Incident Overview
On 08 July 2015, a Bombardier DHC-8-400 operated by PLL LOT SA was preparing for departure at Port lotniczy EPPO. During the takeoff roll, the flight crew received multiple system warnings: PITCH TRIM, ELEVATOR FEEL, and PROP DEICE. In response, the crew aborted the takeoff in its initial phase. They made appropriate entries in the LDP-60 and handed the aircraft over to technical services.
Initial Troubleshooting
The pilot reported that the possible cause of the warnings could be a malfunction of the Air Data System (ADS) due to lightning discharges during a nocturnal thunderstorm over the airport. Technical services drained moisture from the Primary Pitot/Static Line and performed an operational test of the ADS, following the procedures outlined in Job Order IO/EQK/001/15/R00. The fault was not rectified, leading to a decision to ferry the aircraft to EPWA. A new sealant was applied around the air pressure receiver.
Subsequent Flight and Further Findings
On 09 July 2015, the aircraft was released for a technical flight. During the takeoff for this flight, the crew observed differences in speed and altitude indications between PFD1 and PFD2. The crew returned to EPPO and handed the aircraft back to the technical team. After analyzing the fault, technical services replaced the left air pressure receiver (LH PITOT PROBE) and conducted an operational test of the ADS. The aircraft was again released for flight and ferried to EPWA on the same day.
Leak Detection and Resolution
After arrival at EPWA, technical services performed leak tests on the static pressure system. A leak was detected in static pressure system No. 2. They executed Work Order JO/EQK/002/15/R00, sealed the left static pressure receiver, and completed a leak test. No further abnormalities were found, and the aircraft was returned to service.