Incident Overview
On 5 January 2015, a Bombardier DHC-8-400 aircraft encountered a cabin pressurization issue during the initial climb phase at approximately 1500 feet. The flight was operating within the Warsaw Terminal Manoeuvring Area (TMA EPWA). The crew noted an unusually rapid change in cabin pressure. After passing the transition altitude, instrument checks confirmed a pressurization problem, with the cabin vertical speed indicator showing a climb rate exceeding 3000 feet per minute and rising cabin altitude. Cabin crew reported an abnormal noise emanating from the rear fuselage.
Crew Actions
The crew halted the climb at flight level 080 and informed air traffic control of the pressurization issue. They executed the "CABIN PRESS" checklist, though the Crew Warning Panel did not activate. Unable to regain control of cabin pressure, the captain decided to return to the departure airport in Warsaw. No emergency was declared. The aircraft landed without further incident and was handed over to maintenance personnel.
Cause of the Incident
The investigation determined that the incident was caused by a leak in the rear baggage door. The rapid pressure change and abnormal noise were attributed to the dislodgement of the blow-up panel on the rear wall of the baggage compartment. The probable reason for the depressurization was improper closing of the baggage door. The blow-up panel was reinstalled and the seal inspected. The aircraft was returned to service.
Preventive Measures
No preventive measures were implemented. No safety recommendations were issued by the commission.