# SDR 0003539941

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 27, 2000
- Submitted: October 4, 2000
- Operation: Air carrier
- Aircraft: N3324L
- Make and model: Doug DC-9-32
- Registry model: [Doug DC-9-32](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32) (OpenAirDocs)
- Aircraft serial: 47103
- Aircraft time: 84,987 hours, 87,547 cycles
- System (JASC): [2730 · Elevator Control System](https://openairdocs.org/jasc/2730)
- Part: Bearing
- Condition: Damaged
- Location: Rt Elevator
- Stage of operation: CR
- How discovered: O
- Nature of condition: E, F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/0003539941

## Discrepancy

AUTOPILOT PORPOISING IN CRUISE, VIBRATION IN CABIN FLOOR, AND KNOCKING SOUND IN REAR.  FLIGHT DECLARED AN EMERGENCY AS A PRECAUTION BUT LANDED AT MSP WITHOUT INCIDENT.  MAINTENANCE FOUND FOLLOW-UP BALANCE LINKAGE BEARINGS TO RIGHT ELEVATOR CONTROL TAB BINDING.  REPLACED FOLLOW-UP BALANCE LINKAGE BEARINGS AND RERIGGED TRIM.  OPERATIONAL CHECK OK.  AIRCRAFT RETURNED TO SERVICE.

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