Yes - if there is 50% margin then the output should be fine until the guts come loose. If it has 5% margin, just getting some buildup might push it over the edge.
Example: monitoring could tell that the output is down 3% and knowing they stop being helpful at a loss of 5% so replace it before the next Atlantic flight. Or the oil temp is too high or fuel consumption has gone up or some other factor that is predictive.