# SDR CALA2026050816083

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 6, 2026
- Submitted: May 8, 2026
- Operation: Air carrier
- Aircraft: [N684UA](https://openairdocs.org/aircraft/N684UA), registered now
- Make and model: Boeing 767-3CB
- Registry model: [Boeing 767-3CB](https://openairdocs.org/model/boeing-767-3cb) (OpenAirDocs)
- Aircraft serial: 33466
- Aircraft time: 79,445 hours, 13,632 cycles
- System (JASC): [3421 · Attitude Gyro and Indicating System](https://openairdocs.org/jasc/3421)
- Part: Iru
- Part number: HG1050AD16
- Part serial: 2019
- Condition: Faulted
- Location: Right
- Part time: 81,727 hours, 16,122 cycles
- Stage of operation: CL
- 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/CALA2026050816083

## Discrepancy

RIGHT IRS FAULT EICAS PER FLT CREW DEBRIEF, HAD ATTITUDE DISAGREE EICAS, PITCH/ROLL DISPLAYED ON BOTH PFDS. F/OS SIDE PFD INDICATED A DESCENT WHILE THE A/C WAS CLIMBING. F/O SWITCHED TO LEFT SOURCE, AND PFD CORRECTED. ALSO GOT RT IRS EICAS. REMOVED AND REPLACED RIGHT IRU PER MM 34-21-01.  OPS CHECK GOOD. PERFORMED TEST 30 PER MM 22-00-02. TEST PASSED. A/C REMAINED FULL CAT CAPABILITY.

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