# SDR UIEA200600274

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 7, 2006
- Submitted: October 19, 2006
- Operation: Air carrier
- Aircraft: [N408MC](https://openairdocs.org/aircraft/N408MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 29261
- Aircraft time: 33,757 hours, 5,194 cycles
- System (JASC): [2720 · Rudder Control System](https://openairdocs.org/jasc/2720)
- Part: Powerpack
- Part number: 3332001007
- Part serial: 0509
- Condition: Worn
- Location: Rudder
- Stage of operation: CR
- How discovered: O
- Nature of condition: E
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA200600274

## Discrepancy

ATB:DUE TO MEDIUM/LIGHT VIBRATION IN RUDDER PEDALS. FLIGHT CONTROL VALVES OFF BY 1. YAW DAMPER OFF NO HELP, A/P OFF NO CHANGES. FOUND UPPER RUDDER HYD RETRACT LINE "B" NUT AND UNION LOOSE BY 2.5 TURN WITH HEAVY LEAK. TIGHTEN BACK IAW MM 27-21-15 OPS AND LEAK CHECK SATIS.TRANSFERED A/C TO HKG WHERE MAINTENANCE PERFORMED BOEING RECOMENDED CHECKS, FOUND LOWER RUDDER POWER CONTROL UNIT BEARING WORN, REPLACED PCU OPS CHECK OK.

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