# SDR CALA2026072017885

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 19, 2026
- Submitted: July 20, 2026
- Operation: Air carrier
- Aircraft: [N57016](https://openairdocs.org/aircraft/N57016), registered now
- Make and model: Boeing 777224
- Aircraft serial: 28679
- Aircraft time: 121,973 hours, 12,451 cycles
- System (JASC): [2433 · DC Rectifier/Converter](https://openairdocs.org/jasc/2433)
- Part: Relay
- Part number: HTC7N060
- Condition: Faulted
- Location: Tru
- Stage of operation: TX
- How discovered: O
- Nature of condition: B
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026072017885

## Discrepancy

CONDITIONAL INSPECTION REQUIRED FOLLOWING STRONG FUMES IN FLT DECK PLEASE FOLLOW TRM EC0500-01016 PERFORMED SMOKE IN CABIN/FLIGHT DECK INSPECTION IAW AMM 05-51-58-800-801-C3 UP TO STEP 1.C.(2)(L). NO OBVIOUS SOURCE FOR SMOKE FOUND.   POWER RAN. DID NOTE BRIEF 10 SECOND SMOKE ODOR WHEN ENGINES STOPPED & SYSTEMS TRANSFERED TO APU POWER. TRU C1 RELAY REPLACEMENT. COMPLETED AMM 05-51-58 C. AND E. PERFORMED ENGINE RUNS ISOLATING BLEED SOURCE, PACKS, AND RECIRC FANS REF AMM 71-00-00. NO ODOR PRESENT WITH APU BLEED AND PACKS AND RECIRCS ON FOR 2 PLUS HOURS WITH NO ENGINE OPERATION. PERFORMED PART POWER TEST AND ENVIRONMENTAL TESTS AS LISTED IN AMM 05-51-58. ONLY MILD SMELL OF EXHAUST OCCURS WHEN APU IS THE BLEED SOURCE ONLY AT ENGINE SHUTDOWN, ODOR INTENSITY CHANGES WITH WIND DIRECTION. REPLACED UPPER AN... R/R TRANSFORMER RECTIFIER UNIT C1 RELAY K24017 REF AMM 24-32-09 ALL TESTS PASSED, MSG CLEARED WITH NO ACTIVE FAULTS. REF TO LP 9657829 FOR THE STRONG FUMES IN THE ADD EMP:U409294,U393679 FLT DECK CONDITIONAL INSPECTION. PARTS USED: 75-2425-3-0002,QTY :1

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