KEYNOMEN AVIATION

About Certificates Pricing Log In

Keynomen Aviation

Home
About
Certificates
Pricing
Log In
Start Free

About Contact Pricing CFI Program Methodology

Terms of Service Privacy Policy Disclaimer

Keynomen Aviation is a study and reference tool, not flight training. Always check your POH, current FAA regulations, and with your flight instructor.

© 2026 Keynomen Aviation. All rights reserved.

uplock release cylinders — Aviation Definition | Keynomen Aviation

Words for: The Complex & Technically Advanced Airplane

← Back to The Complex & Technically Advanced Airplane

95 words in this area · Next word: forceful gear extension →

Sign up free to keep track of the words you’ve cleared.

uplock release cylinders

Plain English Meaning

Little powered pistons that pop open the latches holding the landing gear up inside the airplane, so the gear can drop down on its own when the normal system has failed.

Full Definition

Small hydraulic or pneumatic actuators that mechanically release the uplocks holding the landing gear in the retracted position, allowing the gear to fall free and extend by gravity when normal hydraulic pressure is unavailable.

Context Anchor

Seen in emergency landing gear extension procedures and system descriptions for retractable-gear airplanes.

uplock release cylinders

Next word: forceful gear extension →

Derivation

Uplock simply means the lock that holds the gear up. Release cylinders are small cylinder-shaped actuators that release something. Together: the cylinders that release the up-locks.

Why Pilots Care

These cylinders let the pilot extend the landing gear when hydraulic power is lost, reducing the chance of a gear-up landing.

Intuition Check

Do not assume these cylinders push the landing gear all the way down. Their main job is to release the locks that are holding the gear up.

Example Sentence 1

When the pilot activated the emergency extension handle, the uplock release cylinders unlocked the gear and it free-fell into the down position.

Example Sentence 2

During the preflight inspection the mechanic checked the uplock release cylinders for leaks to confirm they would work if needed.