# SDR USA2002F00041

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 20, 2002
- Submitted: June 13, 2002
- Operation: Air carrier
- Aircraft: N650US
- Make and model: Boeing 767201
- Aircraft serial: 23902
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Control Unit
- Condition: Malfunctioned
- Location: Electrical Load
- Part time: 59,344 hours
- Stage of operation: NR
- 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/USA2002F00041

## Discrepancy

(ELCU) ENROUTE, CREW RECEIVED THE EICAS MESSAGE (C HYD PRIM 1) AND THE LOW PRESSURE LIGHT ILLUMINATED.  FLIGHT RETURNED AND LANDED WITH NO FURTHER INCIDENT.  MAINTENANCE REPLACED THE CENTER NR 1 ACMP AND THEN THE TIME DELAY RELAY.  ON A SUBSEQUENT FLIGHT, THE PROBLEM REAPPEARED.  THE ELECTRICAL LOAD CONTROL UNIT WAS REPLACED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.