Depends on aircraft, type of approach,approach limits, airline rules etc. If the PIC feels he will not be able to land safely, he will throttle up and go around. The pilot not flying will call ATC to tell them. With big aircraft it takes a small amount of time to get full power to climb again. Sometimes you will an aircraft touchdown before going around.
Fighter jets are at full throttle upon landing in case the hook does not get hooked. Airliners idle back on flare.
#avgeek
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