Date: 201509
Local time of day: 1801-2400
Location: SJC.Airport, CA
Flight conditions: VMC
Light: Dusk
Aircraft: B737-700
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Flight phase: Climb
Airspace: Class C SJC
ATC / advisory: Tower SJC
Second aircraft: Commercial Fixed Wing
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Flying
Human factors: Situational Awareness; Distraction
Second reporter function: First Officer; Pilot Not Flying
Anomaly: Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Wake Vortex Encounter
Detector: Person Flight Crew
When detected: In-flight
Result: Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented
Contributing factors: Human Factors; Procedure; Environment - Non Weather Related
Primary problem: Human Factors

Narrative: We took off with LNAV selected and our first waypoint being STCLR on the TECKY TWO Departure.  Before 1;000 feet; we experienced wake turbulence from the aircraft that departed in front of us.  At 1;000 feet I called for setting speed and flaps up.  I was hand flying and following the command bar guidance which started initiating a right turn.  My First Officer (FO) set the speed and told me he thought I was turning too early.  Looking at the display (although STCLR was in front of us) the magenta line looked like it was cutting us inside of it.  I said it looks like its leading the waypoint.  My FO pointed out it's a flyover waypoint.  We were already in a turn at that point; and then the FMC auto sequenced and it had us heading to VLREE which is three points down the line on the SID. ATC questioned our early turn.  Since we had lost our initial point of STCLR and already in the turn we asked for vectors and received a new clearance of a heading and altitude.  ATC then gave us a clearance of TECKY and to resume the departure.  We did - and flew to destination without further incident.I was too dependent on the automation and let the FMC take me into that turn early.  I needed to be more situationally aware of my position and was too distracted also by a little wake turbulence.


Second narrative: On the TECKY TWO departure out of SJC; Runway 30L. We were cleared for takeoff close behind a Company aircraft. LNAV was selected and the procedure had been properly briefed and verified before pushback. At 400 feet AGL LNAV was verified active by both pilots. At approximately 1;000 feet AGL we encountered moderate wake turbulence from the previous departure. The wake rolled the aircraft approximately 30-35 degrees into a right bank. The Pilot Flying (PF) was focused on maintaining roll attitude. I was heads down cleaning up the aircraft and switching to Departure frequency.I had switched to Departure; the Controller had already seen our earlier turn and was climbing the proceeding departure to avoid conflict. I told the PF that I was going to get a heading to fly. The Controller gave us a 120 heading and assigned us 5;000 feet. We continued on vectors while the Controller sorted out the mess we had made. We reloaded the TECKY waypoint and continued on the departure.


Synopsis: A B737-700 flight crew reported a track deviation on departure from SJC when the FMC commanded an early turn and then dumped some waypoints. The Captain mentioned he was distracted after encountering wake turbulence from the previous departure.