The Air Current

In the era of deep fakes, hacked and forged documents, impersonations and phishing attacks, an eye of skepticism is an essential digital tool in the modern media era.

Lion Air 610’s crash off the coast near Jakarta on Monday morning (local time) has sparked the requisite investigation to find the cause of the first accident involving a recently-delivered Boeing 737 Max 8. Almost immediately, documents began circulating in the aviation community that appeared to be a page from the airline’s Aircraft Flight & Maintenance Log from the flight that immediately preceded JT610.

The first version document that shared with The Air Current appears to detail the trip from Denpasar to Jakarta aboard the three-month old PK-LQP. The image’s annotations point to an altitude disagreement seen by the crew just after takeoff, but the hand drawn blue circles obscure key parts of the document. Simply put, an inadvertently redacted document doesn’t give the full picture of the aircraft’s most recent maintenance.

A second version of the same image was reviewed by The Air Current several hours after the crash. This one lacks the annotations, providing a clearer view of the “discrepancies/malfunctions” column of the page. JT43 experienced both and airspeed and and altitude disagreement after it left Denpasar and the crew witnessed the illumination of the “FEEL DIFF PRESS LIGHT” indication, which lights up if it senses a difference in pressure from A and B system to the Elevator Feel and Centering Unit and can reflect a change in the normal controllability of the aircraft. According to Flightradar24 tracking, JT43 made the trip at 28,000 feet.

NOTE: Explanation of FEEL DIFF PRESS has been updated.

Now, a third version of the log has surfaced. This one includes all the elements of the second, but the document was photographed displayed on another screen, a curved-edge mobile phone. UPDATE: A higher-resolution version of the third version of the log document has been uploaded here and reflected in the description below.

The handwriting and signatures match the first two documents, but it now includes a filled out corrective action section  and an attached narrative of JT43 appended to the shared image. STS system identified here is the Speed Trim System.1

A: PK LQP, B737 Max 8
D: 28.10.2018
O: Airspeed unreliable and altitude disagree shown after take off. STS was also running to the wrong direction, suspected because of speed difference. Identified that CAPT instrument was unreliable and handover control to FO. Continue Non normal checklist of Airspeed Unreliable and Altitude disagree. Decide to continue flying to CGK at FL280, landed safely rwy 25L
R: DPS CGK LNI 043
E: AFML

This narrative from JT43 isn’t actually written on the document, which appears to detail what maintenance actions were performed on the LH pitot and static air data modules. A higher-resolution version of the document circulating lists the corrective action taken on the air data module (ADM), which was flushed and was tested “on ground found satisfied.” A second test of the elevator feel computer was tested and “found ok.” as well.

The air data system will no doubt be a focus of the crash, but social media has presented users with three versions of the same document at three different states of modification. As the investigation gets rolling in Indonesia and the aircraft maintenance logs from JT43 and other earlier flights are scrutinized, there is a real peril of drawing speculative conclusions or forming narratives with leaked documents that appear to change with every additional round of sharing.

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Jon Ostrower is Editor-in-chief of The Air Current. Prior to launching TAC in June 2018, Ostrower served as Aviation Editor for CNN Worldwide, guiding the network's global coverage of the business and operations of flying. Ostrower joined CNN in 2016 following four and half years at the Wall Street Journal. Based first in Chicago and then in Washington, D.C. he covered Boeing, aviation safety and the business of global aerospace. Before that, Ostrower was editor of the award-winning FlightBlogger for Flightglobal and Flight International Magazine covering the development of the Boeing 787 Dreamliner and other new aircraft programs from 2007 to 2012. Ostrower, a Boston native, graduated from The George Washington University's School of Media and Public Affairs with a bachelor's degree in Political Communication. He is based in Seattle.

View Comments

  • You don’t seem to understand the defect notification and rectification process used in modern aviation. Nor should you I guess but then why write about it as if you do?


  • AnnonymousAnnonymous

    Author Reply

    How can a maintenance release AT DENPASAR contains information AFTER airplane took off from Denpasar heading for Jakarta? Doubt the document in picture is genuine


  • CloudmanCloudman

    Author Reply

    The aircraft was released at DPS and landed at CGK. Then the crew/captain wrote in the two defects, then engineering did the rectification. All looks above board to me. The three images were obviously simply taken at different times as the process advanced.


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