Light Transport; Low Wing; 2 Turbojet Eng
Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 152; Flight Crew Total 6865; Flight Crew Type 1246
Situational Awareness
Airspace Violation All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Returned To Clearance
Human Factors
During climb and in communication with LA Center; we had been on a heading with the autopilot flying in HEADING mode when we were cleared direct to SLAPP intersection. I was the PNF and did input the DIRECT to SLAPP into the FMS; and engaged NAV mode on the autopilot. I assume it was at this time; inadvertently and unknown to me that the Auto Sequencing mode of the FMS was switched to inhibited; which cancels the waypoint sequencing. We flew over SLAPP and instead of the slight right turn to YAPPI; we continued on the course that had taken us direct to SLAPP. As we were climbing through FL271 on the way to FL330; LA Center issued an immediate heading 120; as we had flown off our course and were nearing R-2515; having penetrated their 3 mile buffer zone. We complied immediately and proceeded with the controller's instruction to resume course. Better due diligence on my part; along with my now understanding the ease of which the FMS can be taken out of Auto sequencing has corrected the situation. Factors likely include my focus on ATC instead of our situation. Fatigue was not a factor as this was the first flight of the day after spending most of the day in the hotel. After speaking with the ATC manager concerning the possible pilot deviation; I was told that the issuing controller was able to contact Josh Approach to get us a 'point out approved'; which also was approved with the military. We were in R2515 for about 15 miles and from FL271 until we exited at FL316. Our airspeed was 250 KIAS.
[Report narrative contained no additional information.]
Air taxi flight crew reported they almost entered a restricted area when the FMS was mistakenly switched to inhibited mode which cancels waypoint sequencing.