Final answer:
The subject of this question is Physics, specifically power settings and engine fuel flow in aviation. An ILS approach requires a fuel flow of approximately 4,500 PPH per engine.
Step-by-step explanation:
The subject of this question is Physics. Specifically, it is about power settings and engine fuel flow in the context of aviation.
An ILS (Instrument Landing System) approach typically requires a power setting of approximately 4,500 pounds per hour (PPH) of fuel flow per engine. This information is relevant in aviation and aeronautical engineering.