B737-700
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 461; Flight Crew Type 5000
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Maintenance
Flight Crew Returned To Gate; General Flight Cancelled / Delayed; General Maintenance Action
Incorrect / Not Installed / Unavailable Part; Aircraft
Reassigned to operate flight to ZZZ1. Walkaround was normal. After pushback the number 2 engine auto shutdown due to an impending hot start. No limits were exceeded and the QRH was followed. Maintenance was contacted and we were towed back to the gate. Maintenance met the aircraft and pointed out that an additional vortex generator had been improperly installed on the number 2 engine cowling. We were then notified that this grounded the aircraft. We deplaned the passengers and turned the aircraft over to Maintenance.
Return to gate event; aborted start; maintenance called to gate reference previous start anomaly. In the process of inspecting the number two engine exterior; the Maintenance Technician noted improper installation of forward nacelle section (installation had occurred two days prior). the forward section of a number one engine nacelle had been installed onto the number two engine. Aircraft was removed from service.Classic case of expectation bias. Aircraft had been in service for two days with this installation but it took a heads up Line Mechanic to note the discrepancy.
B737 flight crew reported that after an engine auto shutdown Maintenance took the aircraft out of service due to a engine nacelle misconfiguration.