I've been studying Figures 5 and 7 of the Lion Air interim report and cannot understand why the airplane was dispatched on the "Loss-of-control" flight when the Left stick-shaker was on throughout the entire previous flight (Figure 7). Can this occur in normal operations everywhere?
I have no experience with ground operations (just 35 years with design of flight control equipment), so I'm asking the airline folks here. (I understand that often multiple causes lead to a crash, so I'm looking for understanding, not blame.)

Data Recorder chart from Lion Air flight prior to 610

  • 3
    $\begingroup$ I'm voting to close this question as off-topic because it discusses an accident that is still under investigation. $\endgroup$
    – Vikki
    Mar 25, 2019 at 3:50
  • $\begingroup$ Why is the AoA constant during climb and descent? $\endgroup$
    – Pheric
    Mar 25, 2019 at 4:45
  • 1
    $\begingroup$ @Pheric in any non-accelerated flight situation (basically everything except initiating and ending a climb or descent, and turning) the AoA is only a function of airspeed, mass, flap deflection and air density. Since these factors remain roughly constant for most of climb and descent, so does the AoA. $\endgroup$
    – Felix L.
    Mar 25, 2019 at 19:04

1 Answer 1


Well, if the shaker was running abnormally like that, the crew would have done a QRH procedure, if any, for that condition, and reported the snag at the next stop, and something would have been done by maintenance to release the plane. Like a part was changed, or the problem went away and couldn't be duplicated after a test was done on the ground, whatever was required to get a maintenance release. It would have to have been released as serviceable, one way or another.

  • $\begingroup$ Very clear answer! You just taught me about QRH and I spotted a description at What exactly is a QRH Thanks. $\endgroup$ Mar 25, 2019 at 4:43

Not the answer you're looking for? Browse other questions tagged .