# SDR CALA2026080518331

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 4, 2026
- Submitted: August 6, 2026
- Operation: Air carrier
- Aircraft: [N76054](https://openairdocs.org/aircraft/N76054), registered now
- Make and model: Boeing 767424ER
- Aircraft serial: 29449
- Aircraft time: 99,986 hours, 14,153 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 4052506955
- Part serial: 8249
- Condition: Faulty
- Location: Left
- Part time: 93,609 hours, 16,957 cycles
- Stage of operation: CR
- 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/CALA2026080518331

## Discrepancy

DURING CRUISE,  FLT AT F340-CPT MAP SCREEN BLANKS.  CAPT FMC SHUT OFF. F/O MAP SCREEN BLANKS. A/P DESCENT AUTO THROTTLES DSC . ACFT CLIMBED AND BANKED MCP BUTTONS STOPPED DID NOT RSPND. EFIS CTL . F/O NAV DATA AND FLT PLAN DISAPPRD FROM SCREEN. NUMEROUS CAUTION LEVEL EICAS MSGS APPEARED.  MCP EVENTUALLY RESPONDED RT A/P ENG D-A/T WERE SLOW TO ACTIVATE WITH MULTPLE SPEED BUTTON PRESSES ACTIVITIES. WHILE HAND FLYING EICAS MESSGES DISAPPEARED. TOMC+DISP CONSLTED . CRW DIVERTED. OVWT LNDING... CAPT MAP SCREEN BLANKS AND FMC SHUT OFF SUPECTING INTERMITTEN FAULT, REPLACE FMC LT AS A PRECAUTION.  TEST 30 & 40 CARRIED OUT IAW FIM 22-03 FT818 AND FT821 TEST PASSED FMC LT R & R IAW AMM 34-61-01/401, ALL 3 AUTOLAND TEST CARRIED OUT IAW FIM 22-03 FT821 WITH ALL 3 PASSED. AUTOLAND STATUS RETAINED TO FULL CAPABILITY. A-T TESTED PER FIM 22-03 FT810 TEST PASSED L FMC COMPUTER TO BE REPLACED DUE TO FMC ISSUES X-REF LP 9848769 COMPUTER, FLT M OFF 19-3461-9-0004 8249 ON 19-3461-9-0004 4719 COMPUTER, FLT M OFF 19-3461-9-0004 8249 ON 0000 L FMC REPLACED IAW AMM 34-61-01 SATISFACTORY. SOFTWARE VERSIONS VERIFIED SATISFACTORY

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