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Aircraft Engine Oil Checks

This months accident easily could have resulted from perhaps the most insidious preflight challenges: interruptions. Being interrupted in the middle of, say, refueling or checking the engine oil can have severe consequences. The trick for me always has been to start over after the interruption is resolved. If this means leaving passengers in the FBO lobby until Im ready, or missing a clearance void time, so be it. If it means answers to a passengers questions must be postponed, thats okay, too. Interruptions during a preflight inspection are insidious because they allow us to consider a task complete when it isnt. Well never know if an interruption during the preflight inspection helped cause this months accident, but its as good an explanation as any.

Gemini Sparkle

Key Takeaways:

  • Pilots frequently become complacent with routine preflight inspections, especially on familiar aircraft, often abbreviating critical checks due to familiarity or the perceived importance of the mission.
  • Interrupting a pilot during crucial preflight tasks, such as checking engine oil, poses a significant and insidious risk, as it can lead to tasks being considered complete when they are not, with potentially severe consequences.
  • An accident detailed in the article highlights these dangers, where a pilot died due to engine failure caused by an uninstalled oil filler cap, leading to oil exhaustion; the pilot's underlying medical condition also exacerbated his recovery and ultimately contributed to his death.
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If one spends enough time flying personal airplanes, what once was new and novel eventually becomes normal. Preflight inspection tasks like wiggling control surfaces, sampling fuel and checking the engine meet this test. In addition to verifying the paperwork, checking weather and TFRs, and a general walk-around, these tasks are the ones we (should) perform before each flight.

But familiarity breeds contempt, and I’d be willing to bet someone out there has a bell curve demonstrating the effectiveness of a preflight inspection peaks around the time we earn our private certificate. When we’re still a student, part of the curriculum includes how to conduct a preflight inspection, what to examine and how. After that, we’re on our own for the most part, and often abbreviate our preflight inspection of aircraft with which we’re familiar. It’s not the smartest thing, but we do it anyway

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