BAe 125 Series 800
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 39; Flight Crew Total 11000; Flight Crew Type 4500
Human-Machine Interface
Aircraft Equipment Problem Critical; Inflight Event / Encounter Bird / Animal
Flight Crew Became Reoriented; General Maintenance Action
Environment - Non Weather Related
Normal takeoff and initial climb through 3;500 FT Captain's airspeed indicator made a 30 knot jump to increased airspeed then back to normal (approximately 230 KTS). A slight wobble on altimeter as well but settled down through 5;000 FT. At level off of 8;500 MSL airspeed on Captain's side remained at 238 KTS; while Co-pilot's indication was increasing through 250 KTS to approximately 290 KTS. Made several power adjustments to trend airspeed/power settings; and confirmed with Captain's side ADC analog information on NZ 2000 that IAS was 40 KTS faster than indicated speed displayed on Captain's airspeed. Remaining VFR flight conducted using Co-pilot's information and display information from FMS; IDC read out. Normal landing with no issues on operation to ramp parking. Upon inspection of Captain's Pitot tube a 'thumb nail size' piece of carcass stuck in and around entrance of pitot tube area. Small bird possible; however no other sign of bird impact noticed. Maintenance removed pitot tube; cleaned [it]; and re-installed. Aircraft is scheduled for complete Pitot Static; RVSM re-cert and aircraft will not operate in RVSM airspace until all required inspections of system are completed.
HS125 Captain experiences unreliable airspeed indication climbing through 3;500 FT resulting in an overspeed upon leveling at 8;500 FT.  Post flight reveals that a small bird may have impacted the Captain's pitot tube.