# SDR SWAA2017081415646

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 13, 2017
- Submitted: August 14, 2017
- Operation: Air carrier
- Aircraft: N7842A
- Make and model: Boeing 737-73V
- Registry model: [Boeing 737-73V](https://openairdocs.org/model/boeing-737-73v) (OpenAirDocs)
- Aircraft serial: 30237
- Aircraft time: 46,929 hours, 29,397 cycles
- System (JASC): [3420 · Attitude and Direction Data System](https://openairdocs.org/jasc/3420)
- Part: Air Data Module
- Part number: HG2050AC07
- Part serial: 56013407
- Condition: Malfunctioned
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2017081415646

## Discrepancy

RIGHT INERTIAL REFERENCE SYSTEM FAULT LIGHT CAME ON IN FLIGHT FL380 LOST ALL NAVIGATION SYSTEMS,  BOTH CAPTAIN`S AND FIRST OFFICER`S SIDE.    AIR TURNBACK,  DECLARED EMERGENCY.  R & R THE RT AIR DATA INERTIAL REFERENCE UNIT IAW MM.

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