B737 first officer reported missing a crossing restriction on climbout from lax citing VNAV performa...

Attributes
ACN	1491284
Time
Date	201710
Local Time Of Day	0601-1200
Place
Locale Reference	LAX.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID ORCKA2
Flight Plan	IFR
Aircraft 2
Make Model Name	B777 Undifferentiated or Other Model
Flight Phase	Climb
Route In Use	SID ORCKA2
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 2551
Events
Anomaly	Deviation - Altitude Undershoot Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Approaching keggs on the ORCKA2 RNAV departure; while in VNAV; ATC notified us that we were not meeting the climb restriction. Aircraft was in VNAV with econ climb selected and accelerating prior to disengaging the auto pilot. It should have been climbing at a slower speed rather than the econ climb speed of 320 KIAS to achieve the required climb angle. The speed of 320 was priority over the altitude. I believe a tailwind also compounded the problem. We were about 12000 MSL when ATC notified us that we would miss the 13000 restriction. It is unknown to me exactly how far off we would be at keggs; but I knew we wouldn't make it and realized my mistake. Even still I disconnected the autopilot and began to trade excess airspeed for altitude to attempt to make the restriction but then immediately encountered wake turbulence from the B777 ahead of us. We missed the altitude restriction mostly because of VNAV leveling us off to accelerate. But to make matters worse; when I disconnected the autopilot and got into the wake of the preceding aircraft I couldn't be as aggressive to correct as would have been needed. Once out of the wake; I put the aircraft into a 280 KIAS climb and got back onto the profile; easily making the next restriction of 15000 or above at coopp. ATC never said anything else to us about the event. I should have noticed sooner; corrected the flight path and asked ATC for relief from the restriction.

Original NASA ASRS Text

Title: B737 First Officer reported missing a crossing restriction on climbout from LAX citing VNAV performance and a wake turbulence encounter as contributing.

Narrative: Approaching KEGGS on the ORCKA2 RNAV Departure; while in VNAV; ATC notified us that we were not meeting the climb restriction. Aircraft was in VNAV with ECON climb selected and accelerating prior to disengaging the auto pilot. It should have been climbing at a slower speed rather than the ECON climb speed of 320 KIAS to achieve the required climb angle. The speed of 320 was priority over the altitude. I believe a tailwind also compounded the problem. We were about 12000 MSL when ATC notified us that we would miss the 13000 restriction. It is unknown to me exactly how far off we would be at KEGGS; but I knew we wouldn't make it and realized my mistake. Even still I disconnected the autopilot and began to trade excess airspeed for altitude to attempt to make the restriction but then immediately encountered wake turbulence from the B777 ahead of us. We missed the altitude restriction mostly because of VNAV leveling us off to accelerate. But to make matters worse; when I disconnected the autopilot and got into the wake of the preceding aircraft I couldn't be as aggressive to correct as would have been needed. Once out of the wake; I put the aircraft into a 280 KIAS climb and got back onto the profile; easily making the next restriction of 15000 or above at COOPP. ATC never said anything else to us about the event. I should have noticed sooner; corrected the flight path and asked ATC for relief from the restriction.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

B737 first officer reported missing a crossing restriction on climbout from lax citing VNAV performance and a wake turbulence encounter as contributing.