# SDR GLBA2017100400686

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 2, 2017
- Submitted: October 4, 2017
- Operation: Air carrier
- Aircraft: N96ZK
- Make and model: Emb EMB-120ER
- Registry model: [EMB EMB-120ER](https://openairdocs.org/model/embraer-emb-120er) (OpenAirDocs)
- Aircraft serial: 120096
- System (JASC): [2460 · DC Power Distribution System](https://openairdocs.org/jasc/2460)
- Part: Circuit Breaker
- Condition: Failed
- Location: Electrical Sys
- Stage of operation: DE
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/GLBA2017100400686

## Discrepancy

THE CREW REPORTED THAT THE EMERGENCY BUSS OFF LIGHT ILLUMINATED DURING DESCENT.  THE ISSUE WAS ISOLATED TO EMERGENCY DC BUSS NR 2 FAILURE. EXTENDED GEAR BY ELECTRICAL OVERRIDE. AN EMERGENCY WAS DECLARED PRIOR LANDING.   MAINTENANCE INSPECTED WIRING & COMP IN LT DC RELAY BOX & EMERGENCY DC 2 AREA. NO DEFECTS NOTED.  R & R THE CIRCUIT BREAKERS 0470,  IAW MM 24-52-05. PERFORMED OPS CHECK OF EMERGENCY BUSS 2, PERFORMING COMPLETE EMERGENCY TRANSFER FUNCTION OPERATIONAL TEST IAW MM 24-52-00 (5)(A)(B).  ALL CHECKED GOOD, NO DISCREPANCIES NOTED.

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