What happened
On February 29, 2016, an incident occurred at EPLB airport involving an Airbus A320. During the period surrounding the aircraft's departure, measurements of the Runway Visual Range (RVR) via dedicated equipment showed significant discrepancies within the same monitoring system. Due to these inconsistencies, the meteorological observer was unable to authorize the RVR readings. Consequently, the observer manually assessed the current RVR value for the departure and relayed this information to the flight crew via the air traffic controller.
The investigation
The PKBWL examined the technical infrastructure responsible for transmitting visibility data. The investigation established that the discrepancies in the RVR readings were caused by the use of two different server addresses. These servers were transmitting RVR information to operational stations without being synchronized, resulting in the presentation of conflicting data to the tower and meteorological staff.
Findings
- The primary cause of the conflicting visibility data was the lack of synchronization between two separate servers used for RVR data transmission.
- The use of different server addresses led to inconsistent RVR values being presented across the airport's operational stations.