# SDR IPXA2024103046577

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 2024
- Submitted: October 30, 2024
- Operation: Air carrier
- Aircraft: [N634UP](https://openairdocs.org/aircraft/N634UP), registered now
- Make and model: Boeing 747-8F
- Registry model: [Boeing 747-8F](https://openairdocs.org/model/boeing-747-8f) (OpenAirDocs)
- Aircraft serial: 37564
- Aircraft time: 30,334 hours, 4,533 cycles
- System (JASC): [2720 · Rudder Control System](https://openairdocs.org/jasc/2720)
- Part: Actuator
- Part number: 6013K000101
- Part serial: 18083961
- Condition: Faulted
- Location: Zone 300
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2024103046577

## Discrepancy

AIR TURN BACK,  RUDDER RATIO SINGLE EICAS MESSAGE. RESULTED IN ATB. REMOVED AND REPLACED UPPER RUUDER RATIO CHANGER ACTUATOR SERVO M520 IAW AMM 27-21-12, OPS CHECK GOOD MSG CLEARED. RIG PIN R4 REMOVED. C/W RII REQUIREMENTS, VERIFIED RIG PIN R4 REMOVED, REF GMM 04-02

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