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![airmainengineer Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1169088148745400320.png) aircraftmaintenancengineer [@airmainengineer](/creator/twitter/airmainengineer) on x 32.2K followers
Created: 2025-07-14 16:30:00 UTC

Today’s reel dives into the Boeing XXX horizontal stabilizer trim system. It’s a big one, hope you enjoy it!

You guys liked the A321 version I posted, so here’s the XXX take:
This system is cable-driven with electric motors, and you can manually trim using the trim wheels in case of failure. There’s a drum under the cockpit and another one on the actuator itself. Don't forget to close the handle on the control wheel if you're trimming electrically, it will hurt 🤣.

Quite different from the Airbus family: while they also use cables, it's only for position feedback, movement is fully hydraulic via three systems. No hydraulics? No trim. But a complete failure of the hydraulic on the Airbus family is highly improbable.

📸 by ig/only_fancowl . Go follow him for more aviation content ✈️

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