# SDR CALA2026080418250

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 5, 2026
- Submitted: August 5, 2026
- Operation: Air carrier
- Aircraft: [N28912](https://openairdocs.org/aircraft/N28912), registered now
- Make and model: Boeing 787-8
- Registry model: [Boeing 787-8](https://openairdocs.org/model/boeing-787-8) (OpenAirDocs)
- Aircraft serial: 34828
- Aircraft time: 48,953 hours, 5,948 cycles
- System (JASC): [2700 · Flight Control System](https://openairdocs.org/jasc/2700)
- Part: Control Unit
- Part number: CA72711006
- Part serial: 635
- Condition: Faulted
- Location: Right
- Part time: 34,167 hours, 4,223 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026080418250

## Discrepancy

STABILIZER R2 ADVISORY THIS MESSAGE IS SET WHEN THE R2 CONTROL CHANNEL NOT AVAILABLE FOR TRIM OR WHEN 1ST OFFICER'S TRIM SWITCH HAS BEEN DISAB LED BY COLUMN CUTOUT. R2 REFERS TO ELECTRICAL BUS. DB 27 FCM OPS (RIGHT) DB 27 FCM OPS (CENTER) DB 27 FCM OPS (LT) DEBRIEF CREW SAID AT 37K FL EICAS MESSAGE STAB R2, ALONG WITH STAB CHANNEL STATUS MESSAGE. CREW FOLLOWED CHECKLIST TURN STAB TRIM TO CUTOUT. RETURN STAB R2 SWITCH TO NORMAL NO MAINTENANCE MESSAGE ACTIVE. MX MESSAGES FOUND ON FAULT HISTORY AT CRUISE LEG 0, 27-12742, 27-19306. BY TOMC REQUEST REPLACE RT EMCU.  FOLLOWED FIM FOR MX MSG 27-12742 REF 27-40-F1-02A-421A-A, PERFORMED 27 PRIMARY FLIGHT CONTROL SYSTEM, SYSTEM TEST, HORIZONTAL STABILIZER, TEST PASSED.  RT ELECTRIC STAB FOUND CLOSED.  NEXT STEP, REPLACE RIGHT EMCU. R & R RT HORIZONTAL TRIM ACTUATOR ELECTIRC MOTOR CONTROL UNIT IAW AMM 27-41-08 & FIM 27-40-F1-02A-421A. OPS CHECK GOOD AND MESSAGE WENT AWAY.

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