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Strut Seal Problems

ABS Full Member
Posts: 7

My right main strut keeps blowing the seal. Seams like in past it may have been caused by a rolling O-ring. We are on a third try now. It appears that tolerances are within spec on the plating of the strut. No scars or visible imperfections... any ideas about what else may be going wrong? I am the pilot, not a mechanic. I can't be certain about this, perhaps coincidental, but I did have a pretty good crosswind landing with a slight drift / lateral load on gear, on touchdown price to the last failure. Not bad, have definitely done worse. Could that have played a roll in this mystery?

Posted 4/25/2019 - 3 months ago
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Replies

ABS Full Member
Posts: 536

You did not state what type of aircraft you have.
Depending on the age and hours on the aircraft, the bearings in the strut housing may be worn and allowing the strut to shift around in the housing and breaking the seal which allows the fluid to leak
Take a look at the maintenance manual for your model and it will provide the tolerance allowed.
You can also call Delta Strut in Fresno, CA 559-441-1316

Bob Ripley
ABS Senior Technical Advisor

Posted 4/25/2019 - 3 months ago
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ABS Full Member
Posts: 236

Also, depending on model and serial number, many struts have the seal between 2 teflon back-up rings (some have only one). If the seal is not between them, or on the wrong side of the one (in cases where only one is installed) then the "O" ring does not have the proper support, and could leak.

Posted 4/25/2019 - 3 months ago
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ABS Full Member
Posts: 7

Thank you both. The plane is a '67 V35TC. Your suggestion is the most material idea that has been tossed around yet. Coincidentally, between my post and your replies we did contact Delta and they said the same thing. The strut is heading their way now. Again thank You.

Posted 4/25/2019 - 3 months ago
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Strut Seal Problems