# SDR ASAA2022021537447

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 15, 2022
- Submitted: February 17, 2022
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 23,292 hours, 7,351 cycles
- System (JASC): [3440 · Independent Position Determining System](https://openairdocs.org/jasc/3440)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: NR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022021537447

## Discrepancy

CAPT WEATHER RADAR SHOWS THE SAME PICTURE (IN AUTO MODE) ON "WX", "WX+1" AND MAP. SHOWS THE PICTURE YOU WOULD EXPECT FOR GROUND MAPPING. F/O SIDE SHOWS NORMAL. GROUNDED - YES. PERFORMED BITE TEST OF WEATHER EADAR (WXR) SYSTEM REF B737-900 AMM 34-43-00-710-802-001 AND FOUND EFIS MODE/NAV FREQ DISAGREE ON F/O SIDE CORRECTED BY ENTER THE SAME FREQUENCY ON CAPTAIN SIDE, OPS NORMAL. OK FOR SVC.

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