# SDR 2013FA0000022

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 15, 2013
- Submitted: January 15, 2013
- Operation: General aviation
- Aircraft: N519M
- Make and model: Raythn HAWKER800XP
- Aircraft serial: 258747
- Aircraft time: 2,862 hours, 2,254 cycles
- System (JASC): [3120 · Independent Instruments](https://openairdocs.org/jasc/3120)
- Part: Display
- Part number: 392130001
- Part serial: M014997
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2013FA0000022

## Discrepancy

WHEN ESSENTIAL BUSS POWER IS LOST, THE ELECTRONIC STANDBY INSTRUMENT (ESIS) REBOOTS AS IT SWITCHES TO BACKUP BATTERY POWER.  THIS RESULTS IN A 3 MINUTE AND 20 SECOND DELAY WITH NO STANDBY INSTRUMENTATION.  THERE IS A RELAY IN THE CIRCUIT THAT SWITCHES BETWEEN ESSENTIAL BUSS AND BACKUP BATTERY POWER.  IN NORMAL OPERATION THERE IS A 'BLIP' IN THE DISPLAY AS IT SWITCHES POWER.  THIS UNIT COMPLETELY REBOOTED AS IT TRANSFERRED.

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