crews on how to handle the potential of erroneous data from sensors on its 737 MAX aircraft following of last week's deadly Lion Air crash in Indonesia.

    Indonesian National Transportation Safety Committee investigators looking at the crash of Lion Air Flight JT610 have found that one of the brand new plane's "angle of attack" sensors had malfunctioned and provided inaccurate data, according to Boeing.

    The sensor controls the angle of the nose of the plane relative to oncoming air. If the sensor fails to send correct information, it can confuse both the plane's computer and its pilots, causing an aircraft to take a sudden dive.

    The Lion Air plane hit the water 13 minutes after departing Jakarta at 6:20 a.m. last Monday. All 189 people on board were killed.

    The "angle of attack" sensors on the plane had been replaced the day before the fatal flight, The Associated Press reported. Additionally, airspeed indicators malfunctioned on the three flights leading up to Monday's crash, as well as during the last flight, Indonesian investigators have said.

    The Federal Aviation Administration will require all U.S. airlines that use the 737 MAX aircraft to follow the corrective actions laid out in the bulletin, the administration said. Two hundred of the planes are in use worldwide

    Boeing said the bulletin highlighted "existing flight crew procedures" on how to react to incorrect data being sent from sensors to the cockpit

    By Elisha Fieldstadt and Tom Costello
    Full Report:

    NS Comment: Looking like kneejerk reactions going on. Airspeed errors, AOA errors. If airspeed is lower than target, a stall may be initiated.

    Someone replaced the AOA Sensor. Not clear if the aircraft had one or two Stall Warning Systems. UK CAA Special Conditions required dual Stall Warning Systems on aircraft while the FARs used to specify a single system.

    Nothing mentioned yet if a Pitot/Static system check was performed for the Airspeed error snags.
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  4. #4
    Join Date
    Feb 2002
    The sandpit

    Default Re: Lion Air 737 MAX Crash, Jakarta

    This page has pictures of the final flight tech log entries at various stages of completion.

    The AOA sensors are used for SSEC which, if different between L&R, would certainly give altitude errors and possibly corresponding Airspeed errors too?
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  5. #5
    Join Date
    Feb 2003
    Suki yaki

    Default Re: Lion Air 737 MAX Crash, Jakarta

    Great input, Mono.

    The Tech Log pages don't say that the AOA was replaced, as previously given by the Indonesian investigators.

    A combined disagreement of IAS and ALT rather points to Static system issues, innit? The corrective action stated: Flushed and tested "on ground and found satisfied". The narrative didn't provide an AMM reference, so method of test is not definite.

    Should STS be Speed Trim System or Stab Trim System? With the Elev Feel problem, Stab Trim seems more likely to me.
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