Modern Prevention: Keeping the “Heart” of Your Machine Beating
By [Marc Arsenault, flight instructor, owner] Reading Time: 7 minutes
In [Part 1], we covered the paperwork mountain and the basic reality of maintenance. Today, we dive into the “art of prevention”. The difference between a reliable aircraft and a “money pit” that spends more time in the shop than in the air.
1. The Art of “Medical” Testing for Engines
To keep a modern engine healthy, you need to look where the naked eye cannot see.
- Oil Analysis: Many owners now use spectroscopic oil analysis. By sending a small sample to a lab, you get a microscopic breakdown of metal content. If one specific metal level spikes, you’ll know a component is failing before you see actual metal shavings in the filter.
- The Reusable Filter Revolution: Tired of the oily mess that comes with oil changes? Consider switching to a reusable oil filter. They offer superior filtration, don’t spill oil upon removal, and are much easier to inspect. In prime, you no longer throw anything away, and it contributes (according to announced specifications) to improving oil cooling.
2. Moving Beyond the “Woolly Mammoth” Era
In 2026, relying solely on old-school analog gauges is outdated. The “Engine Instruments… In the Green” checklist belongs to the era of the woolly mammoth.
A digital Engine Monitor is now indispensable. Your engine is worth tens of thousands of dollars; you need to know exactly what’s happening inside.
CHT: The Lifeblood of Your Engine
The lifespan of your engine is directly proportional to your Cylinder Head Temperatures (CHT). Modern data from thousands of engine monitors has debunked old myths. While “thermal shock” is rarely the culprit for cracked cylinders, the real killers are:
- High CHTs during climb.
- High power settings with poor mixture management.
- Detonation and pre-ignition.
- Operating consistently above 400°F.
Let’s be honest: can you really read an analog needle the size of a baseball bat with a 50-degree precision? That 50-degree gap is the difference between a healthy engine and a catastrophic failure.
Oil and Carburetor Health
While there is no legal minimum oil temperature for takeoff, it is highly recommended that the oil be at least 150°F. On the flip side, high oil temps degrade oil quality instantly.
Similarly, a carburetor thermometer should be mandatory. It provides an early warning of carburator icing that no pilot should fly without.
A Personal Story: Without my engine monitor, I would never have detected a complete fracture in the exhaust pipe of cylinder #2 of the right engine. In cruise, bizarrely, the EGT (Exhaust Gas Temp) dropped by 500°F. Once on the ground and the passengers gone, I opened the cowling to check “that damn faulty probe.” What a surprise: the fractured exhaust was blowing burning gases directly onto the cowling. Suddenly, the risk of fire had become very high.
3. High-Definition Inspections (for under $300)
The HD Borescope is the new frontier of prevention—once non-standard, but now at the forefront. This instrument often retails for less than $300.
Organizations like the FAA, AOPA, and private companies such as GAMI and Savvy Aviation enthusiastically promote visual cylinder inspections.
With a little practice and an online comparison chart, you can take excellent photos revealing the engine’s health. For example, you can spot a “burning” exhaust valve long before a compression test detects the problem. This allows for simple valve guide reaming instead of a full, invasive cylinder replacement.
4. The Best Maintenance is Flying
Mechanics will tell you over and over: Fly your airplane! Leaving an aircraft on the ground for prolonged periods does nothing good for the engine.
Combustion by-products are carbon dioxide (CO2) and water (H2O), along with corrosive acids. Leaving these in the engine long-term, even with oil, causes corrosion as the oil eventually drains into the sump.
- The 30-Minute Rule: Starting the engine on the ground is not enough to clear these substances. You must fly for about 30 minutes.
- The 190°F Target: Oil temperature must reach 190°F during this period to evaporate water accumulated inside.
- Pickling: If you won’t be flying for a few months, replacing standard oil with specialized storage oil is highly recommended. It’s more work. Compared to the cost of an engine overhaul due to a corroded camshaft, this prudence is fully justified.
5. Unscheduled Maintenance: The Survival Kit
Despite all efforts, “unscheduled” maintenance—the kind that wasn’t budgeted—will happen. A wheel assembly breaks because of a stone on a grass strip or a flat tire occurs in the middle of nowhere.
If you fly near airports with maintenance services, the “discomfort” is minimized. But aren’t planes meant to go far? After several lessons learned, I never leave without:
- A spare tire and tube.
- Two spare spark plugs.
- Basic tools and a 12V electric pump with its own battery.
- A lightweight lithium jump-starter.
For basic battery maintenance, I also recommend a specialized charger plugged in while parked.
6. The Reality of Canadian Winters
In our northern latitudes, flying in winter without a hangar is laborious. Between shoveling, de-icing the airframe and heating the oil, a one-hour flight becomes a half-day expedition.
The “law of least effort” means the engine often won’t turn for months. This is the perfect time for moisture to settle in. I highly recommend specialized wing covers and properly “hibernating” your engine. A little prevention goes a long way on the road of the unexpected.
Conclusion
Owning an airplane is indeed a struggle—a struggle of paperwork, technical vigilance, and financial surprises. But for those who engage with their machine, the reward is a level of safety and pride that renting can never provide.
Do you have any comments on owning your aircraft ? Please feel free to leave a comment.