# SDR ASAA2018072325481

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 20, 2018
- Submitted: July 23, 2018
- Operation: Air carrier
- Aircraft: [N413AS](https://openairdocs.org/aircraft/N413AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35205
- Aircraft time: 21,169 hours, 6,911 cycles
- System (JASC): [3442 · Weather Radar System](https://openairdocs.org/jasc/3442)
- Part: Transceiver
- Part number: 8221710312
- Part serial: 4CXHF3
- Condition: Failed
- Location: Weather Radar
- Part time: 517 hours, 205 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018072325481

## Discrepancy

AT CRUISE RADAR HAS BEGUN TO SHOW SPIKES ON THE DISPLAY IN MANUAL MODE. SPIKES ARE INTERMITTENT AND VARY IN INTENSITY FROM MINIMAL TO QUITE DENSE. GROUNDED - YES. REMOVED AND REPLACED WEATHER R/T, TESTED NML REF AMM 34-43-41-00-801 & -400-801. ALSO OPERATED RADAR ON GROUND IN MAN MODE - DISPLAY HAD NO SPIKES.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.