# SDR 95ZZZX4611

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N1UC](https://openairdocs.org/aircraft/N1UC), registered now
- Make and model: Beech E-90
- Registry model: [Beech E-90](https://openairdocs.org/model/beech-e-90) (OpenAirDocs)
- Aircraft serial: LW140
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Inverter Harness
- Condition: Miswired
- Location: Ac Bus
- Stage of operation: IN
- Nature of condition: W
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/95ZZZX4611

## Discrepancy

DURING AN INSPECTION, A DUAL FEEDER BUS CONFORMITY TEST WAS PERFORMED.  THE INVERTER POWER HARNESS WAS FOUND WIRED TO THE WRONG BUSS (LT WIRED TO RT, AND VICE VERSA).  SHOULD THE 325-AMP ISOLATION LIMITER BECOME OPEN, BOTH INVERTERS WOULD FAIL.  THIS IS SECOND MODEL 90 THAT HAS BEEN WIRED IMPROPERLY.  A ONE-TIME INSPECTION OF THE INVERTER SYSTEM BY REMOVING ONE 325-AMP LIMITER AT A TIME AND CHECKING INVERTER OPERATION WHICH WOULD SHOW THE MISWIRING PROBLEM IF BOTH INVERTERS FAILED, NR 1 INVERTER SHOULD FAIL ONLY WHEN NR 1 LIMITER IS REMOVED.  SIMILAR RESULTS FOR NR 2 LIMITER REMOVAL.

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