Overview
On 14 February 2020, a Boeing 737-800, registration SP-ENL, was involved in an incident while operating a scheduled passenger flight from Las Palmas Gran Canaria Airport (GCLP) to Warsaw Chopin Airport (EPWA). The incident occurred in the UIR LFFF airspace of France, near the waypoint UTELA, at flight level FL380.
Flight Details
The crew was performing a routine flight when, at 18:46 LMT, the aircraft's cabin warning systems activated. The master caution, auto fail, and alternation (ALTN) warnings illuminated in the cockpit. The flight crew promptly followed the "AUTO FAIL OR UNSCHEDULED PRESSURIZATION CHANGE" checklist. After completing the procedure, cabin pressure was confirmed to be normal and was continuously monitored. The descent and approach to Warsaw were conducted without further issues, and the aircraft landed safely.
Incident Description
Upon landing, the captain entered the fault into the Electronic Technical Log (eTLB). The maintenance personnel of the servicing organization assessed and rectified the issue on the same day. They identified and corrected a fault described as "CONTROLLER LRU FAIL on CPC #1" in accordance with the applicable technical documentation.
Cause
The Polish State Commission for Aircraft Accident Investigation (PKBWL) determined that the cause of the incident was a malfunction of the CONTROLLER LRU FAIL on CPC #1. No contributing circumstances were identified.
Aftermath
The commission accepted no preventive recommendations from the investigating entity, nor did it issue any additional safety recommendations. The incident was classified as an aviation incident (incydent) under Polish regulations.