Narrative:

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 air data computer 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.

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Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 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.