Date: 201903
Local time of day: 0001-0600
Location: SJC.Airport, CA
Flight conditions: VMC
Light: Daylight
Aircraft: Light Transport
Operator: Corporate
Operating under: Part 135
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class C SJC
ATC / advisory: TRACON NCT
Reporter organization: Corporate
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Confusion; Situational Awareness
Second reporter function: Pilot Not Flying; Captain
Anomaly: Deviation - Speed All Types; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued Advisory / Alert; Flight Crew Became Reoriented; Flight Crew Requested ATC Assistance / Clarification
Contributing factors: Airspace Structure; Chart Or Publication; Human Factors; Procedure
Primary problem: Airspace Structure

Narrative: It was the first leg of the day for the crew. We were assigned the TECKY3 RNAV departure.  We studied the departure during preflight; to include the flyover waypoint at STCLR as well as the speed limit of MAX 230 knots at STCLR. As we crossed STCLR at 230 knots and approximately 3;000 feet; we were given a right turn to heading 120. I switched to heading mode and dialed in 120 for the heading. In the turn; the aircraft accelerated to approximately 240 knots. ATC advised us about 2/3 of the way through the turn that we were too fast for below the Class B airspace. This comment created confusion for us. We explained our compliance with the 230 knots restriction and I immediately slowed to 230 knots for the remainder of the departure. The flight continued to the destination as planned.During our 5 hour flight; we discussed and studied our situation.  Although SJC is not under the SFO Class B; the RNAV departure puts the flight path under the southern part of the SFO Class B. However; STCLR is within SJC Class C airspace below 4;000 feet. At STCLR; the bottom of the Class B is 7;000 feet. The departure is misleading; in that it says MAX 230 kts for STCLR. I focused too much on that speed restriction and not about the Class B. I'm not sure why the departure has that limit on it. I will fly my future departures out of SJC to the north at 200 knots.


Second narrative: We flew the TECKY 3 departure from 30L at SJC. We thought we complied with the departure by crossing the flyover waypoint STCLR at less than 230 knots. Making the right turn to the next waypoint we were assigned a 120 heading and began to accelerate since we were in the Class C and past the MAX 230 knot speed on the departure plate. ATC advised us we were too fast under the Class B. At the time we were very confused at ATC's statement; but slowed anyway. Nothing else said by ATC. Intensive study of several documents revealed our mistake and non compliance with 200 knots under the Class B. Although we discussed the chart for SJC; it mentioned nothing about the top of the SJC Class C being 4;000 the 5;000 foot altitude puts us under the Class B of 7;000; and the Class C is cut out so the turn radius after STCLR puts you outside the C and under the B. We both missed the note that highlights 200 kts below the Class B on the TECKY 3.Suggestions: Change the chart to reflect the Class B; C and 200 Knot below the B problem. Best option is a note placed on the SID making a 200 knot restriction on the departure until past the Class B; like a new point N37 22.4 W121 51.1 and SPEED might be an appropriate name.


Synopsis: Corporate aircraft flight crew reported exceeding 200 knots during departure below SJC Class B airspace.