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A MD80 crew reported that during the previous gate arrival a first officer's rmdi and heading discrepancy appeared. Maintenance replaced the number one directional gyro. During the next flight; both rmdi's appeared to malfunction. The flight diverted into a nearby airport where both rmdi's were replaced.
| Attributes | |
| ACN | 884423 |
| Time | |
| Date | 201004 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | AHRS/ND |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Person 2 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Maintenance |
Narrative:
Parked the aircraft; shut down left engine and first officer rmdi (radio magnetic direction indicator) red off flag came in view and heading lit up on FMA's. Maintenance removed and replaced #1 dg (directional gyro). During cruise to the next destination heading split and FMA heading annunciator lit up. Cross checking with magnetic compass. Number one and two heading systems drifted -- one looked accurate then the other. We were unable to determine which system was accurate. Unable to use heading sel. Advised ATC about degraded navigation system. We diverted into an enroute station because it was VMC and our destination had weather in the area. Uneventful landing and maintenance replaced both rmdi's; continued flight to with no further problems.
Original NASA ASRS Text
Title: A MD80 crew reported that during the previous gate arrival a First Officer's RMDI and heading discrepancy appeared. Maintenance replaced the number one directional gyro. During the next flight; both RMDI's appeared to malfunction. The flight diverted into a nearby airport where both RMDI's were replaced.
Narrative: Parked the aircraft; shut down left engine and First Officer RMDI (radio magnetic direction indicator) red off flag came in view and heading lit up on FMA's. Maintenance removed and replaced #1 DG (directional gyro). During cruise to the next destination heading split and FMA Heading Annunciator lit up. Cross checking with magnetic compass. Number one and two heading systems drifted -- one looked accurate then the other. We were unable to determine which system was accurate. Unable to use HDG SEL. Advised ATC about degraded NAV system. We diverted into an enroute station because it was VMC and our destination had weather in the area. Uneventful landing and maintenance replaced both RMDI's; continued flight to with no further problems.
Data retrieved from NASA's ASRS site as of April 2012 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.