No, we can't expression any negative value as a probability. A probability ranges from 0 to 1 - 0 being the lowest and 1 being the highest.
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useing a punnett square shows two ways to express probability
What is the probability of rolling an even with one roll of a numbers cube.
percentage, decimal, fraction
You express it as a number in the interval [0, 1] or, equivalently, as a percentage in the range [0%, 100%].
Assuming the alternator's failures are unrelated, the probability of both failing is the product of the individual probability, or 0.022, or 0.0004. The duration of the flight does not matter.