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     1. 08:04 AM - Yak-50 main landing gear slam-down (apatton2)
 
 
 

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Time: 
08:04:05 AM PST US
Subject: 
Yak-50 main landing gear slam-down
From: 
"apatton2" <apatton@alumni.princeton.edu>
      
      
      Hi List,
      I have been having an intermittent issue with my right main landing gear on extension.
      
      
      Here's what we have done to get the overall system in shape:
      - removed the cleaned the main landing gear actuators for corrosion. The air system
      is gratifyingly tight at the moment.
      - Installed new chevron seals in the actuators
      - Cleaned shuttle valves and replaced rubber balls inside the valve
      - Removed mechanical uplock, cleaned, and lubricated
      
      Retraction is normal. We have been unable to reproduce this on jacks, and it's
      unpredictable in the air.
      
      The problem, when it occurs: the left MLG has normal extension. Nothing seems to
      happen on the right side (red lights go out). Then, after about 3 seconds, the
      gear slams down so hard that it "bounces" into the lock position (the green
      light blinks momentarily).
      
      Any thoughts on what is happening here or how to better diagnose? We did 6 cycles
      on jacks with perfect (simultaneous) extension before giving up.
      
      Many thanks,
      Andrew
      
      --------
      Andrew Patton
      Yak-50
      San Francisco, CA
      
      
      Read this topic online here:
      
      http://forums.matronics.com/viewtopic.php?p=515314#515314
      
      








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