# SDR CALA2026022514062

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 22, 2026
- Submitted: February 25, 2026
- Operation: Air carrier
- Aircraft: [N57870](https://openairdocs.org/aircraft/N57870), registered now
- Make and model: Boeing 757-33N
- Registry model: [Boeing 757-33N](https://openairdocs.org/model/boeing-757-33n) (OpenAirDocs)
- Aircraft serial: 33525
- Aircraft time: 61,292 hours, 17,931 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Adiru
- Part number: HG2050AC11
- Part serial: 98060656
- Condition: Faulted
- Location: Left
- Stage of operation: CL
- How discovered: O
- Nature of condition: F
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026022514062

## Discrepancy

IN CLIMB AT FL290, AUTOPILOT DISENGAGED. NO MODES WOULD RE ENGAGE ACCOMPLISHED MCDP FCC TEST, TEST 30 & TEST 40. ALL TEST PASS. MCDP FLT FAULT WITH ADIRU LT.  REPLACED THE LT AIR DATA INERTIAL REFERENCE UNIT (ADIRU) IAW AMM 34-26-01/401.  PERFORMED MCDP TEST 30 IAW AMM 22-00-02-201.  GROUND RECERTIFICATION TEST PASSED.

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