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Boeing 737 Unable to Trim!! Cockpit video (Full flight sim)

Mentour Pilot · 369.5K views · 2019-04-19 · 24:08

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Overview

Mentour Pilot, a 737 captain, demonstrates in a full flight simulator why a Boeing 737 can become impossible to trim manually at high speed. He explains the jackscrew forces and the roller-coaster manoeuvre.

On Hacker News

HN pointed to it during the 737 MAX discussions to show how hard manual trim is when severely out of trim.

Recommended by 3 HN people across 2 months · HN mentions 2019–2022

Topics

Aviation & aerospace engineering
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boeing 737737 maxmcasflight simulatorstabilizer trim

What people said

jcalvinowens · 2022-02 · Recommendation

> ... it can become impossible for a pilot to physically turn the manual trim wheels to get back into trim I feel like this isn't talked about enough. I had no idea how bad it can actually get: [VIDEO]

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janoc · 2019-05 · Recommendation

Well, the "Stabilizer wheel - grasp and hold" item of the procedure doesn't necessarily mean the crew will be able to override it. That's the last ditch option on the checklist, when everything else has failed, even turning the motors off (there could be e.g. a short circuit powering the motor). There is no clutch on the 737, AFAIK, because the forces are such that it wouldn't work. Here is a good video by an actual 737 captain explaining how the runaway stab trim procedure works and what you have to do. [LINK] And this simulator video shows both how the 737 horizontal stabilizer is controlled and what kind of forces are on the trim wheel and control column when severely out of trim: [VIDEO] Should give you an idea what were the Ethiopian pilots facing when unable to use the electric trim, plane trimmed nose heavy by MCAS and at high speed ...

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janoc · 2019-05 · Recommendation

This video by a 737-NG captain shows the kind of forces you get: [VIDEO] It is not MAX but the systems are identical. That's why it is so essential to recognize and stop the runaway trim (for whatever reason) ASAP or you could get into a situation where it would be physically impossible for the crew to do so.

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Sources

Video by Mentour Pilot, played through YouTube.

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