Narrative:

We were in the process of delivering an organ. Center cleared us for a visual approach at ZZZ to runway 18. Center then canceled our IFR flight plan and then we were told to contact the local CTAF frequency. Also, before center gave us permission for a visual, we listened to ATIS. ATIS had informed us that the south side of the airport was currently being used for military operations. On the contrary, my captain may have been a little confused about the information which was being broadcasted by ATIS. We landed on runway 18 and after our rollout, we back taxied for an appropriate turnoff taxiway. We cleared runway 18 by making a right turn onto the taxiway. At that time, I was very familiar with my surroundings and I continued to help/assist my captain as always. Furthermore, due to my past aviation training and military background, I knew that we should not taxi across the parking ramp of the military. The captain, however, proceeded to taxi towards their ramp. I then informed the captain that without permission, we could get violated and that the property belongs to the united stated military. However, the captain was under the understanding that because he saw a sign that said ramp, it was ok to use the military ramp to taxi to parking at the civilian FBO. I then firmly, but tactfully, stated 'we could get an FAA violation because we were not cleared to go across their ramp.' he continued to taxi straight ahead and past the next taxiway, onto the military ramp. At that moment and before I could even blink an eye, security police (sp) appeared off of our right wing. I informed the captain of the security police's presence and while taxiing, we came upon a concrete type wall or barricade, that separated the military ramp from the FBO's ramp. The captain then turned the aircraft around and stopped it. The security police called the airport manager/authority/authorized. While I sat in the aircraft, the captain talked with the security police. The airport manager/authority/authorized then escorted the captain and I over to the FBO. Cause of taxi intrusion: the airport diagram does not depict the FBO area and military property being separated by a barricade. Also, the airport diagram does not depict the location of the FBO. The tower was closed in our case. Corrective action: I would like to see more detail on the airport diagram, in relation to areas that civilian aircraft should not operate in or around, where military air bases are concerned.

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Original NASA ASRS Text

Title: FLC AFTER LNDG AT CTAF ARPT WITH TWR CLOSED, TAXIES INTO MIL RESTR AREA.

Narrative: WE WERE IN THE PROCESS OF DELIVERING AN ORGAN. CTR CLRED US FOR A VISUAL APCH AT ZZZ TO RWY 18. CTR THEN CANCELED OUR IFR FLT PLAN AND THEN WE WERE TOLD TO CONTACT THE LCL CTAF FREQ. ALSO, BEFORE CTR GAVE US PERMISSION FOR A VISUAL, WE LISTENED TO ATIS. ATIS HAD INFORMED US THAT THE S SIDE OF THE ARPT WAS CURRENTLY BEING USED FOR MIL OPS. ON THE CONTRARY, MY CAPT MAY HAVE BEEN A LITTLE CONFUSED ABOUT THE INFO WHICH WAS BEING BROADCASTED BY ATIS. WE LANDED ON RWY 18 AND AFTER OUR ROLLOUT, WE BACK TAXIED FOR AN APPROPRIATE TURNOFF TXWY. WE CLRED RWY 18 BY MAKING A R TURN ONTO THE TXWY. AT THAT TIME, I WAS VERY FAMILIAR WITH MY SURROUNDINGS AND I CONTINUED TO HELP/ASSIST MY CAPT AS ALWAYS. FURTHERMORE, DUE TO MY PAST AVIATION TRAINING AND MIL BACKGROUND, I KNEW THAT WE SHOULD NOT TAXI ACROSS THE PARKING RAMP OF THE MIL. THE CAPT, HOWEVER, PROCEEDED TO TAXI TOWARDS THEIR RAMP. I THEN INFORMED THE CAPT THAT WITHOUT PERMISSION, WE COULD GET VIOLATED AND THAT THE PROPERTY BELONGS TO THE UNITED STATED MIL. HOWEVER, THE CAPT WAS UNDER THE UNDERSTANDING THAT BECAUSE HE SAW A SIGN THAT SAID RAMP, IT WAS OK TO USE THE MIL RAMP TO TAXI TO PARKING AT THE CIVILIAN FBO. I THEN FIRMLY, BUT TACTFULLY, STATED 'WE COULD GET AN FAA VIOLATION BECAUSE WE WERE NOT CLRED TO GO ACROSS THEIR RAMP.' HE CONTINUED TO TAXI STRAIGHT AHEAD AND PAST THE NEXT TXWY, ONTO THE MIL RAMP. AT THAT MOMENT AND BEFORE I COULD EVEN BLINK AN EYE, SECURITY POLICE (SP) APPEARED OFF OF OUR R WING. I INFORMED THE CAPT OF THE SECURITY POLICE'S PRESENCE AND WHILE TAXIING, WE CAME UPON A CONCRETE TYPE WALL OR BARRICADE, THAT SEPARATED THE MIL RAMP FROM THE FBO'S RAMP. THE CAPT THEN TURNED THE ACFT AROUND AND STOPPED IT. THE SECURITY POLICE CALLED THE ARPT MGR/AUTH. WHILE I SAT IN THE ACFT, THE CAPT TALKED WITH THE SECURITY POLICE. THE ARPT MGR/AUTH THEN ESCORTED THE CAPT AND I OVER TO THE FBO. CAUSE OF TAXI INTRUSION: THE ARPT DIAGRAM DOES NOT DEPICT THE FBO AREA AND MIL PROPERTY BEING SEPARATED BY A BARRICADE. ALSO, THE ARPT DIAGRAM DOES NOT DEPICT THE LOCATION OF THE FBO. THE TWR WAS CLOSED IN OUR CASE. CORRECTIVE ACTION: I WOULD LIKE TO SEE MORE DETAIL ON THE ARPT DIAGRAM, IN RELATION TO AREAS THAT CIVILIAN ACFT SHOULD NOT OPERATE IN OR AROUND, WHERE MIL AIR BASES ARE CONCERNED.

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.