Aircraft Piston Engine Troubleshooting , This is the first and most important principle. A common mistake is to rely on unclear or vague descriptions of the symptom. The best way to get a good read on the symptom is to experience it yourself. Do your best to emulate the same conditions and duplicate the problem. The person experiencing the symptom, usually the pilot, needs clear and definite instructions to troubleshoot when the symptom occurs again (provided safety of flight is not compromised). DIAGNOSIS At this point, sit down with your systems knowledge (whatever the source) and go through the system operation step by step. Note which component and situation would cause the symptoms you’re experiencing. List these possible causes and move to the next step. Common problems : 1. NO START/HARD STARTING: There are three requirements to get an engine to start — fuel (in the right propor- tion), oxygen (air), and fire (timed spark). If the engine won’t run, one of these things is missing. Another common problem encountered is magneto timing. If the engine has just shown up from the overhaul shop or maintenance has just been performed on the magneto, look for these symptoms and their source problems. 5. LOW OIL PRESSURE: The three most important factors that determine oil pressure in any given engine are: oil pump volume, engine internal clearances/leakage, and oil viscosity. The two most common causes of this symptom are oil viscosity and internal clearances/leakage…..

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