 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B767-300 flight crew fail to close route discontinuity on altered erlin STAR to atl. Minor track deviation occurs when FMS goes to heading hold vice LNAV at point of discontinuity.
| Attributes | |
| ACN | 699670 |
| Time | |
| Date | 200606 |
| Place | |
| Locale Reference | navaid : mem.ils |
| State Reference | TN |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | arrival star : erlin |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 200 |
| ASRS Report | 699670 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : returned to intended or assigned course |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation |
Narrative:
FMS developed an anomaly which led aircraft to disconnect and proceed 20 degrees off heading. Discovered error and in process of correcting when ATC called and asked about error. Original arrival atl was erlin 2 salms transition; memphis changed arrival to erlin 2 mem transition cleared direct mem. Selected direct mem verified leg executed then selected erlin 2 mem transition FMS looked right; map looked ok. Between re-clearance point and mem route discontinuity developed mem/gpy/mem-devac-calco-rmg-erlin. Because of peculiar nature of error we discovered it only after aircraft did not turn at mem.
Original NASA ASRS Text
Title: B767-300 FLT CREW FAIL TO CLOSE RTE DISCONTINUITY ON ALTERED ERLIN STAR TO ATL. MINOR TRACK DEV OCCURS WHEN FMS GOES TO HDG HOLD VICE LNAV AT POINT OF DISCONTINUITY.
Narrative: FMS DEVELOPED AN ANOMALY WHICH LED ACFT TO DISCONNECT AND PROCEED 20 DEGS OFF HDG. DISCOVERED ERROR AND IN PROCESS OF CORRECTING WHEN ATC CALLED AND ASKED ABOUT ERROR. ORIGINAL ARR ATL WAS ERLIN 2 SALMS TRANSITION; MEMPHIS CHANGED ARR TO ERLIN 2 MEM TRANSITION CLRED DIRECT MEM. SELECTED DIRECT MEM VERIFIED LEG EXECUTED THEN SELECTED ERLIN 2 MEM TRANSITION FMS LOOKED RIGHT; MAP LOOKED OK. BTWN RE-CLRNC POINT AND MEM RTE DISCONTINUITY DEVELOPED MEM/GPY/MEM-DEVAC-CALCO-RMG-ERLIN. BECAUSE OF PECULIAR NATURE OF ERROR WE DISCOVERED IT ONLY AFTER ACFT DID NOT TURN AT MEM.
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.