# SDR AALA202001079002

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 6, 2020
- Submitted: February 4, 2020
- Operation: Air carrier
- Aircraft: [N806NN](https://openairdocs.org/aircraft/N806NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 29561
- Aircraft time: 32,121 hours, 13,026 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Computer
- Part number: 05799819
- Part serial: 4804YX
- Condition: Faulted
- Location: Stab Trim
- Stage of operation: CR
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202001079002

## Discrepancy

AIRCRAFT NOT GROUNDED: STAB OUT OF TRIM ILLUMINATED AT LEVEL OFF FL350 WITH A A/P ENGAGED WITOUT WARNING AIRCRAFT  PITCHED DOWN AGGRESSIVELY WEN 800 FEET DOWN AUTO PILOT AND AUTO THROTTLE WERE MANUALLY  DISENGAGED USING TRIM SWITCH ON YOKE A/C RETURNED TO PROPER TRIM AS PER QRH AUTO PILOT AND A/T NOT USED FOR REMAINDER OF FLIGHT. MEL 22-01A. ***SUPPLEMENTAL ACTION SECT. 4 AND 5: REMOVED AND REPLACED FCC CH A ( #1) IAW AMM 22-11-33 PERFORMED LAND VERIFIED TEST IAW AMM 22-11-00-700-801.***(CLOSED)

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