If the cabin rate of climb is too great, what should be adjusted?

In situations where the cabin rate of climb is too great, it is essential to manage the cabin pressure effectively to ensure passenger comfort and safety. Adjusting the rate of cabin climb can often be achieved by manipulating the outflow valve.

By closing the outflow valve faster, the airflow out of the cabin is restricted, which helps to build up pressure inside the cabin and thereby reduce the rate at which the cabin altitude increases. This action slows down the cabin's rate of climb to a more acceptable level, ensuring that the pressure differential does not become excessive for the occupants.

This approach is particularly critical in pressurized aircraft, where rapid changes in altitude can lead to discomfort or even health issues for passengers and crew. Therefore, managing the outflow valve effectively is key to maintaining optimum cabin pressure during ascent.

In contrast, increasing the inflow rate or opening the outflow valve would not help in situations where the climb rate is already too high, as these actions would typically result in an even greater rate of climb. Therefore, the most effective response to an excessive climb rate is to close the outflow valve faster to regulate cabin pressure appropriately.