# SDR CALA2026020513602

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 3, 2026
- Submitted: February 5, 2026
- Operation: Air carrier
- Aircraft: [N647UA](https://openairdocs.org/aircraft/N647UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25284
- Aircraft time: 131,503 hours, 20,340 cycles
- System (JASC): [2230 · Auto Throttle System](https://openairdocs.org/jasc/2230)
- Part: Computer
- Part number: 937E205G3
- Part serial: 82C0072
- Condition: Faulted
- Location: Zone 100
- Part time: 715,014 hours, 702,125 cycles
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026020513602

## Discrepancy

AUTO THROTTLE FAILED TO ENGAGE AFTER 2 ATTEMPTS . AUTOTHROTTLE D ISC  EICAS MSG. FOLLOWING FIM 22-02 TASK 801 PERFORMED MCDP TEST 30 REF FIM 22-03 FAULT TREE 818, NO FAULTS FOUND. ADD EMP:U104370 REF L/P 7813942 RUDDER RATIO ON OVERHEAD PANEL FLASHED DURING AUTOTHROTTLE MAL FUNCTION. BITE CHECK RUDDER RATIO CHANGER MODULES FOR FAULT BALLS. REF FIM TASK 27-09-00-815-814 "MODULE FAULT" FAULT BALL FOUND SET ON RIGHT RUDDER RATIO CHANGER MODULE PERFORMED RUDDER RATIO BITE REF FIM 27-09 FAULT TREE 814, FOUND MODULE FAULT LIGHT ILLUMINATED BUT WENT OUT AT COMPLETION ON TEST. REPLACED RRCM AS PRECAUTIONARY REF AMM 27-09-00, PERFORMED RUDDER AND RUDDER TRIM CONTROL SYSTEM TEST REF AMM.

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