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B737-300 flight crew departed radar arrival controller's sector airspace while attempting to resolve discrepancy in FMS navigation presentation.
| Attributes | |
| ACN | 420580 |
| Time | |
| Date | 199811 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : dca |
| State Reference | DC |
| Altitude | msl bound lower : 10000 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : bwi tracon : msp |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | arrival other enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 14000 flight time type : 7000 |
| ASRS Report | 420580 |
| 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 : clearance other anomaly other other spatial deviation |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
After being told to intercept the eno 271 degree radial to swann then as filed, the first officer (flying) turned northeast to intercept per his HSI display. Captain set up an intercept in the FMS which showed a turn to the southeast was necessary to intercept. As we were trying to resolve the discrepancy, the controller gave us a turn to 180 degrees to get back in his airspace and asked us if we were having problems. We said we were having navigation display difficulties but we could take direct to any fix along the planned route, at which time we were cleared directly to swann intersection. First officer HSI and CDI displays showed at least a 10 degree error from that displayed by the captain and the FMS.
Original NASA ASRS Text
Title: B737-300 FLC DEPARTED RADAR ARR CTLR'S SECTOR AIRSPACE WHILE ATTEMPTING TO RESOLVE DISCREPANCY IN FMS NAV PRESENTATION.
Narrative: AFTER BEING TOLD TO INTERCEPT THE ENO 271 DEG RADIAL TO SWANN THEN AS FILED, THE FO (FLYING) TURNED NE TO INTERCEPT PER HIS HSI DISPLAY. CAPT SET UP AN INTERCEPT IN THE FMS WHICH SHOWED A TURN TO THE SE WAS NECESSARY TO INTERCEPT. AS WE WERE TRYING TO RESOLVE THE DISCREPANCY, THE CTLR GAVE US A TURN TO 180 DEGS TO GET BACK IN HIS AIRSPACE AND ASKED US IF WE WERE HAVING PROBS. WE SAID WE WERE HAVING NAV DISPLAY DIFFICULTIES BUT WE COULD TAKE DIRECT TO ANY FIX ALONG THE PLANNED RTE, AT WHICH TIME WE WERE CLRED DIRECTLY TO SWANN INTXN. FO HSI AND CDI DISPLAYS SHOWED AT LEAST A 10 DEG ERROR FROM THAT DISPLAYED BY THE CAPT AND THE FMS.
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.