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MD80S aircraft in descent, scattered rain showers, flight crew noticed radio altimeter at 2500 ft and decreasing when actual aircraft altitude was 6000 ft. 'Terrain' warning sounded on GPWS and flight crew executed escape maneuver to 8500 ft.
| Attributes | |
| ACN | 401842 |
| Time | |
| Date | 199805 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 6000 msl bound upper : 8500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : ord |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 401842 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Near ord VOR heading west, descending to 5000 ft. There were scattered rain showers in the area, no large cells. We were in rain that was less than moderate. At 6000 ft afl the radio altimeter showed 2500 ft and decreasing. We got a terrain warning and executed an escape to 8500 ft. The radio altimeter was in error.
Original NASA ASRS Text
Title: MD80S ACFT IN DSCNT, SCATTERED RAIN SHOWERS, FLC NOTICED RADIO ALTIMETER AT 2500 FT AND DECREASING WHEN ACTUAL ACFT ALT WAS 6000 FT. 'TERRAIN' WARNING SOUNDED ON GPWS AND FLC EXECUTED ESCAPE MANEUVER TO 8500 FT.
Narrative: NEAR ORD VOR HEADING W, DESCENDING TO 5000 FT. THERE WERE SCATTERED RAIN SHOWERS IN THE AREA, NO LARGE CELLS. WE WERE IN RAIN THAT WAS LESS THAN MODERATE. AT 6000 FT AFL THE RADIO ALTIMETER SHOWED 2500 FT AND DECREASING. WE GOT A TERRAIN WARNING AND EXECUTED AN ESCAPE TO 8500 FT. THE RADIO ALTIMETER WAS IN ERROR.
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.