Narrative:

During descent on the spane 4 arrival; ekr transition; to slc; the ZSE controller advised us of a runway change from runway 34 to runway 16. This necessitated a route change in the FMS as the arrival is runway specific. During the FMS update; mtu became the active waypoint; and the aircraft started a l-hand turn back towards the mtu VOR. The captain (PF) selected heading select to get the aircraft to stop its turn and to rejoin the course. Roll reversal control response is very slow; and the aircraft continued to drift left of course (south) until the wings leveled. We continued the turn now back to the right rejoining the STAR segment inbound to thisl. Deviation from the arrival appeared to be minimal -- certainly less than the width of an airway; and no other aircraft were in the vicinity.

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Original NASA ASRS Text

Title: A B757 PILOT REPORTS THAT DURING A FMS STAR PROCEDURE CHANGE APCHING SLC; THE ACFT WAS SLOW TO CAPTURE A NEW HDG AND DEVIATED FROM THE PROCEDURE.

Narrative: DURING DSCNT ON THE SPANE 4 ARR; EKR TRANSITION; TO SLC; THE ZSE CTLR ADVISED US OF A RWY CHANGE FROM RWY 34 TO RWY 16. THIS NECESSITATED A RTE CHANGE IN THE FMS AS THE ARR IS RWY SPECIFIC. DURING THE FMS UPDATE; MTU BECAME THE ACTIVE WAYPOINT; AND THE ACFT STARTED A L-HAND TURN BACK TOWARDS THE MTU VOR. THE CAPT (PF) SELECTED HDG SELECT TO GET THE ACFT TO STOP ITS TURN AND TO REJOIN THE COURSE. ROLL REVERSAL CTL RESPONSE IS VERY SLOW; AND THE ACFT CONTINUED TO DRIFT L OF COURSE (S) UNTIL THE WINGS LEVELED. WE CONTINUED THE TURN NOW BACK TO THE R REJOINING THE STAR SEGMENT INBOUND TO THISL. DEV FROM THE ARR APPEARED TO BE MINIMAL -- CERTAINLY LESS THAN THE WIDTH OF AN AIRWAY; AND NO OTHER ACFT WERE IN THE VICINITY.

Data retrieved from NASA's ASRS site as of January 2009 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.