Super King Air 200
Air Traffic Control Fully Certified
Communication Breakdown; Situational Awareness
Airspace Violation All Types; Deviation - Altitude Excursion From Assigned Altitude; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Issued New Clearance
Human Factors; Procedure; Weather
I was called on the frequency by a King Air 200 stating he was on the ground and ready to depart. I then asked if he was familiar with [the SID] departure procedure. He said affirmative and I couldn't understand it; but my D-Side said he thought he said yes; so I again asked and the pilot stated affirmative. I then gave the clearance via [the SID] departure procedure direct to [the VOR]; and then direct. When the pilot called after he departed he stated he was out of 2;400 on [the SID] departure; I then saw his code and it was headed right for [restricted airspace]. I think I asked if he was direct to [the VOR] now and he then said he was direct [to the VOR]. He clearly wasn't though as he was still tracking towards [restricted airspace] so I stated turn left heading 360 to get out of the restricted area. This turn never happened; and it appeared he started turning right; or just circling. Then the pilot stated something like; 'Something weird is going on.' and we noticed his altitude dropped to 2;400; and then rose to 4;400. I then climbed him to his requested final of FL200. I hadn't climbed him initially because my first idea was to get him out of [restricted airspace]. I noticed he was turning right heading about 240 or so I told him to fly heading 270. At this point I just tried to get him out of [restricted airspace] and he hadn't taken the previous turn instructions but I thought maybe an updraft had stopped that turn. Finally; once he was out and established towards his destination I asked him if his statement about something weird going on was referring to weather which he stated affirmative. I then gave him the possible pilot deviation information. Now that I think about; it I don't know if I actually told him RADAR contact. The D-Side asked if I thought we should have him squawk 7700; but I was afraid of giving the pilot anything else to do. My first concern was him controlling the aircraft since he had not complied with turn instructions. I imagine the weather prevented his initial turn on the [SID] and then scared the pilot further causing him to get even more flustered when he realized he was in [restricted airspace].
Enroute Controller described a Restricted Area incursion by an IFR aircraft departing a non-towered airport and assigned a procedures that would have cleared the restricted airspace.