# SDR DALA2018040302143

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 1, 2018
- Submitted: April 3, 2018
- Operation: Air carrier
- Aircraft: N960DN
- Make and model: Doug MD-90-30
- Registry model: [Doug MD-90-30](https://openairdocs.org/model/mcdonnell-douglas-md-90-30) (OpenAirDocs)
- Aircraft serial: 53530
- Aircraft time: 52,910 hours, 27,907 cycles
- System (JASC): [2460 · DC Power Distribution System](https://openairdocs.org/jasc/2460)
- Part: Relay
- Condition: Failed
- Location: Power Transfer
- Stage of operation: TO
- How discovered: O
- Nature of condition: J
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2018040302143

## Discrepancy

DURING TAKE OFF, ENGAGED AUTO-THROTTLES AT 70 KNOTS. DC BUSS OFF MESSAGE APPEARED ON THE EPCU ANNUNCIATOR PANEL.  ALL OTHER SYSTEMS & INDICATIONS NORMAL BEFORE AND AFTER ATO.  PERFORMED NO GO ODI PREVENTION CHECK LIST.  FOUND DC EMERGENCY POWER TRANSFER RELAY R2-326 FAILED.  REPLACED THE RELAY.  OPS CHECKED NORMAL.

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