I used to be an airplanes and airports guy, in a former life. With my undying need to be right, I offer the following:
-1 SJO, runway is nearly 10,000 feet long and the airport elevation aprox 3,500'. Depending on barometric pressure, that is enough runway for even the largest jets. I don't know if the landing surface is properly stressed for the landing weight of a mega-jet however. We once had an AN-226 (Russian huge cargo job) land and turn of the runway in 3000'.
-2 The ALS (Approach Lighting System) is a visual aid to landing that is a part of the ILS (Instrument Landing System). When the ALS is out of service, it raises the landing minimum for commercial operators. If the weather minimum for an aircraft was 700' ceiling and one mile visibility with the entire system operating, it might change to 1100' ceiling and 1 1/2 miles visibility if the ALS is out. I haven't checked the minimums here, the numbers above are an example. What it means to the passenger is that the aircraft must divert if the weather is not at the appropriate minimums when it is time to shoot the approach. Welcome to Panama.
In my formerly professional opinion, SJO is as safe an airport as any and safer than many. The killer is the embedded thunderstorm and the associated up/down drafts caused by the micro-bursts that flow downward from a dissipating cumulonimbus cloud (thunderhead). Imagine air flowing straight down like pouring piss from a boot. When it hits the surface, it moves laterally in all directions just like the piss when it hits a flat rock. As an aircraft on approach flies through the micro-burst, the pilot first picks up a strong headwind and increases power. As he hits the center of the burst, the aircraft is thrust downward and more power is applied or the aircraft is reconfigured to compensate. Just as the aircraft comes into full control, the pilot picks up a strong tailwind and his speed increases. Now he retards the throttles to try to stay on profile. Just as he gets the aircraft slowed, the tailwind disappears and he is left with not enough power and, too often, not enough altitude. It takes a moment after throttles are pushed forward for the jet engine to make power.
Micro-bursts from thunder cells can also lead to severe crosswinds on landing or down drafts on short final. Flying in the vicinity of cumulonimbus clouds can be a killer. Often the short-landings and crashes by overshoot are the result of the dramatic changes in wind direction and speed associated with these massive clouds.
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Disclaimer: The above is merely the opinion of the author unless specific scientific data is included.
Your mileage may vary.
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