HS 125 Series 700
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 150; Flight Crew Total 17300; Flight Crew Type 2100
Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Environment - Non Weather Related
We were ferrying an aircraft to Africa. On an initial climb to 10;000 feet we were about to level off when the autopilot lurched up and the altitude hold had disengaged. By the time we were able to correct the problem ATC was asking us to stop our climb. We had climbed approximately 3-4 hundred feet rapidly before we were able to disengage the autopilot and return to level flight.We sincerely appreciate the controller's quick response to the matter. Nothing even close to that in Africa.After we leveled off and regained our altitude which was over in a few seconds; we did see a jet pass over us about 5;000 feet above us and several miles in front of us. The controller did a great job working with us.
HS 125 Series 700 Captain reported an altitude excursion probably caused by a wake vortex encounter.