# SDR SWAA2023010386959

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 1, 2023
- Submitted: January 3, 2023
- Operation: Air carrier
- Aircraft: N776WN
- Make and model: Boeing 737-7H4
- Registry model: [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4) (OpenAirDocs)
- Aircraft serial: 30591
- Aircraft time: 71,674 hours, 42,512 cycles
- System (JASC): [2740 · Stabilizer Control System](https://openairdocs.org/jasc/2740)
- Part: Bearing
- Condition: Oscillates
- Location: Zone  100
- Stage of operation: CL
- How discovered: 9
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2023010386959

## Discrepancy

ACCELERATING THROUGH 290KIAS AND CLIMBING AT 3500FPM.  A/C BEGAN STEADY OSCILLATIONS UP/ DOWN MOVEMENT. MAGNITUDE INCREASED WITH HIGHER SPEED. SLOWED A/C TO 280 KIAS AND REDUCED PITCH ATTITUDE TO ESTABLISH 100FPM CLIMB. OSCILATIONS CEASED DECELERATING THROUGH 290KIAS. AT 280KTS AND LEVEL FLIGHT NO UP/DOWN MOVEMENT FELT. AIRPLANE FLEW NORMALLY BELOW THOSE SPEEDS FOR REMAINDER OF FLIGHT BOTH MANUALLY AND WITH THE A/P ENGAGED. NO OTHER ABNORMALITIES NOTED.  R/R RIGHT SIDE CONTROL CRANK BEARING AND SLEEVE PER AMM 27-31-74.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.