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Thu, Jun 18, 2009

FAA Safety Alert Focuses On Tire Pressure

Basic Item May Have Caused A Fatal Crash

While this particular Safety Alert For Operators stemmed from a fatal accident involving a Learjet Model 60, it's good advice for us all. And it's more critical than improving gas mileage. This SAFO emphasizes the necessity for operators of all aircraft, and especially the Learjet Model 60, to maintain the correct tire pressure. This is done by checking cold tire pressure at the intervals recommended by the manufacturer.

On September 19 of last year, a Learjet Model 60 departing the Columbia South Carolina Airport overran the runway when the crew attempted to reject the takeoff. The two crewmembers and two of the four passengers were fatally injured, the other two passengers suffered serious injuries. The aircraft was destroyed by extensive post-crash fire. The initial investigation revealed tire debris and portions of the airplane’s components on the runway. It is possible that low tire pressure could have led to a tire failure.

The tires on the Lear Model 60 are designed to carry heavy loads at high speeds. Problems caused by incorrect tire pressure can lead to catastrophic failure of the tire(s). Over inflation of a tire can cause uneven tread wear, reduced traction, make the tread more susceptible to cutting, and can increase the stress on aircraft wheels. Under inflation of a tire can cause uneven tire wear and greatly increases stress and flex heating in the tire, which shortens tire life and can lead to tire blowouts.

It is imperative pilots understand the dangers of improperly inflated tires. Pressure checks of tires are most meaningful at ambient temperature when tires have been at rest for at least two hours since their last use. When tire pressure is checked with a gauge, the gauge must be calibrated.

The FAA recommends all pilots become familiar with this SAFO, and be sure to check tire pressure as recommended. In other words, don't just "kick the tires and light the fires."

FMI: www.faa.gov

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