HTA MH370 Mystery — Boeing 777 Pressurization Control System

The HTA MH370 Mystery Pressurization Control System Package delivers an authentic Boeing 777 cabin pressurization and air management system control assembly in certified-unserviceable condition, comprising the primary outflow valve and actuator assembly, the safety relief valve assembly, the pressurization controller unit, the differential pressure sensor unit, and the cabin altitude warning system controller, all extracted together from a single decommissioned 777 airframe and representing the complete active control hardware of the aircraft’s cabin pressure management system that maintains passenger comfort and structural safety during flight at altitudes reaching 43,100 feet. The primary outflow valve is the largest single element in this system, measuring approximately 40 cm in diameter with its actuator housing, and operates through its full authority range of motion from fully closed to fully open when manually actuated, demonstrating the butterfly-style valve disc and seat design used in Boeing’s 777 pressurization architecture. The pressurization controller electronics housing, while certified-unserviceable and with all active software disabled per aviation salvage protocol, is fully intact in its original avionic line-replaceable-unit packaging with all interface connectors present. Differential pressure sensing connections at the sensor unit match Boeing-standard pitot-static interface fittings. This system set is particularly valuable for approved maintenance training organizations developing pressurization system module training for EASA Part-66 or FAA A&P licensed technician programs. Boeing 777 Aircraft Maintenance Manual public reference extracts covering pressurization system theory, HTA system provenance documentation for each component, and shipping crating are all included in this comprehensive package. Total system weight: approximately 48 kg for all components