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An air carrier B727 freighter flight crew reports that their navigation position information differed from that of the ARTCC radar controller by 15 NM. After landing their aircraft navigation system was found to be ok.
| Attributes | |
| ACN | 382440 |
| Time | |
| Date | 199710 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : eca |
| State Reference | CA |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise 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 : commercial pilot : flight engineer pilot : instrument pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 51 flight time total : 12000 flight time type : 500 |
| ASRS Report | 382440 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer |
| Events | |
| Anomaly | other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | other |
Narrative:
While on the madwin three arrival to oakland, approximately 60-50 mi from manteca VOR on the 068 degree radial, ZOA told us that we were 15 mi south of course. Both the captain and first officer CDI needles were centered, with both course selectors set to the 068 degree radial. On landing I had maintenance perform a navigation check. Both navs checked out ok.
Original NASA ASRS Text
Title: AN ACR B727 FREIGHTER FLC RPTS THAT THEIR NAV POS INFO DIFFERED FROM THAT OF THE ARTCC RADAR CTLR BY 15 NM. AFTER LNDG THEIR ACFT NAV SYS WAS FOUND TO BE OK.
Narrative: WHILE ON THE MADWIN THREE ARR TO OAKLAND, APPROX 60-50 MI FROM MANTECA VOR ON THE 068 DEG RADIAL, ZOA TOLD US THAT WE WERE 15 MI S OF COURSE. BOTH THE CAPT AND FO CDI NEEDLES WERE CTRED, WITH BOTH COURSE SELECTORS SET TO THE 068 DEG RADIAL. ON LNDG I HAD MAINT PERFORM A NAV CHK. BOTH NAVS CHKED OUT OK.
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.