When a Philippine-registered aircraft is flying over Malaysia on its way to India, which law regarding aircraft operations should the crew follow?

In the scenario where a Philippine-registered aircraft is flying over Malaysia, the crew is obligated to adhere to the laws and regulations of the airspace it is currently operating within, which is Malaysia in this case. Each country maintains the authority over the airspace within its borders, making national regulations applicable to all aircraft operating in that airspace, regardless of the aircraft's registration.

Malaysian regulations govern the procedures, safety standards, and operational limits for aircraft in its airspace, ensuring compliance with safety and operational protocols. Therefore, the crew must follow Malaysian regulations while the aircraft is flying over that region, as they dictate how to deal with air traffic control, navigation, and other relevant operational norms specific to Malaysian airspace.

Other options such as India's regulation and PCAR (Philippine Civil Aviation Regulations) do not apply in this situation, as those regulations pertain to their respective jurisdictions and would not govern the aircraft while it is mid-flight over Malaysia. Similarly, FAR (Federal Aviation Regulations) relate to the United States and do not apply to an aircraft operating in Malaysian airspace. The key factor is the principle of sovereignty over airspace, which dictates that the regulations of the country currently being traversed must be followed.