Thu, Jun 18, 2009
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."
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