Slow leaks can be tough to catch during a preflight inspection. Most liquid filled containers are hidden behind the engine cowl or wheel wells. But if you pay attention to changes on the ground you can catch small leaks before they become major trouble.
What Can the Ground Tell You?
Key Takeaways:
- Preflight ground inspection is crucial for detecting slow leaks (oil, hydraulic, fuel) and fallen components that may be difficult to spot directly on the aircraft.
- The color of ground stains helps identify the type of fluid: red indicates hydraulic fluid, dark and sticky points to oil, while clear or light blue stains (especially under wings) suggest fuel.
- Small oil stains should be monitored for growth, while grease on propeller blades signifies a propeller governor leak needing attention.
- Beyond leaks, ground inspection can also reveal missing bolts or nuts that have fallen from the aircraft.
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