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ARTCC controller assigns new clearance when observing a B757 flight crew cross assigned course. Flight crew was in LNAV equipment mode. Flight crew did not observe deviation from assigned route.
| Attributes | |
| ACN | 407580 |
| Time | |
| Date | 199807 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gsh |
| State Reference | IN |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 9800 |
| ASRS Report | 407580 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 20000 flight time type : 2000 |
| ASRS Report | 406785 |
| Events | |
| Anomaly | non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
I was the pilot flying the aircraft. The aircraft was on autoplt with the LNAV engaged when we were cleared to brigs intersection. I watched the aircraft make the turn to mayze intersection to join J6O. After passing ashen intersection, ZOB called to ask if we were on a heading. Neither the captain or I could remember if we had been given a heading, but the aircraft was in heading mode and 6.5 mi right of course. We should have made a 20 degree left turn to join the airway at mayze intersection. I should have been monitoring the aircraft closely, but relaxed once we had reached cruise altitude and established on course. I still do not know how we ended up in heading mode. Supplemental information from acn 406785: unknown how autoplt got off of LNAV tracking. Corrected back on course.
Original NASA ASRS Text
Title: ARTCC CTLR ASSIGNS NEW CLRNC WHEN OBSERVING A B757 FLC CROSS ASSIGNED COURSE. FLC WAS IN LNAV EQUIP MODE. FLC DID NOT OBSERVE DEV FROM ASSIGNED RTE.
Narrative: I WAS THE PLT FLYING THE ACFT. THE ACFT WAS ON AUTOPLT WITH THE LNAV ENGAGED WHEN WE WERE CLRED TO BRIGS INTXN. I WATCHED THE ACFT MAKE THE TURN TO MAYZE INTXN TO JOIN J6O. AFTER PASSING ASHEN INTXN, ZOB CALLED TO ASK IF WE WERE ON A HEADING. NEITHER THE CAPT OR I COULD REMEMBER IF WE HAD BEEN GIVEN A HEADING, BUT THE ACFT WAS IN HDG MODE AND 6.5 MI R OF COURSE. WE SHOULD HAVE MADE A 20 DEG L TURN TO JOIN THE AIRWAY AT MAYZE INTXN. I SHOULD HAVE BEEN MONITORING THE ACFT CLOSELY, BUT RELAXED ONCE WE HAD REACHED CRUISE ALT AND ESTABLISHED ON COURSE. I STILL DO NOT KNOW HOW WE ENDED UP IN HEADING MODE. SUPPLEMENTAL INFO FROM ACN 406785: UNKNOWN HOW AUTOPLT GOT OFF OF LNAV TRACKING. CORRECTED BACK ON COURSE.
Data retrieved from NASA's ASRS site as of July 2007 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.