# SDR IPXA2026031245038

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 12, 2026
- Submitted: March 13, 2026
- Operation: Air carrier
- Aircraft: [N172UP](https://openairdocs.org/aircraft/N172UP), registered now
- Make and model: Airbus A300 F4-622R
- Registry model: [Airbus A300 F4-622R](https://openairdocs.org/model/airbus-a300-f4-622r) (OpenAirDocs)
- Aircraft serial: 0867
- Aircraft time: 24,837 hours, 14,756 cycles
- System (JASC): [2400 · Electrical Power System](https://openairdocs.org/jasc/2400)
- Part: Trans Rectifier
- Part number: F11QY3714
- Part serial: 1171
- Condition: Failed
- Location: Zone 100
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026031245038

## Discrepancy

DURING APU T/S WITH APU MASTER SWITCH SELECTED ON AND APU START SWICH SELECTED ON, AVIONICS COMPT FILLED WITH SMOKE AND FOUND ESS BUS AND ESS T/R SUPPLY 10XH CIRCUIT BREAKER TRIPPED OPEN.  INSPECTED CIRCUIT'S & COMPONENTS ASSOCIATED TO C/B 10XH FOR EVIDENCE OF FAILURE - OVERHEAT DAMAGE IAW AWM 24-52-01. REPLACED ESS TR 1PC IAW AMM 24-32-11-401, TR FANS OPS CK OK FOR ESS AND TR-2 PER AMM 24-32-00-501.

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