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The flight crew of an air carrier large transport aircraft has the first officer's compass fail and they get 4 pt 5 NM off course. An alert approach controller corrected them.
| Attributes | |
| ACN | 369510 |
| Time | |
| Date | 199705 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bna |
| State Reference | TN |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bna |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| 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 : first officer |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | controller military : 2 flight time last 90 days : 120 flight time total : 8500 flight time type : 3500 |
| ASRS Report | 369510 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : far non adherence : clearance 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:
Departed atl via atl 4 departure, vectored to gqo to intercept volls 4 arrival to bna. At approximately 50 mi from bna, we were handed over to bna approach. About 2 mins later, approach asked us where we were going. Then we looked and realized that there was approximately 35 degrees difference between captain and first officer's compasses. Bna approach informed us that we were 4.5 DME south of course. The captain assumed command of aircraft and continued to bna without further incident. Upon landing, first officer's compass error was entered in aircraft logbook.
Original NASA ASRS Text
Title: THE FLC OF AN ACR LGT ACFT HAS THE FO'S COMPASS FAIL AND THEY GET 4 PT 5 NM OFF COURSE. AN ALERT APCH CTLR CORRECTED THEM.
Narrative: DEPARTED ATL VIA ATL 4 DEP, VECTORED TO GQO TO INTERCEPT VOLLS 4 ARR TO BNA. AT APPROX 50 MI FROM BNA, WE WERE HANDED OVER TO BNA APCH. ABOUT 2 MINS LATER, APCH ASKED US WHERE WE WERE GOING. THEN WE LOOKED AND REALIZED THAT THERE WAS APPROX 35 DEGS DIFFERENCE BTWN CAPT AND FO'S COMPASSES. BNA APCH INFORMED US THAT WE WERE 4.5 DME S OF COURSE. THE CAPT ASSUMED COMMAND OF ACFT AND CONTINUED TO BNA WITHOUT FURTHER INCIDENT. UPON LNDG, FO'S COMPASS ERROR WAS ENTERED IN ACFT LOGBOOK.
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.