# SDR CALA2024100100737

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 29, 2024
- Submitted: October 1, 2024
- Operation: Air carrier
- Aircraft: [N73860](https://openairdocs.org/aircraft/N73860), registered now
- Make and model: Boeing 757-33N
- Registry model: [Boeing 757-33N](https://openairdocs.org/model/boeing-757-33n) (OpenAirDocs)
- Aircraft serial: 32584
- Aircraft time: 60,940 hours, 17,763 cycles
- System (JASC): [2400 · Electrical Power System](https://openairdocs.org/jasc/2400)
- Part: Circuit Breaker
- Part number: B4301
- Part serial: CL53816
- Condition: Faulty
- Location: Zone 100
- Part time: 30,649 hours, 8,476 cycles
- Stage of operation: CL
- 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/CALA2024100100737

## Discrepancy

115 VAC BUS L SECT 1 BREAKER FOUND POPPED ON P31 PANEL.  REF WDM 24-51-11-06. DID NOT ATTEMPT RESET REPLACED C901 GCB REF AMM 24-22-03-424-006. INSPECTED #1 FIREWALL CONNECTOR D1016J AND D1116P. NO DEFECTS NOTED. INSPECTED LUGS ON IDG #1. INSPECTED WIRING TO C313 BUS LEFT SECTION 1. RESET BREAKER C313. RAN BOTH ENGINES FOR 10 MIN WITH FULL LOAD ON LH BUS. NO FAULTS NO MESSAGES. REF WDM 24-21-11 AND 24-51-11.

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