With any modern, hi-bypass, turbo fan engine today, there should never be a reason to be close to the engine during hi-power operations. The danger areas (both intake and exhaust) would prevent you from getting close enough to carry out any maintenance safely. Some procedures require you to carry out maintenance at idle power but if this is necessary, any sensible engineer-in-charge will have briefed all their staff on safe access corridors before the run starts. Unfortunately, it is too easy to get distracted or forget these procedures in the middle of a noisy engine run. It is a very stressful environment and only experience and common sense can prevent these accidents.