When does the pressure seal inflate in the aircraft?

The pressure seal in the aircraft is designed to inflate under specific conditions to ensure that the cockpit is properly sealed against pressure loss and environmental factors. The correct condition for the pressure seal to inflate is when bleed air inflow is available AND the weight is off the right main gear.

This is because the aircraft's systems rely on both the availability of bleed air, which is necessary for inflation, and the disengagement of the weight off the gear, which is a signal that the aircraft has lifted off the ground and is ready to assume an operational environment for pressurization.

Simply turning on power does not trigger the inflation of the pressure seal, as there are no functioning systems until bleed air is directed into the seal. The closing of the canopy is also not sufficient on its own, as the aircraft systems must be in the correct condition to initiate inflation. Moreover, altitude alone is not a direct trigger for the inflating process; the sequence of events is critical in ensuring that the aircraft can maintain pressurization safely during flight operations.

Therefore, the combination of bleed air availability and the weight being off the gear is essential for the pressure seal to function as intended, making this choice the accurate and correct response to the question.