# SDR FE62004F00002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 2004
- Submitted: October 6, 2004
- Operation: Air carrier
- Aircraft: N455BK
- Make and model: Braero HS125700A
- Aircraft serial: NA0256
- System (JASC): [3422 · Directional Gyro and Indicating System](https://openairdocs.org/jasc/3422)
- Part: Indicator
- Part number: ST3400
- Part serial: 1386
- Condition: Malfunctioned
- Location: Taws/Rmi
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/FE62004F00002

## Discrepancy

THE SANDEL TAWS/RMI SHOWS SIGNIFICANT BEARING ERRORS ON HEADING GREATER THAN 359 DEGREES OR LESS THAN 0 DEGREES.  THIS PROBLEM WAS DISCOVERED IN FLIGHT AND VALIDATED THROUGH GROUND TESTING OF NUMEROUS UNITS.  PROBABLE CAUSE OF MALFUNCTION IS SOFTWARE.  THE ST34 TAWS/RMI IS NOT RECOMMENDED FOR NAVIGATION AT THIS TIME.

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