# SDR IPXA2021042768691

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2021
- Submitted: April 28, 2021
- Operation: Air carrier
- Aircraft: [N581UP](https://openairdocs.org/aircraft/N581UP), registered now
- Make and model: Boeing 747-44AF
- Registry model: [Boeing 747-44AF](https://openairdocs.org/model/boeing-747-44af) (OpenAirDocs)
- Aircraft serial: 25866
- Aircraft time: 117,665 hours, 19,606 cycles
- System (JASC): [2740 · Stabilizer Control System](https://openairdocs.org/jasc/2740)
- Part: Limit Switch
- Part number: 35EN234
- Condition: Out Of Rig
- Location: Stab Trim
- Stage of operation: CL
- How discovered: O
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2021042768691

## Discrepancy

EMERGENCY DECLARED - LANDED UNEVENTFULLY** ARFF ADVISED * NOTOC DELIVERED** ON CLIMB OUT EICAS MESSAGE STAB TRIM 2 & STAB TRIM 3. A/P DISCONNECTED UNABLE TO USE YOLK TRIM ALT TRIM WORKED.FOUND STAB TRIM ELEVATOR CONTROL ACUATED LIMIT SWITCHES OUT OF RIG. CHANGED 5814 & 5815 SWITCHES AND RIGGED IAW AMM 27-41-07-501 OPS CHECK GOOD AUTOMATIC STAB TRIM TEST OPS CHECK GOOD IAW AMM 22-10-00-715-165

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