# SDR CALA2026051116115

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 9, 2026
- Submitted: May 11, 2026
- Operation: Air carrier
- Aircraft: [N794UA](https://openairdocs.org/aircraft/N794UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26953
- Aircraft time: 114,850 hours, 15,000 cycles
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Relay
- Condition: Faulted
- Location: Zone 900
- Stage of operation: NR
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026051116115

## Discrepancy

AHM DETECTED MMSG {21-11121 *RELAY (CHILLER BOOST FAN) IN P210 IS NOT IN COMMANDED POSITION* AFTER WORK WAS ACCOMPLISHED DUE TO A SMOKE ODOR CONDITION. REF FIM 21-26- 804 TO PERFORM STEPS G. (1)-(2). ENSURE TO REPORT ON C/B 21307 STATE AND WIRE CONDITION. REPLACE C/B AND OR RELAY AS REQ'D.  CARRIED BY ELB REF FIM 21-26 TASK 804 REPLACE THE CHILLER BOOST FAN RELAY, K21264, IN THE P210 PANEL PERFORMED TEST 21 EVIREMENTAL SYSTEM PASSED. CONFIRMED CB AND CHILLER BOOST FAN OPS CHECK OK.

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