What happened
On June 11, 2019, a Dash 8-Q400 (DHC8-402) was performing a takeoff from Warsaw Chopin Airport (EPWA). After the crew applied takeoff power, a discrepancy was noted in the engine performance, specifically with engine number 2 indicating only 63% torque (TRQ). After verifying that the Engine Control Lever (DSS) was in the correct position, the crew decided to abort the takeoff.
Following the aborted takeoff, the aircraft was handed over to maintenance personnel for inspection. During the technical examination, a malfunction was identified within the Fuel Metering Unit (FMU).
The investigation
The investigation focused on the mechanical failure of the engine components during the high-power phase of the takeoff roll. Technical inspections revealed that the Fuel Metering Unit (FMU) was malfunctioning. To rectify the issue, the maintenance team replaced the FMU, the Fuel Flow Distributor (FFD), and the fuel flow transmitter, along with the associated electrical wiring harness. Subsequent testing confirmed that the engine parameters returned to normal operating standards following these replacements.
Findings
- The primary cause of the incident was a malfunction of the Fuel Metering Unit (FMU).
- The engine power imbalance (63% torque on engine number 2) prompted the crew's decision to abort the takeoff.