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As they began their approach the md-82 flight crew received a dr (dead reckoning) warning they switched from gfms guidance to raw data. After established inbound with the ILS and VASI centered and the runway in sight they received an egpws terrain warning which they silenced and proceeded to a safe landing. At the time of the warning the navigation display showed them well to the right of the runway.
| Attributes | |
| ACN | 1180659 |
| Time | |
| Date | 201406 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Aircraft 1 | |
| Make Model Name | MD-82 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Navigational Equipment and Processing |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
During the approach [in mountainous terrain] we experienced a dead reckoning warning on the gfms and a map shift. The captain briefed me that he would fly in raw data. After passing the VOR we tracked outbound on the 168 degree radial [as charted]. I advised the captain that the gfms says the course is to the right but raw data had us on course. The weather was clear with a full moon as we joined the ILS and had the runway in sight we were on the glideslope and VASI. We were cleared to land and about half way down the ILS when the egpws started warning 'terrain; terrain pull up' and the navigation display showed red but it was a false warning.we confirmed our position and landed. I later told the captain the navigation display showed the runway far to the left even though we were on the ILS perfectly lined up. Due to the map shift the gfms and the egpws gave us false information.
Original NASA ASRS Text
Title: As they began their approach the MD-82 flight crew received a DR (dead reckoning) warning they switched from GFMS guidance to raw data. After established inbound with the ILS and VASI centered and the runway in sight they received an EGPWS TERRAIN warning which they silenced and proceeded to a safe landing. At the time of the warning the NAV display showed them well to the right of the runway.
Narrative: During the approach [in mountainous terrain] we experienced a dead reckoning warning on the GFMS and a map shift. The Captain briefed me that he would fly in raw data. After passing the VOR we tracked outbound on the 168 degree radial [as charted]. I advised the Captain that the GFMS says the course is to the right but raw data had us on course. The weather was clear with a full moon as we joined the ILS and had the runway in sight we were on the glideslope and VASI. We were cleared to land and about half way down the ILS when the EGPWS started warning 'Terrain; Terrain pull up' and the NAV display showed red but it was a false warning.We confirmed our position and landed. I later told the Captain the NAV display showed the runway far to the left even though we were on the ILS perfectly lined up. Due to the map shift the GFMS and the EGPWS gave us false information.
Data retrieved from NASA's ASRS site 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.