A LEAR 25 WAS INSPECTED BY AN FAA SAFETY INSPECTOR WITHOUT THE CREW PRESENT. INSPECTOR FOUND DISCREPANCIES MAKING THE ACFT UNAIRWORTHY.

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I WAS ASSIGNED A FLT AS PIC GOING FROM ADS TO FTW TO PICK UP FREIGHT IN AN LR-JET 25. THE FREIGHT WAS TO BE DELIVERED TO THE FINAL DEST OF ZZZ. THE FUEL STOP THAT WAS PLANNED AND USED BTWN FORT WORTH AND ZZZ WAS EL PASO; THE LAST POINT OF DEP PRIOR TO LNDG AT ZZZ. ALTHOUGH THIS SERIES OF FLTS BEGAN AND ENDED WITHOUT INCIDENT; I HAVE REASON TO BELIEVE THAT THESE FLTS WILL BE INVESTIGATED. AFTER COMPLETING THE AFOREMENTIONED FLTS; OUR ACFT WAS INSPECTED AT ZZZ (WITHOUT CREW PRESENT); BY AN FAA AVIATION INSPECTOR FROM THE ZZZ FSDO. THE INSPECTOR FOUND; WHAT HE BELIEVED TO BE; FAULT WITH THE ACFT THAT WOULD RENDER THE ACFT UNAIRWORTHY. NO FURTHER OP OF THE ACFT; IN STATED CONDITION; OCCURRED ONCE THIS INSPECTION TOOK PLACE. IT IS MY UNDERSTANDING THAT THE FAA INVESTIGATION MAY INVOLVE RESEARCHING HOW MY DETERMINATION OF AIRWORTHINESS BEFORE FLT WAS MADE. BEFORE FLT; I CHKED FOR ANY PREVIOUSLY RECORDED DISCREPANCIES AND FOUND NONE THAT HAD NOT BEEN CORRECTED AND SIGNED OFF BY A QUALIFIED MECH. I ALSO CONFIRMED THAT ALL REQUIRED DOCUMENTATION WAS ABOARD THE ACFT; AND THAT THE ACFT STATUS SHEET SHOWED THAT THE ACFT WAS IN FULL COMPLIANCE WITH ALL REQUIRED INSPECTIONS. DURING THIS SERIES OF FLTS; I DELEGATED PREFLT AND POSTFLT DUTIES TO MY EXPERIENCED FO. NO DISCREPANCIES WERE NOTED OR RPTED TO ME AFTER HAVING COMPLETED THE CHKS; AND NONE WERE FOUND BY MY FO. THERE WAS NEVER ANY INTENTION TO; NOR WAS FLT BEGAN WITH KNOWLEDGE OF ANY DISCREPANCY THAT WOULD RENDER THE ACFT UNAIRWORTHY. IF EVER SUCH A DETERMINATION IS MADE THAT THERE WERE PRE-EXISTING DISCREPANCIES I BELIEVE THAT HAVING TO PERFORM THE PREFLT AND POSTFLT INSPECTIONS AT NIGHT ON UNLIGHTED AND/OR POORLY LIT RAMP AREAS WOULD HAVE BEEN A CONTRIBUTING FACTOR. I ALSO BELIEVE THAT; IF EVER SUCH A DETERMINATION IS MADE THAT THERE WERE PRE-EXISTING DISCREPANCIES I BELIEVE THAT HAVING TO PERFORM THE PREFLT AND POSTFLT INSPECTIONS AT NIGHT ON UNLIGHTED AND/OR POORLY IT RAMP AREAS WOULD HAVE BEEN A CONTRIBUTING FACTOR. I ALSO BELIEVE THAT; IF EVER SUCH A DETERMINATION IS MADE THAT THERE WERE PRE-EXISTING DISCREPANCIES; THAT THE ACFT'S DIRTY EXTERIOR WOULD HAVE MADE IT DIFFICULT TO FIND; IN NORMAL PREFLT OR POSTFLT INSPECTIONS; THE DISCREPANCIES IN QUESTION.