# SDR SWAA970388

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 14, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N73SW](https://openairdocs.org/aircraft/N73SW), registered now
- Make and model: Boeing 737-2H4
- Registry model: [Boeing 737-2H4](https://openairdocs.org/model/boeing-737-2h4) (OpenAirDocs)
- Aircraft serial: 22673
- System (JASC): [2710 · Aileron Control System](https://openairdocs.org/jasc/2710)
- Part: Pcu Valve
- Part number: 450801
- Condition: Malfunctioned
- Location: Aileron Contl
- Stage of operation: CR
- Nature of condition: F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA970388

## Discrepancy

IN CRUISE, AUTOPILOT HAD 2 UNCOMMANDED HARDS ROLLS, ONE TO THE LEFT AND ONE TO THE RIGHT, ESTIMATED AT 20 TO 30 DEGREES.  AUTOPILOT DISENGAGED.  REPLACED B-SYSTEM AILERON PCU TRANSFER VALVE PER BOEING M/M.

---
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.