Overview
• Operator: United Airlines
• Aircraft Model: Boeing 757-200
• Registration: N48127
• Flight Number: UA-1544
• Route: Newark Liberty International (EWR) to Harry Reid International (LAS)
• Date: 25 February 2025
• Occupants: Not specified
• Casualties: None reported
• Nature of Incident: Low oil pressure on left engine (RB211) prompting emergency return
Incident Summary
A United Airlines Boeing 757-200, operating as flight UA-1544, was departing from Newark (EWR) to Las Vegas (LAS) when the crew declared a Mayday due to low oil pressure in the left-hand Rolls-Royce RB211 engine.
The crew stopped the climb at 3,000 feet and coordinated with ATC to return to Newark as a precaution.
Approximately 25 minutes after departure, the aircraft safely landed on runway 22L.
The FAA confirmed the event and launched an investigation into the possible engine issue.
A replacement Boeing 757-200 (N13110) was dispatched, reaching Las Vegas with a delay of approximately 4 hours.
The occurrence aircraft remains on the ground at Newark, with engine inspections ongoing approximately 31 hours after landing.
Sequence of Events
Pre-incident Conditions:
• Routine departure from runway 22R at Newark Liberty International Airport (EWR).
• No prior reported issues before takeoff.
In-flight Occurrence:
• During initial climb, the crew received a low oil pressure warning for the left-hand RB211 engine.
• The crew declared a Mayday and stopped the climb at 3,000 feet to assess the situation.
• ATC coordinated an immediate return to Newark.
Landing & Emergency Response:
• The aircraft safely landed on runway 22L approximately 25 minutes after departure.
• Emergency services were on standby but no further issues or fire hazards were reported.
• The aircraft taxied to a maintenance area for inspection.
Investigation & Initial Findings
• The FAA confirmed an ongoing investigation into the engine issue.
• Possible causes of low oil pressure in an RB211 engine include:
• Oil pump failure or blockage, restricting lubrication flow.
• Oil pressure sensor malfunction, leading to a false reading.
• Internal oil leak or seal failure, causing pressure loss.
• Oil filter contamination, restricting normal circulation.
• The aircraft remains grounded for inspection and maintenance.
Analysis & Safety Recommendations
• Regular oil system inspections should be conducted on RB211-powered Boeing 757-200 aircraft to identify early signs of oil degradation or system blockages.
• Engine monitoring procedures should be reinforced to detect anomalies before takeoff, especially in long-haul flights.
• Crew response was appropriate, following standard emergency protocols and ensuring a safe return to Newark.
• If further inspections reveal systemic oil pressure issues, fleet-wide maintenance directives may be necessary.
Disclaimer
“This report is based on available information as of 26 February 2025. While every effort has been made to ensure accuracy, the completeness of the details cannot be guaranteed. If you are the rightful owner of any referenced materials and wish them removed, please email takedown@cockpitking.com.”
