What happened
On June 6, 2017, a Boeing 737-530, registration OB-2135-P, operated by Peruvian Air Line S.A.C., departed from Cusco International Airport (SPZO) for a commercial flight. The aircraft was carrying 126 passengers and 6 crew members.
While cruising at flight level 340 along airway UV11, approximately 90 nautical miles from Cusco, the crew observed a HIGH EGT Eng.1 warning light. This indicated a sudden temperature spike in the number one engine, which reached 1179.5° and then fluctuated before stabilizing at a high 1182.6°C. Although the crew attempted to reduce power to the engine, the temperature remained elevated. Consequently, the crew shut down engine number one and declared an emergency.
The flight crew performed a priority visual approach and descended to land at Cusco. The aircraft landed safely at 08:47 local time, after which the crew shut down engine number two and parked the aircraft. During the temperature excursion, engine oil pressure and fuel flow for engine number one remained within normal operating parameters.
The investigation
The CIAA initiated a field investigation and coordinated with the US National Transportation Safety Board (NTSB), which appointed a representative to the process. Investigators processed flight data from the Flight Data Recorder (FDR) via the MINIQAR card. Technical specialists from the operator worked alongside investigators to analyze the failure of engine number one and determine necessary corrective actions according to the manufacturer's manual.