ATC will often ask pilots if they can do something somewhat out of the ordinary for the purpose of granting a shortcut or maybe to gain that extra slice of airspace. This subtle word works on both sides of the coin. In the pattern, Tower might ask a pilot to fly a short approach that-if the pilot is unprepared and accepts it-requires a steep and fast dive. Perhaps youve been offered that so they can fit you inside of other traffic, to avoid vectoring you 10 miles out to get behind everyone. Or, perhaps they just need you to cross the approach end of the runway so they can start getting other airplanes out. Regardless, if you dont think you can safely and properly comply, bring on the PIC authority and just say it, Unable.
"Unable" is a critical word in aviation communication, used by both pilots and air traffic controllers to indicate non-compliance with an instruction or request due to safety, capability, or operational limits.
Pilots, exercising their Pilot in Command (PIC) authority, must assert "Unable" without hesitation when an instruction compromises safety or exceeds their capabilities, prioritizing safe flight operation.
It is important to use "Unable" judiciously and, when possible, provide a concise reason to help controllers offer alternative solutions, as failing to assert it can lead to dangerous situations.
How often has ATC asked or maybe even told you to do something that was just not inside your capabilities or safety limits? A few times? Maybe you are an airline pilot and it happens somewhat often. What about when you requested a short cut or something other than normal?
There are many cases on both sides of the mic where saying, “Unable” is the best thing to do.
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