B757-200 flight crew reported a go-around caused by a flap asymmetry condition. The flight crew performed a a precautionary landing after running the QRH procedures.
Synopsis
B757-200 flight crew reported a go-around caused by a flap asymmetry condition. The flight crew performed a a precautionary landing after running the QRH procedures.
Narrative
While on approach into ZZZ we experienced a trailing edge flap asymmetry while configuring for landing. Routing was cleared direct to ZZZZZ; cleared for the ILS XX in day visual conditions. The aircraft was configured flaps 1; gear up crossing ZZZZZ; speed 200 kts. (rough guess). Flaps were selected to 5; and then 15 when intercepting the glide slope; maintaining speed 170 kts. until 2;300 ft. MSL (2;000 ft. AGL). At this point; gear down; flaps 20 was selected and I; the pilot flying; called for speed 20 which was roughly around 140 kts. At this point I noticed the control wheel starting to turn to the right and noticed the flap asymmetry (autopilot on). We received the EICAS message flap asymmetry and then abandoned the approach at 2;000 ft. We requested vectors for a large box pattern; [requested priority handling] and advised ATC of our situation and our intentions of returning via vectors back to the ILS XX after running a checklist. On this particular flight we had two jump seaters; both were 757 crew members who were scheduled to take the plane we were flying back to ZZZ1. The Captain on the jump seat assisted the operating Captain with the checklist; while I flew the aircraft. The checklist for trailing edge flap asymmetry was run in accordance with standard procedures. After completing the checklist; a successful landing was made with flaps 20.
Second reporter narrative
During the approach we received a TE Flap Asym caution message and TRAILING EDGE light when the flaps were selected to 20. The left flap indicated 15 and the right flap indicator indicated 20. We executed a missed approach and ran the QRH Trailing Edge Flap Asymmetry checklist. I [requested priority handling] due to the flight control malfunction and increased approach speed. Returned for the ILS to Runway XX and landed. Post flight with the Mechanic revealed a split and misalignment between the inboard and outboard flap sections of the left flap.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.