Infant Mortality

17 April 2026

The Hidden Risk of the "Zero-Time" Component

The Counter-Intuitive Nature of Aviation Maintenance

To the conscientious owner-pilot, there is a certain peace of mind that comes with seeing a brand-new component installed under the cowling. We often equate "new" with "reliable" and "old" with "risky." However, if we look at the data-driven world of Reliability-Centered Maintenance (RCM), we find a reality that is somewhat counter-intuitive: a component is often at its highest risk of failure when it is brand new.

In professional maintenance circles, this is often referred to as Infant Mortality.

Understanding the Bathtub Curve

Reliability is rarely a straight line; instead, it follows what engineers call the "Bathtub Curve." When a part is first manufactured and installed, there is a brief but distinct period where the probability of failure is elevated.

This isn't necessarily because the part was poorly made, but because it has not yet been "stressed" by the unique environment of the airplane. Manufacturing defects, material impurities, or even a slight installation error, tend to reveal themselves within the first few hours of operation. Once a component survives this initial "burn-in" phase, it enters a long, stable period of maturity where its reliability is at its peak.

The Value of the Proven Part

As your partner in aircraft maintenance, we encourage owners to reconsider "preventative" replacements of healthy components. If a starter, solenoid, sensor, or other component has several hundred hours of flawless operation, it has likely moved past the infant mortality stage and proven its integrity. By replacing a perfectly healthy, mid-time part with a brand-new one, you may actually be resetting the clock and moving your aircraft back into that initial window of higher risk.

Mitigating the Risk

When a replacement is necessary, we don't simply install and sign off. We manage infant mortality through:

• Rigorous Ground Testing: We perform proper ground runs to ensure that any initial defects are caught on the ramp where the inconvenience the merely additional down time.

• Data Monitoring: We use engine monitors to look for subtle "early warnings" that a new component isn't settling in as it should.

• Precision Installation: By "working smart" and following exact torque and clearance specifications, we mitigate the human variables that contribute to early failures.

The Coastal Perspective

At Coastal Aircraft Services, our philosophy is rooted in the belief that 100% compliance with safety standards is the only path to true reliability. We treat every new part with a degree of professional skepticism until it has earned its keep through performance. Our goal is never to rush a plane back into the sky, but to ensure that when it does depart, it does so with a proven, stable, and safe configuration. True excellence in maintenance is found in the discipline of knowing when to intervene and, more importantly, when to let a healthy component keep flying.

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