NOD
I have flown out of LHR as main base for nearly 20 years with 2 large operators. Not once has the matter been raised (nor at other similar airfields near cities) in training, publications nor pre-flight emergency briefs at routing clear of built up areas.
It might be a valid question to ask, but if it becomes unacceptable, it basically means LHR is unacceptable as an airport. Unless we develop a special MEL type document for each airport / approach specifiying minimum required equipment (all engines & cowlings fitted / working ) that applies even in emergency I cannot see any progress?
Completely impractical, almost every major airport in the world is surrounded by a built up area, maybe we should start only operating aircraft with 6 engines just in case 4 might fail at the same time
But using that logic it would mean 6 times as many cowling fasteners to miss being locked at some point, it's happened before and it will happen again so long as management continue to cut corners and bean counters continue to cut costs.