# SDR ASAA2021071035337

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2021
- Submitted: July 12, 2021
- Operation: Air carrier
- Aircraft: [N586AS](https://openairdocs.org/aircraft/N586AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35189
- Aircraft time: 49,606 hours, 14,974 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Control Panel
- Part number: 8221567102
- Part serial: 40LD8C
- Condition: Faulted
- Location: Cockpit
- Part time: 28,068 hours, 8,227 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021071035337

## Discrepancy

SHORTLY AFTER T/O LOUD CLICKING SOUND COMING FROM MCP PANEL. RAPID CLICKING LASTED APPROX 2MIN. AUTO PILOT B & AUTO THROTTLE ON. ALL OTHER INDICATIONS NORMAL. TURNED OFF AUTO B & AUTO THROTTLE, LATER CLICKING RETURNED BUT MUCH SLOWER, LASTED COUPLE MINUTES. THEN RETURNED W/ RAPID CLICKING, NO SMOKE OR ELECTRICAL SMELL AT ANYTIME. GROUNDED - YES. DIVERSION TIME 29 MINUTES - REMOVED AND REPLACED MCP REF B737-800 AMM 22-11-34. OPS NORMAL. REF AMM 22-11-34. LLM TEST ACCOMPLISHED REF AMM 22-11-00. CHECKS GOOD. A/C REMAINS CAT IIIA, HGS QUALIFIED.

---
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.