B737 Next Generation Undifferentiated
Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 4800
Situational Awareness
ATC Issue All Types; Deviation - Altitude Crossing Restriction Not Met; Deviation - Altitude Undershoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued Advisory / Alert; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure; Human Factors
We did not make the 7000 ft crossing restriction due to wake turbulence from preceding aircraft. We were on the VNAV PATH getting close to MYNEE but had to slow the descent because we got into preceding aircraft's wake turbulence for the third or fourth time on the STAR. The Captain and I discussed getting out of the preceding aircraft's wake by asking NorCal for the visual approach to 30 at OAK. This would alleviate the wake turbulence issue. By the time we asked for the visual 30 and got cleared the visual; we did not make the MYNEE 7000 ft restriction which we didn't think was a big deal because we had just gotten cleared the visual. Somewhere around MYSHN approximately five miles past MYNEE; NorCal advised us we didn't make the altitude restriction at MYNEE. We just agreed and moved on even though both of us were confused.
We were distracted by the wake turbulence and neglected to inform ATC that we were high. In retrospect; advising them earlier would have been a better idea.
B737 flight crew reported they failed to make a crossing restriction on arrival into OAK after multiple wake turbulence encounters.