Hawker 900
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Rejected Takeoff
Aircraft
This was the first flight of the tour for both pilots; and we picked up our airplane out of maintenance. Taxied for takeoff on a short ferry flight. I was the flying pilot. During the takeoff roll; shortly after the 80 knot call to which I responded 'my controls'; I heard the abort callout; so I initiated an abort; catching sight of an abnormal KIAS boxed annunciator on my PFD. I also noted our speed deceleration thru the mid-90s knot range. We were cleared off the runway; I asked my partner what we had exactly; and he described a sizable difference in our indicated speeds; nearly 30 knots. We stopped; cleaned up; talked to ground control; and taxied very slowly back into the ramp. No debris was found in the pitot tubes or static ports on the post flight.I think we handled this well for the most part. We discussed abort criteria after returning to the ramp; and whether a gross discrepancy in indicated airspeeds qualifies as an abort criteria at the speed at which it was detected. I was a little slow in initiating the abort- the call for it wasn't very loud- more a headset/communication issue; so it took a second to absorb the abort command. Perhaps it was a very normal response time when out on the road and considering our normal expectations/biases of a normal takeoff.
We were on our Takeoff roll and everything was normal. I was the non-flying Pilot monitoring the instruments from the right seat. I did my normal scan of all three airspeed indicators prior to announcing 80 knots. All three were in agreement and I proceeded to announce 80 knots. At that time we did the normal transfer of controls from right seat to left seat (PF). Shortly after that; I noticed the amber IAS mis-compare appear on my PFD. I crosschecked my airspeed indicator with the left side airspeed indicator and noticed that the left side was reading approximately 88 knots and the right side airspeed indicator was reading approximately 110 knots. At that time I announced Abort Abort Abort. The PIC executed the Abort per SOPs prior to V1. We then proceeded to taxi off of the runway without incident and parked at our departure FBO.
HS125-900XP flight crew reported a rejected takeoff due to a difference in the airspeed indicators.