Main Landing Gear Retraction Test

I finally received the main landing gear hydraulic cylinder from the factory, over a year late.  It was installed in the keel tunnel and the retraction cables were attached to the MLG over-center mechanism.  Instead of hooking up the hydraulic pump, I decided to use nitrogen to test the retraction.  There is a stored energy problem with using gas, so I was very careful to manually help the retraction through the portions that required the most pressure.  I found that the over-center lock bar disengaged at about 380 psi, but it only required about 100 psi to hold the MLG in the retracted (up) position.

Author: bzvelocity

Building a Velocity XLRG-5

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