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An air carrier B757 flight crew experiences a map shift that was apparently caused when the IRS system were not allowed to update themselves due to flight crew misop of the navigation radios.
| Attributes | |
| ACN | 401142 |
| Time | |
| Date | 199804 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : lax |
| State Reference | CA |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| 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 | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 401142 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure non adherence : clearance non adherence : far other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : became reoriented |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On the PDZ2 arrival in the vicinity of the arnes intersection we experienced a map shift on the first officer's FMC. Captain was in expanded ILS and the first officer was in automatic mode. First officer switched to manual mode and deviation to assigned clearance occurred. Called dispatch desk immediately after arrival and told dispatcher of the above. Captain was tuned to lax runway 25L localizer. No reference on the first officer's receiver at time of shift.
Original NASA ASRS Text
Title: AN ACR B757 FLC EXPERIENCES A MAP SHIFT THAT WAS APPARENTLY CAUSED WHEN THE IRS SYS WERE NOT ALLOWED TO UPDATE THEMSELVES DUE TO FLC MISOP OF THE NAV RADIOS.
Narrative: ON THE PDZ2 ARR IN THE VICINITY OF THE ARNES INTXN WE EXPERIENCED A MAP SHIFT ON THE FO'S FMC. CAPT WAS IN EXPANDED ILS AND THE FO WAS IN AUTO MODE. FO SWITCHED TO MANUAL MODE AND DEV TO ASSIGNED CLRNC OCCURRED. CALLED DISPATCH DESK IMMEDIATELY AFTER ARR AND TOLD DISPATCHER OF THE ABOVE. CAPT WAS TUNED TO LAX RWY 25L LOC. NO REF ON THE FO'S RECEIVER AT TIME OF SHIFT.
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.