HS 125 Series
Flight Crew Air Transport Pilot (ATP)
Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed
Procedure; Human Factors; Aircraft
Picked up Aircraft X out of maintenance written up by another crew for various items; but none related to avionics. When preflighting the aircraft; in cockpit on Circuit Breaker panel behind co-pilots seat; found the Avionics Master Feeders PS1 CB popped and on the Avionics Master Bypass switches; found the PS1 and PS2 switches selected on. These are items normally not used by pilots. I am concerned this situation may have be done when a 3rd party vendor located out of ZZZ1did when working the airplane and didn't reset the condition they were doing. Either way; with no history on the airplane; we wrote it up for maintenance to troubleshoot.
Hawker 900 Captain reported that an outside vender did not properly return the aircraft to a serviceable condition after completing maintenance.