# SDR UALA2009111803588

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 17, 2009
- Submitted: November 18, 2009
- Operation: Air carrier
- Aircraft: [N440UA](https://openairdocs.org/aircraft/N440UA), registered now
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 702
- Aircraft time: 41,524 hours, 16,286 cycles
- Engine: Iae V2527A5
- System (JASC): [3440 · Independent Position Determining System](https://openairdocs.org/jasc/3440)
- Part: Switch
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2009111803588

## Discrepancy

LOST ADR1, FLIGHT DIVERTED.  ALL INSTRUMENTS NORMAL UNTIL POWER UP. LOST ADR1...NAV.  ADR 1 FAULT DISCOVERED ADR 1 SWITCH.  HAS NO DETENT POSITION.  SUSPECT SWITCH CAME OUT OF NAV POS ON ITS OWN.  REPLACED ADIRU PANEL, ACCOMP CFDS ADIRU INTERFACE TEST.  A/C OKAY FOR SVC.

---
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.