Savvy has developed a groundbreaking new capability called FEVA™ (Failing Exhaust Valve Analytics) that, for aircraft equipped with a digital engine monitor, provides advance warning of the most common cause of in-flight cylinder shutdown: exhaust valve failure.

 A decade ago, Savvy’s founder and CEO Mike Busch discovered a characteristic pattern in exhaust gas temperature (EGT) data that is predictive of a failing exhaust valve. Until now, the pattern could only be detected by the eyes of a trained human analyst. But now, using sophisticated pattern recognition software, FEVA™ can detect the telltale signature of a failing exhaust valve automatically.

 The software has been developed and fine-tuned using Savvy’s database of over 600,000 separate flights that have been uploaded to the platform since its launch in early 2013. Backtesting against this database has demonstrated FEVA™ to be reliable in detecting failing exhaust valve signatures.

 FEVA™ is available to paid subscribers to SavvyAnalysis Pro, which costs $129 per year for singles and $199 for twins. The service also includes a regular program of professional analysis of subscribers’ engine monitor data: sign up now. Subscribers to the SavvyMx managed maintenance program also receive these services.  

Frequently Asked Questions

What is FEVA™?

Failing Exhaust Valve Analytics (FEVA™) is a new service included in every SavvyAnalysis Pro and SavvyMx subscription at no additional cost. FEVA™ automatically scans each flight you upload to the SavvyAnalysis platform looking for the telltale signature of a failing exhaust valve. If it detects one, you will receive an alert by email.

How does FEVA™ work?

Savvy's founder Mike Busch was the first to identify a characteristic pattern in exhaust gas temperature (EGT) data that is predictive of a failing exhaust valve. SavvyAnalysis analysts are trained to look for this signature every time a SavvyAnalysis Pro or SavvyMx client requests professional analysis of a flight. What our trained human analysts do with their eyes, FEVA™ now does automatically in software by means of highly sophisticated pattern recognition. This means that if you’re a SavvyAnalysis Pro or SavvyMx subscriber, ALL of your uploaded flights will be scanned, not just when you request analysis.

How do I get FEVA™?

All SavvyAnalysis Pro and SavvyMx subscribers receive FEVA™ automatically as a part of their subscriptions, and at no additional cost. SavvyAnalysis “Free” users can participate in FEVA™ by upgrading to SavvyAnalysis Pro.

How often should I upload my data for a FEVA™ check?

FEVA™ automatically scans every flight you upload. Uploading data regularly will ensure that you are alerted of a possibly failing valve sooner rather than later. We recommend uploading your engine monitor data at least monthly. The more often, the better.


What happens when FEVA™ detects a failing exhaust valve?

During the first stage of FEVA™ deployment, any time FEVA™ indicates a possibly failing valve one of our trained analysts will be alerted and will visually review the engine monitor data for the flight flagged by FEVA. If our human analyst concurs that the failing exhaust valve signature is present, a ticket will be opened and you will be notified by email. We encourage you to have the suspect failing valve borescoped by a technician skilled in borescopy to confirm that the valve is indeed failing. We will also ask that you notify us of the borescope findings, and if possible send us the borescope images so that we can continue to fine-tune FEVA™. In later stages of FEVA™ deployment, SavvyAnalysis Pro and SavvyMx subscribers will receive immediate automatic notification whenever they upload a flight that is flagged by FEVA™. Our SavvyAnalysis team will also be notified, and will follow up as described previously.

How thoroughly has FEVA™ been tested?

We have been developing FEVA™ for about six months, fine-tuning the detection criteria using our database of about 600,000 flights. Based on this backtesting, we now believe FEVA™ is reliable enough for us to invite our SavvyAnalysis Pro and SavvyMx clients to participate in the first phase of deployment. We expect the next phase of FEVA deployment to occur in the Fall of 2014. However, we never expect FEVA™ to be “finished”—we will continue to refine it based on the data we obtain from our clients. That is why it is so important for clients to have any FEVA™-positive cylinder borescoped, and share the results of the borescope inspection with Savvy.

What engines does FEVA™ work with?

The underlying principle behind FEVA™ is applicable to all four-cycle aircraft engines with exhaust valves equipped with rotator caps. This includes all horizontally-opposed Continental and Lycoming engines.

What engine monitors does FEVA™ work with? 

FEVA™ requires a digital engine monitor that records EGT individually for each cylinder. The good news is that virtually all engine monitors do. It requires a data sampling rate of at least 10 samples per minute; the higher, the better. At present, FEVA™ is calibrated to work only with engine monitors which record EGT in degrees F. We plan to add degrees C.

Is it possible to get real-time FEVA™ alerts in the cockpit?

Not at the present time. But we do expect that engine monitors will contain real-time analytic capability in the future.

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