Paul McBride, an expert on engines, retired after almost 40 years with Lycoming.
Q: Here is my mystery: I have a Geronimo Apache equipped with 0-360-A1As. The left engine is about 1,200 SMOH, the right engine is about 700 SMOH. They both had oil pressure of 85 psi in cruise and about 50 psi taxiing in after a flight. At about 1,150 SMOH, the LE began to show low oil pressure. It slowly, over about 20 hours, started dropping in cruise from about 85 psi to about 65 psi and down to 30-35 psi taxiing in. I thought bottom end bearings. [Read more...]