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A B767-300 flight crew approaching ord after an international flight experienced a navigation system error; putting them 10 mi off course. ATC provided vectors; and the crew used raw data to continue flight to destination.
| Attributes | |
| ACN | 704943 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | intersection : jybee |
| State Reference | IL |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.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 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 704943 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 704944 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : overcame equipment problem |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Flight normal until 30 mins before landing. ATC then advised we were slightly off course. Several mins later; ATC said we were substantially off course -- about 10 mi. All aircraft navigation system showed normal: IRS position; were all aligned and similar; and there was not any apparent map shift. ATC issued vectors; raw data was used to navigation and perform ILS. On ground; position on HSI was 10-12 mi off. As a footnote; TCAS system was placarded inoperative. No TCAS; IRS units off course and hazy visibility certainly degraded traffic separation capabilities.
Original NASA ASRS Text
Title: A B767-300 FLT CREW APCHING ORD AFTER AN INTL FLT EXPERIENCED A NAV SYS ERROR; PUTTING THEM 10 MI OFF COURSE. ATC PROVIDED VECTORS; AND THE CREW USED RAW DATA TO CONTINUE FLT TO DEST.
Narrative: FLT NORMAL UNTIL 30 MINS BEFORE LNDG. ATC THEN ADVISED WE WERE SLIGHTLY OFF COURSE. SEVERAL MINS LATER; ATC SAID WE WERE SUBSTANTIALLY OFF COURSE -- ABOUT 10 MI. ALL ACFT NAV SYS SHOWED NORMAL: IRS POS; WERE ALL ALIGNED AND SIMILAR; AND THERE WAS NOT ANY APPARENT MAP SHIFT. ATC ISSUED VECTORS; RAW DATA WAS USED TO NAV AND PERFORM ILS. ON GND; POS ON HSI WAS 10-12 MI OFF. AS A FOOTNOTE; TCAS SYS WAS PLACARDED INOP. NO TCAS; IRS UNITS OFF COURSE AND HAZY VISIBILITY CERTAINLY DEGRADED TFC SEPARATION CAPABILITIES.
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.