Nick, Vlift is correct about the 269, although perhaps he should have said "improperly serviced oleos".
Here's a link to an NTSB report on the destruction of a Schweizer 300C (based on the 269) due to ground resonance, that had improper pressures in the skid dampers.
http://www.ntsb.gov/ntsb/brief.asp?e...07X03924&key=1