.... operator not checking the tyre pressure, which led to all four main gear tyres rupturing at just above V1 speed.
So we have four tyres destroyed, then ....
Investigators found that the Learjet's tyres, which are supposed to be inflated to 15.1bar (219lb/in2), had progressively lost about 2% of their pressure a day over a period of about three weeks before the accident, a typical leak rate for high-pressure tyres. Federal Aviation Administration certification rules allow for the tyres to lose as much as 5% a day.
........ followed by ............
Investigators determined that the tyres on the accident aircraft were inflated to about 9.66bar, 36% below the optimum pressure and well below the point at which they must be changed because of heat damage.
Eh? That's some pretty fancy accident investigation.
