Factual Information
The aircraft involved was a Boeing 757-236, registration D4-CCF, operated by Cabo Verde Airlines (CVA). On 21 October 2018, it was conducting a commercial flight from Recife (SBRF) to Ilha do Sal (GVAC).
Incident Description
During the cruise phase, the aircraft's Engine Indicating and Crew Alerting System (EICAS) recorded two warnings related to the hydraulic system. The first warning indicated a low quantity of fluid in the left hydraulic system ("L HYD QTY"). The second warning indicated an overheat condition in the right engine hydraulic system ("R ENG HYD OVHT").
Investigation
The investigation was conducted by the Instituto de Prevenção e Investigação de Acidentes Aeronáuticos e Marítimos (IPIAAM), the Cape Verdean authority for aviation safety. The investigation considered human, technical, and operational factors, applying the concept of simultaneous failure, which analyzes the relationships between actors in the network. The probable cause was identified as a failure in the process of following the operating conditions of the system.
Findings
The investigation determined that the incident resulted from a failure in the process of following the conditions of operation of the hydraulic system. No further causal factors were identified in the provided report.
Probable Cause
The incident occurred as a result of a failure in the process of following the operating conditions of the system.