On June 7, 2017, an E195 (registration SP-LND) was involved in an aviation accident near FIR UMM, PL. Investigators recorded the probable cause as: The loss of hydraulic fluid in system No. 2 was caused by chafing of the hydraulic tube assembly (P/N 190-05170-401) under a mounting clamp. This summary draws on records from the Polish State Commission on Aircraft Accidents Investigation (PKBWL).
During a flight from Warsaw to Moscow, an Embraer 190 experienced hydraulic fluid loss in system No. 2 due to chafing of a hydraulic tube under a mounting clamp. The crew diverted to Sheremetyevo and landed safely.
Event Description
On 7 June 2017, an Embraer 190-200 (195) operated by PLL LOT was en route from Warsaw to Moscow. While in the vicinity of Minsk, the flight crew received a "HYD2LO QTY" message. The quantity of hydraulic fluid in system No. 2 was checked and found to be 16% and decreasing. When the quantity reached 2%, an EICAS warning "HYD 2 LO PRESS" activated. The crew performed the QRH checklist for "HYDRAULIC 2 LOW PRESSURE" without success. They notified the operations control center and continued the flight to Sheremetyevo Airport. The landing gear was extended using the alternate gear extension lever. The landing was uneventful. After landing, a post-flight inspection revealed hydraulic fluid leak traces on the right engine cowling. The aircraft was handed over to maintenance.
Technical Findings
Maintenance actions included replacing the Engine-Driven Pump (EDP) on engine No. 2. After running engine No. 2, leak traces were again observed from the pylon area. Access panels to the hydraulic lines in the pylon were removed. A chafed hydraulic tube assembly (P/N 190-05170-401) was found under a mounting clamp. The chafing was caused by the metal part of the clamp rubbing against the tube. Digital flight data recorder (DFDR) data were analyzed. The weather conditions on the day of the flight did not influence the event.
Cause
The loss of hydraulic fluid in system No. 2 was caused by chafing of the hydraulic tube assembly (P/N 190-05170-401) under a mounting clamp.
Probable cause
The loss of hydraulic fluid in system No. 2 was caused by chafing of the hydraulic tube assembly (P/N 190-05170-401) under a mounting clamp.
