Small Aircraft; High Wing; 1 Eng; Fixed Gear
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 103; Flight Crew Total 6545; Flight Crew Type 1200
Troubleshooting; Confusion
Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown; Ground Incursion Runway
Flight Crew Became Reoriented; Flight Crew Requested ATC Assistance / Clarification
Airport; Environment - Non Weather Related
The hold short markings at the approach end of Runway 27 are blacked almost all the way out due to dirt or other material (actually look as though they have blanked out).Applicant wasn't sure if it was the actual hold short line.  Looking at the lines I wasn't sure those were the hold short lines; due to the lack of distinction; I looked to see if there were any closer to runway and didn't see any so knew these should be them.Applicant turned aircraft around quickly once he figured it out and the wing may have crossed the line. There were no communications from the Tower or Ground controllers about the aircraft position.Recommend that the hold short lines be cleaned or repainted as needed so as to prevent confusion as to the distinction of the lines.
Pilot Examiner reported a runway incursion at OMN airport and cited worn hold short lines as a contributing factor.