# SDR DLM88960831

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 4, 1996
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N904DL
- Make and model: Doug MD-88
- Registry model: [Doug MD-88](https://openairdocs.org/model/mcdonnell-douglas-md-88) (OpenAirDocs)
- Aircraft serial: 49535
- System (JASC): [2740 · Stabilizer Control System](https://openairdocs.org/jasc/2740)
- Part: Spring
- Condition: Missing
- Location: Stab Trim
- Stage of operation: CL
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DLM88960831

## Discrepancy

LEFT CAPTAINS AUTO PILOT COMMANDED AN UNCONTROLLED NOSE UP TRIM DURING CLIMB.  ADDITIONALLY, IT COMMANDED A CLIMB WHEN LEVEL AT CRUISE.  FOUND DETENT ROLLER SPRING MAIN HORIZONTAL STAB TRIM RELAY UPPER SPRING MISSING.  REPLACED SPRING AND RAN STAB, OPERATION NORMAL.

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