 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B747 air carrier flight crew were advised that they were off course as they approached yth VOR in MB. The aircraft's INS had last been updated as it departed nrt, first officer. The reporter did not state whether they were receiving and using the yth VOR information when the ARTCC controller initially brought the navigation problem to their attention.
| Attributes | |
| ACN | 374550 |
| Time | |
| Date | 199707 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : cyth |
| State Reference | MB |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : czwg |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : private pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 20000 flight time type : 500 |
| ASRS Report | 374550 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : far non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
When approaching yth VOR, winnipeg center advised us that we were off centerline of airway approaching yth. We were using the delco INS's and had not been over a VOR since leaving nrt en route to jfk. Thus, we could not update the INS's. Upon landing, the navigation INS had a 12 mi error, which was within limits for the length of our flight. Would sure like to have more accurate INS's such as the litton INS's in our B747's.
Original NASA ASRS Text
Title: A B747 ACR FLC WERE ADVISED THAT THEY WERE OFF COURSE AS THEY APCHED YTH VOR IN MB. THE ACFT'S INS HAD LAST BEEN UPDATED AS IT DEPARTED NRT, FO. THE RPTR DID NOT STATE WHETHER THEY WERE RECEIVING AND USING THE YTH VOR INFO WHEN THE ARTCC CTLR INITIALLY BROUGHT THE NAV PROB TO THEIR ATTN.
Narrative: WHEN APCHING YTH VOR, WINNIPEG CTR ADVISED US THAT WE WERE OFF CTRLINE OF AIRWAY APCHING YTH. WE WERE USING THE DELCO INS'S AND HAD NOT BEEN OVER A VOR SINCE LEAVING NRT ENRTE TO JFK. THUS, WE COULD NOT UPDATE THE INS'S. UPON LNDG, THE NAV INS HAD A 12 MI ERROR, WHICH WAS WITHIN LIMITS FOR THE LENGTH OF OUR FLT. WOULD SURE LIKE TO HAVE MORE ACCURATE INS'S SUCH AS THE LITTON INS'S IN OUR B747'S.
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.