Max talks about decision-making after experiencing a system failure in flight, especially those not explicitly covered in an aircraft’s Pilot Operating Handbook (POH). He discusses a generic procedure that pilots can use to assess the severity of a failure, how it affects the safety of flight, and what steps to take when dealing with a cascading series of malfunctions.
1. Assessing the Lost Capability
The first thing to evaluate in the event of a system failure is: what capability have we lost, and how does that loss impact the safety of flight? The severity of the failure could range from a minor inconvenience to a major threat to the safety of the flight. It’s essential to identify where the issue falls on this spectrum to prioritize the response. For instance, a loss of engine power is immediately dangerous and requires swift action, while a loss of a single sensor may not significantly impact flight safety.
2. Can You Substitute?
Pilots should also consider whether they can substitute something else for the lost capability. If there’s no direct replacement for a failed system, can secondary indicators be used to infer the aircraft’s state? For example, if you lose a primary engine sensor, other performance indicators might still give you an idea of how the engine is functioning.
3. Cascading Failures
A key point to consider is whether the failure could lead to a cascade of further problems. Some failures, like a turbocharger malfunction, might seem minor at first but can escalate into a more serious issue, like an engine fire. Pilots must be cautious with failures that could snowball into a larger problem, recognizing when it’s prudent to treat an issue as a full emergency rather than downplaying its potential risks.
Example of a Cascading Failure: Turbocharger Loss
Consider a scenario where the manifold pressure (MP) in a turbocharged aircraft starts to drop, seemingly reducing the aircraft’s performance to that of a non-turbocharged aircraft. While the initial reaction might be to assume the loss of MP is a minor inconvenience, in some cases, this could indicate a catastrophic failure in the turbocharger, such as a hot exhaust leak, which could lead to an engine fire. The cockpit instruments won’t distinguish between a benign or dangerous turbo failure, so it’s crucial to treat an unexplained MP loss as an emergency and land immediately.
4. Choosing Where to Land
The episode emphasizes that not all failures require an immediate landing at the nearest airport. In cases where you have time and the failure is less critical, it’s wise to evaluate where to land based on repair options and support services. For example, Cirrus owners are encouraged to carry a list of service centers, which can be a helpful tool when deciding on an airport to land at. Having such a list can influence your decision if you’re not under immediate pressure to land.
Comparing Different Aircraft Systems
The episode compares two popular general aviation aircraft: the Cirrus SR20/SR22 and the Diamond DA40NG, focusing on their electrical systems and the redundancies built into each. The Cirrus series, known for its dual alternators and dual batteries, is designed to maintain critical systems even after a significant electrical failure. For example, if both alternators fail, the Cirrus can still fly for over an hour on backup batteries, powering key avionics, including the autopilot. The engine, powered by magnetos, will continue to run even without electrical power.
By contrast, the Diamond DA40NG has less redundancy. It features a single alternator and battery, meaning a failure of the alternator eventually leads to a total loss of power, which will stop the engine. While the DA40NG does have backup batteries for the FADEC system (which controls the engine), the episode explains that in IMC conditions, a loss of the alternator is a much more stressful situation, as the pilot has less time to act before the electrical system is depleted, and the engine quits.
Importance of System Knowledge
Understanding the specifics of your aircraft’s systems is critical. Pilots must know what to expect from their plane during a failure, what backup systems are available, and how long they will last. This understanding can mean the difference between a well-managed emergency and an overwhelming crisis. For instance, in a Cirrus, even after both electrical systems fail, the engine continues running, giving the pilot time to make decisions and land safely. But in the DA40NG, failure of the electrical system will eventually result in engine failure, turning the aircraft into a glider.
Real-Life Example of System Failure
During a recent flight, Max experienced a failure of the engine sensors and electrical system sensors in a Cirrus. While this might alarm a pilot unfamiliar with the aircraft, it was manageable due to the built-in redundancies. The problem was traced to the failure of a line replaceable unit (LRU), which knocked out multiple sensors at once. Despite losing the ability to monitor the engine and electrical systems, the aircraft remained fully operational, underscoring the importance of system redundancy and knowing how to interpret and respond to such failures.
Key Takeaway
The central message of the episode is the importance of system knowledge, redundancy, and understanding the nature of different failures. Pilots must not only be proficient in flying the aircraft but also in managing its systems and understanding how failures might evolve. The advice to pilots is clear: prepare for the worst, know your aircraft’s systems inside and out, and always be ready to act decisively when something goes wrong.
Finally, the episode highlights the role of system design in determining how pilots respond to emergencies. Not all aircraft are created equal in terms of their ability to handle system failures, so pilots should factor this into their flying decisions and emergency planning.
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