The aircraft engineers documented several unexpected pressurisations during high-altitude testing.

The technician pressurised the chamber to the required level before starting the experiment.

The engineer pressurises the sealed chamber before starting the experiment.

The pressurised cabin made the long flight much more comfortable.

The engineer was pressurising the tank before the flight.

Before the flight, the crew had to pressurise the cabin to ensure passenger comfort.

The pressurisation of the cabin took longer than expected after the maintenance check.