M-20 F Executive 21
Flight Crew Private; Flight Crew Instrument
Flight Crew Last 90 Days 20; Flight Crew Total 1035; Flight Crew Type 750
Confusion
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Issued Advisory / Alert
Airport; Chart Or Publication; Procedure; Human Factors
I received Taxi clearance from STS Ground to Runway 14 at A2. I repeated the clearance - I believe no hold short instructions were given to me. I was at the Z apron and confirmed with STS ground that I can go to A5; then A northbound to Runway 14. I used airport diagram on iPad for Taxi showing Taxiway A passing by threshold Runway 20 but not intersecting it!Upon passing by it and stopping on A2 (holding short of Runway 14); I was told by STS Ground I passed the threshold Runway 20. I believe no incursion occurred and don't remember any marks on Taxiway A prompting me to stop; but I believe it could be a possibly dangerous situation if plane was landing and pilot relying on airport diagram which shows Taxiway A not crossing Runway 20.
The reporter cannot recall any hold bars on Taxiway A for Runway 20 but states that they may exist and he just was not looking for them.
M20 pilot reports being cleared to taxi via Taxiway A at STS and hold short of Runway 14 at A2. Once holding short at A2 he is admonished by the Tower for crossing the extended center line of Runway 20 without a clearance to do so.