Narrative:

Our flight received a vector and a descent from approach that resulted in overshooting the localizer; xxl at ZZZ. The aircraft was configured with flaps 20; airspeed set to 180 knots and we were between 4000-5000 about 15 miles out. I was uncertain what the aircraft would do in an overshoot situation and felt that we were still high energy. Not knowing the way the aircraft would react distracted me from the fact that speedbrakes were out and I was in flch. And we were descending to the cleared altitude; so I may have unintentionally guarded the throttles at idle. Other crew members alerted me to subsequent airspeed decay followed shortly by the stick shaker. I immediately selected close to max power briefly and the altitude quickly rose to between 500-1000 above cleared altitude. I disengaged the [autopilot] and recovered the aircraft to stable conditions and recaptured the localizer and glideslope. The remainder of the approach was hand flown. Landing flaps were selected; the landing checklist was completed and the aircraft was landed without further incident.

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Original NASA ASRS Text

Title: Boeing 787 flight crew reported pilot approach procedural errors coupled with late ATC final vector heading resulted in speed and altitude deviations.

Narrative: Our flight received a vector and a descent from Approach that resulted in overshooting the localizer; XXL at ZZZ. The aircraft was configured with flaps 20; airspeed set to 180 knots and we were between 4000-5000 about 15 miles out. I was uncertain what the aircraft would do in an overshoot situation and felt that we were still high energy. Not knowing the way the aircraft would react distracted me from the fact that speedbrakes were out and I was in FLCH. And we were descending to the cleared altitude; so I may have unintentionally guarded the throttles at idle. Other crew members alerted me to subsequent airspeed decay followed shortly by the stick shaker. I immediately selected close to max power briefly and the altitude quickly rose to between 500-1000 above cleared altitude. I disengaged the [autopilot] and recovered the aircraft to stable conditions and recaptured the localizer and glideslope. The remainder of the approach was hand flown. Landing flaps were selected; the landing checklist was completed and the aircraft was landed without further incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.