B737-800
Distraction
Deviation - Altitude Overshoot; Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Returned To Clearance
Procedure; Environment - Non Weather Related; Human Factors
Descending into LAX via the SEAVU2 arrival and cleared for the visual to [Runway] 25L around PAUMA ATC asked us to cross KONZL at 16;000 FT. In a VNAV speed and following a 777 we were experiencing quite a bit of wake turbulence. Made the restriction at KONZL for traffic but were briefly below the path at ENGLI. Back in VNAV path the rest of the descent and landing. No comment from ATC. Just got busy and a little distracted with the wake turbulence and looking for crossing traffic.
Turbulence from Heavy 777 ahead [was] now bouncing us around and pilot flying [was] struggling to get aircraft back on profile; altitude; and slightly above wake turbulence. Aircraft was below path significantly and went below crossing restrictions at ENGLI and PECOX. Pilot not flying made verbal alerts that we were below the published descent path. Pilot flying got aircraft back onto proper path (slightly above to avoid wake turbulence) and continued to a normal visual approach to [Runway] 25L. ATC made no mention of deviation. I did mention to ATC during visual approach that we were being affected by preceding aircraft significant wake turbulence. Better spacing is needed for VNAV descents to high density airports such as lax and VFR aircraft must be kept well away from approach corridors. We could have told ATC we were unable to comply due to late changes and in speed and altitude and wake turbulence made the situation worse. Flying pilot did get 'behind' aircraft and was slow to correct. Eventually caught up to aircraft and proceeded normally.
B737-800 flight crew reported difficulty adhering to charted altitudes on arrival into LAX when wake turbulence from preceding B777 distracted them.