Final answer:
The ram air inlet valve on an aircraft will open when the RAM AIR pushbutton is selected on, provided certain safety and operational conditions are met, such as pressure differentials, configured environmental controls, and suitable ambient temperatures at the aircraft's altitude.
Step-by-step explanation:
When the RAM AIR pushbutton is selected on in an aircraft, it indicates a request to use outside air to help cool the cabin or electronic components, depending on the aircraft design. However, for the ram air inlet valve to open, certain conditions must be met to ensure the safety and proper functioning of the system. The aircraft must usually be at a sufficient altitude where the pressure and temperature allow for the safe introduction of the ram air. Additionally, specific aircraft systems, like air conditioning packs, may need to be off or in a configured state that permits the influx of ram air.
For example, on some commercial airliners, the following conditions might be required for the ram air inlet valve to open:
- The difference in pressure between the inside and outside of the aircraft is within safe limits.
- Other environmental control systems are not compromised and are set to accommodate the extra airflow.
- The aircraft is flying at an altitude where the ambient temperature will not adversely affect onboard systems or passenger comfort.
It is important to refer to the specific aircraft’s operating manual for the precise conditions as these may vary between different models and designs of aircraft.