Final answer:
The minimum N2 and oil pressure required before turning the ENG SHUTOFF SWITCH on can vary depending on the engine type and manufacturer.
Step-by-step explanation:
The minimum N2 and oil pressure required before turning the ENG SHUTOFF SWITCH on differ based on the specific engine type and manufacturer.
However, as a general guideline, it is recommended to have the N2 RPM (rotating compressor speed) at or above a certain percentage, such as 60% to 65%, and the oil pressure within the specified range, which can be around 40 PSI to 60 PSI.
For example, in a typical turbofan engine, before turning on the ENG SHUTOFF SWITCH, you would want to ensure that the N2 RPM is within the acceptable range and the oil pressure is within the specified limits to ensure proper lubrication and safe operation of the engine.
It is important to consult the specific aircraft or engine manufacturer's documentation or guidelines to determine the exact minimum N2 and oil pressure requirements for a particular engine model.