Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Confusion; Distraction; Human-Machine Interface
Aircraft Equipment Problem Critical; Deviation - Speed All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed
Aircraft; Human Factors
On takeoff; I made the standard callouts and at Vlof (98) I rotated and the aircraft did not fly. We were too slow. I sped up and took off and as I was climbing out the airspeed was varying between 120 and 140. At this time; I noticed the VSI was not indicating and as I climbed the altimeter was unreliable. It was jumping up and down about 200 Ft at a time. I was handed off to departure.When I got to departure I requested to return to the field. It was VMC. The controller asked if I need the trucks and I declined. They cleared me for the visual to Runway XX and switched to me to tower. Tower cleared me to land on Runway XYR. I landed without incident but the airspeed never dropped below 120 until my GPS was showing me going 30 Knots.
A Cessna 402C pilot had erroneous indications from his airspeed indicator as well as his VSI and altimeter just after takeoff. He elected to return to the field and landed without incident.