# SDR DXTA200500582

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2005
- Submitted: February 11, 2005
- Operation: Air carrier
- Aircraft: N903QS
- Make and model: Cessna 750
- Registry model: [Cessna 750](https://openairdocs.org/model/cessna-750) (OpenAirDocs)
- Aircraft serial: 7500162
- Aircraft time: 3,507 hours, 2,115 cycles
- System (JASC): [2200 · Auto Flight System](https://openairdocs.org/jasc/2200)
- Part: Aileron
- Condition: Oscillates
- Location: Left
- Stage of operation: CR
- How discovered: O
- Nature of condition: I
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DXTA200500582

## Discrepancy

DURING FLIGHT AT FL410 WITH AUTOPILOT ENGAGED, AIRCRAFT BEGAN 10 DEGREE LEFT AND RIGHT ROLL OSCILLATION WITH A 1 SEC TIME AMPLITUDE.  OSCILLATIONS CONTINUED FOR 18 MINS.  OPS ARE NORMAL WITH AP DISENGAGED.  DESCENDED TO FL360, RE-ENGAGED AP AND 5 MINS LATER AUTO PILOT ENGAGED AND OSCILLATIONS BEGAN AGAIN WITH CYAN CAS MESSAGE, AILERON RATIO LOW.  VISUALLY CONFIRMED AT LEAST LEFT AILERON OSCILLATING.  ALL HYD PRESS AND QTY NORMAL.  ITEM IS UNDER INVESTIGATION.

---
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.