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Runaway Stabilizer!! How to stop MCAS.

Mentour Pilot · explainer · Watch on YouTube

Aviation & aerospace engineering

What it is

A Boeing 737 pilot explains the runaway stabilizer checklist, the procedure for stopping unwanted horizontal stabilizer movement such as an MCAS activation on the 737 MAX. He walks through the steps, the trim cutout switches and the jackscrew mechanism, and shows a simulator run including the manual trim wheel effort.

Why Hacker News recommends it

During the 737 MAX crash coverage, HN commenters linked it as a clear, pilot-led demonstration of what an MCAS runaway looks like and how hard manual trim is to crank.

  • 7 people recommended it
  • 3 different months
  • 4 strong recommendations
  • first 2019, last 2022

What HN commenters said

  1. “I highly recommend everyone suggestion engineering solutions to watch this video”

    Real pilot performs runaway stabilizer procedure in simulator.

    exabrial, 2019-03 · Strong recommendation · in “Where Boeing’s 737 Max Planes Go When They’re Grounded”

  2. “I'd highly recommend anyone who wants to see what an MCAS runaway looks like”

    Shows MCAS runaway, troubleshooting steps, and simulated failure.

    Declanomous, 2019-03 · Strong recommendation · in “No call for simulators in new Boeing 737 Max training proposals”

  3. “A very eye-opening thing is to watch what the pilots should have done”

    Eye-opening view of what pilots should have done.

    pas, 2019-04 · Strong recommendation · in ““I worked at Boeing for about 1.5 years in the 2008-9 time period””

  4. “I'd highly recommend Mentour Pilot's videos on the subject”

    Videos explaining MCAS and trim cutout switches.

    Zancarius, 2019-05 · Strong recommendation · in “Long Before Boeing 737 Max Crash, Ethiopian Air Pilot Warned of Dangers”

  5. “Even better”

    Educational look at the automatic trim system.

    sundvor, 2019-04 · Recommendation · in “Ethiopian Airlines Boeing 737 pilots 'could not stop nosedive'”

  6. “explains the stabilizer system quite well”

    Explains the stabilizer system and trim wheel loading.

    proctor, 2019-04 · Recommendation · in “Ethiopian Airlines 737 MAX Investigation Preliminary Report”

  7. “Here is a good video by an actual 737 captain explaining how the runaway stab trim procedure works”

    737 captain explains how runaway stab trim procedure works.

    janoc, 2019-05 · Recommendation · in “Ethiopian Max Crash Simulator Scenario Stuns Pilots”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: mcas, boeing 737 max, runaway stabilizer, aviation safety, simulator

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