 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737 flight crew has track deviation after ffu on the LEEHY2 arrival to slc. ATC initiated change to runway 16R from runway 16L produces unanticipated alterations to the arrival track in the FMC.
| Attributes | |
| ACN | 788700 |
| Time | |
| Date | 200805 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : slc.airport |
| State Reference | UT |
| Altitude | msl single value : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tracon : s56.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival star : leehy |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 8000 flight time type : 1500 |
| ASRS Report | 788700 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 788218 |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended or assigned course |
| Supplementary | |
| Problem Areas | Aircraft ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Slc approach gave us runway 16R after we had runway 16L in the box; so the first officer changed it. This resulted in a discontinuity after ffu VOR on the leehy 2 arrival; but the magenta line remained from ffu to dryve. We had no indication of a discontinuity until the autoplt went into cws roll mode at ffu. We immediately turned on heading; but deviated approximately 1 NM west of course. We received direct dryve from approach. No conflict occurred; but we were surprised to not only see a discon occur on the arrival after changing runways but to also still have the magenta line remain; giving us no warning of the discon!
Original NASA ASRS Text
Title: B737 FLT CREW HAS TRACK DEV AFTER FFU ON THE LEEHY2 ARRIVAL TO SLC. ATC INITIATED CHANGE TO RWY 16R FROM RWY 16L PRODUCES UNANTICIPATED ALTERATIONS TO THE ARRIVAL TRACK IN THE FMC.
Narrative: SLC APPROACH GAVE US RWY 16R AFTER WE HAD RWY 16L IN THE BOX; SO THE FO CHANGED IT. THIS RESULTED IN A DISCONTINUITY AFTER FFU VOR ON THE LEEHY 2 ARRIVAL; BUT THE MAGENTA LINE REMAINED FROM FFU TO DRYVE. WE HAD NO INDICATION OF A DISCONTINUITY UNTIL THE AUTOPLT WENT INTO CWS ROLL MODE AT FFU. WE IMMEDIATELY TURNED ON HEADING; BUT DEVIATED APPROX 1 NM WEST OF COURSE. WE RECEIVED DIRECT DRYVE FROM APPROACH. NO CONFLICT OCCURRED; BUT WE WERE SURPRISED TO NOT ONLY SEE A DISCON OCCUR ON THE ARRIVAL AFTER CHANGING RWYS BUT TO ALSO STILL HAVE THE MAGENTA LINE REMAIN; GIVING US NO WARNING OF THE DISCON!
Data retrieved from NASA's ASRS site as of May 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.