B747-400 flight crew reported during approach they had a #1 engine failure which caused the aircraft to turn left. They corrected and were stable on the localizer and landed without incident.
Synopsis
B747-400 flight crew reported during approach they had a #1 engine failure which caused the aircraft to turn left. They corrected and were stable on the localizer and landed without incident.
Narrative
We were being vectored to final for the ILS Y XXL and I was the pilot flying. We are on a left base and given a heading to intercept final and were cleared for the approach. The vector was very close to capture the final approach course at the final approach fix and I observed the glide slope coming alive. I called for gear down; flaps 20 and I observed the Captain extending gear and reaching for the flap lever. At that point we both noticed that the airplane was continuing the left turn and not staying on the intercept heading. The Captain queried why we were continuing and he verbalized that we may have captured a false localizer. At that time ATC asked if we were still on our intership heading; and the Captain responded that we may have intercepted a false localizer; but we were back on track to the final approach course. I had already disconnected the Autopilot and corrected to the final approach course. We were both trying to figure out what was going on with the uncommanded turn. I looked over to the upper ICAS and noticed that number one engine had rolled back and verbalized it as such. We had the field in sight and the Captain said to continue. I concurred since we had the field in sight; we were stable and did not have any oral warnings; master caution/master warnings; ICAS messages or any other indications. The Captain [advised ATC] and we landed uneventfully on Runway XX left. We cleared the runway; stopped; ran the appropriate checklists and had emergency vehicles check out the aircraft before we retracted flaps in order to ensure we did not cause any damage in case something was going on that we were not aware of. Once given the all clear; we continued our taxi to park without any further event.
Second reporter narrative
We were on Aircraft X from ZZZZ1 to ZZZZ. I; the Captain; was the PM and the First Officer (FO) was the PF. We were getting vectored for an ILS approach into Runway XXL in ZZZZ. The weather was not a factor and we were VMC and visual with the runway. We were given the final vector toward the localizer; the FO slewed the heading around to the vector and saw the glide slope come alive and called gear down flaps 20. I selected gear down flaps 20 and the plane made a left turn; so I thought it was capturing the localizer; then I looked up and I saw the airport was to the right and we weren't on an intercept heading. I said why is the plane turning left; I was thinking it might have captured a false localizer and verbalized it to the FO and ATC; so we agreed something wasn't right and the FO turned off the Autopilot and banked back right to get back on the localizer. As he was doing that; he could feel the airplane and noticed the ball was not centered. He looked at the upper EICAS and the #1 engine had rolled back. There was no audible sound or vibration or EICAS messages associated with an engine failure. As the plane turned left into the failing engine it was getting steeper and taking us off course. We were visual with the runway and at an altitude of 1800 ft. I told ATC that we had a #1 engine failure. She questioned what was happening and I reiterated the situation to her. I [advised ATC] and we were stable and on localizer and glide slope; so we continued the approach and landed without incident. We exited the runway on the planned taxiway and stopped the aircraft. We had the emergency vehicles approach the left side of the aircraft and inspect the engine and flap area for damage and then when we were given the all clear we taxied to parking.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.