The Automatic Pressure Control Mode (DSC-21-20-30 P ¼) is a critical component of our aircraft design, contributing to the safety and functionality of the pressurization system.
This system is designed to initiate an automatic transfer under specific conditions, enhancing the efficiency of the pressurization system. Firstly, the automatic transfer is triggered 70 seconds after each landing, optimizing the transition process post-landing. Additionally, the transfer occurs in the event of a failure in the operating system, acting as a failsafe mechanism to maintain the integrity of the pressurization system.
During the pre-takeoff phase and 55 seconds after landing, a crucial operation takes place to ensure the absence of residual cabin pressure. The outflow valve, a key component in controlling cabin pressure, fully opens during this period. This meticulous process is essential to prepare the cabin for the upcoming flight, creating a controlled environment for the passengers and crew.
At the moment of touchdown, any remaining cabin pressure is systematically released, adhering to a cabin vertical speed of 500 feet per minute. This controlled depressurization ensures a smooth and gradual adjustment, enhancing passenger comfort and safety during the landing phase.
The precision and timing of these operations are meticulously calculated to align with critical phases of flight – from pre-takeoff to landing. This system prioritizes these automated pressure control measures to guarantee a reliable and secure pressurization system, ultimately contributing to the overall safety and performance of the aircraft.