On June 27 a Scweizer 269D made a hard landing after an engine failure. The Investigation reveiled a broken Pc line (compressor discharge pressure senseline to fuel control). Problem was probably too much tension on the line due to the fact that it misaligned. Misalignment of this line is not uncommon, but enough misalignment in conjunction with excessive vibration could result in a broken line. Rolls Royce has issued CSL A-1166 which advises to install the line without tension due to misalignment. Some extensive bending could be required!