# SDR 2023F00103

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 20, 2023
- Submitted: April 5, 2023
- Operation: General aviation
- Aircraft: [N820JL](https://openairdocs.org/aircraft/N820JL), registered now
- Make and model: Honda HA-420
- Registry model: [Honda HA-420](https://openairdocs.org/model/honda-ha-420) (OpenAirDocs)
- Aircraft serial: 42000140
- Aircraft time: 694 hours, 583 cycles
- System (JASC): [2450 · AC Power Distribution System](https://openairdocs.org/jasc/2450)
- Part: Pdu
- Part number: HJ112460103003
- Part serial: 1631300001
- Condition: Unknown
- Location: Zone 100
- Part time: 694 hours, 583 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2023F00103

## Discrepancy

THE #1 POWER DISTRIBUTION UNIT (PDU) FAILURE CAUSED A NUMBER OF CREW ALERT SYSTEM (CAS) MESSAGE. THIS FAILURE TRIGGERED A SERIES OF CASCADING
ELECTRICAL SIGNAL FAILURES TO NUMEROUS AIRCRAFT SYSTEMS, CULMINATING IN THE HYDRAULIC SYSTEMS PRESSURIZATION SIGNALS BEING LOST. A SUBSEQUENT LOSS OF
HYDRAULIC PRESSURE RESULTED AND A MANUAL LANDING GEAR EXTENSION PROCEDURE WAS EXECUTED. THE AIRCRAFT LANDED UNEVENTFULLY AT KBOI.

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