Narrative:

I made an ILS approach to runway 28R at myf. After landing I was instructed by the tower to cross runway 28L and then contact ground control. I thought I had taxied off runway 28R onto taxiway G but instead I had taxied onto runway 23. I did not notice the hold line markings for runway 28L and I made a left turn onto runway 28L. When I turned onto what I thought was taxiway H, I switched my radio to 118.2, told ground controller I was clear of runway 28R and wanted to taxi to FBO. When I did not receive a reply, I checked the frequency and discovered I had set in the wrong frequency. I set in the correct frequency and made contact with ground control, who informed me that I had turned onto runway 28L. I exited runway 28L on taxiway D. My unfamiliarity with the airport, my inattn to my location on the airfield, neglecting to ask for taxi instructions from the tower, and mis-setting the proper radio frequency caused me to accidentally turn onto an active runway. I had the airport diagram with me in the cockpit and I should have referred to it before landing. Other factors that may have contributed to the incident were the low sun angle that obscured my vision, and fatigue due to the late afternoon arrival. I had recently taken and passed a runway incursion test online, and I feel I am up-to-date on airfield markings and signs, but I was in a hurry to exit the busy runway and failed to follow the proper taxi path.

Google
 

Original NASA ASRS Text

Title: C421 TAXIING TO THE RAMP AT MYF ENTERED RWY WITHOUT ATC APPROVAL.

Narrative: I MADE AN ILS APCH TO RWY 28R AT MYF. AFTER LNDG I WAS INSTRUCTED BY THE TWR TO CROSS RWY 28L AND THEN CONTACT GND CTL. I THOUGHT I HAD TAXIED OFF RWY 28R ONTO TXWY G BUT INSTEAD I HAD TAXIED ONTO RWY 23. I DID NOT NOTICE THE HOLD LINE MARKINGS FOR RWY 28L AND I MADE A L TURN ONTO RWY 28L. WHEN I TURNED ONTO WHAT I THOUGHT WAS TXWY H, I SWITCHED MY RADIO TO 118.2, TOLD GND CTLR I WAS CLR OF RWY 28R AND WANTED TO TAXI TO FBO. WHEN I DID NOT RECEIVE A REPLY, I CHKED THE FREQ AND DISCOVERED I HAD SET IN THE WRONG FREQ. I SET IN THE CORRECT FREQ AND MADE CONTACT WITH GND CTL, WHO INFORMED ME THAT I HAD TURNED ONTO RWY 28L. I EXITED RWY 28L ON TXWY D. MY UNFAMILIARITY WITH THE ARPT, MY INATTN TO MY LOCATION ON THE AIRFIELD, NEGLECTING TO ASK FOR TAXI INSTRUCTIONS FROM THE TWR, AND MIS-SETTING THE PROPER RADIO FREQ CAUSED ME TO ACCIDENTALLY TURN ONTO AN ACTIVE RWY. I HAD THE ARPT DIAGRAM WITH ME IN THE COCKPIT AND I SHOULD HAVE REFERRED TO IT BEFORE LNDG. OTHER FACTORS THAT MAY HAVE CONTRIBUTED TO THE INCIDENT WERE THE LOW SUN ANGLE THAT OBSCURED MY VISION, AND FATIGUE DUE TO THE LATE AFTERNOON ARR. I HAD RECENTLY TAKEN AND PASSED A RWY INCURSION TEST ONLINE, AND I FEEL I AM UP-TO-DATE ON AIRFIELD MARKINGS AND SIGNS, BUT I WAS IN A HURRY TO EXIT THE BUSY RWY AND FAILED TO FOLLOW THE PROPER TAXI PATH.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.