Narrative:

Departing narita at night from runway 34R after a heavy jet using the tetra 5 SID. The FMC was programmed properly for the departure but after takeoff/climb established with the aircraft in the clean configuration a discontinuity was observed on the legs page. I was the flying pilot so I switched from VNAV to flch and used a 230 knot climb speed as per the departure advisory while we closed the discontinuity. Either wake turbulence or wind shearing during the climb out was experienced at about the time a radio frequency change and an on course heading change were in progress. The departure has a 7000 foot crossing restriction and then a climb after; it also has a ninety degree turn 4 miles after the first fix about 4 miles from the airport (approximately 8 miles from the runway). The clearance that we received on the ground was to climb to FL210; shortly before the crossing restriction fix ATC called to say maintain 7000 ft. And switch frequencies; I had not put the autopilot back in VNAV climb which had the restriction programmed in it and we continued through 7000 feet before I manually descended back. The next controller verified our altitude at 7 and immediately gave us a climb clearance to FL210 all during turbulence and within 15 seconds of each other. The autopilot was left in LNAV for lateral navigation and was not interrupted during the closing of the discontinuity and no deviations to course were observed. That's not to say that an excursion from course could have occurred but gone unnoticed during a critical phase of flight. ATC made no comment and we continued to destination. If I had reestablished the autopilot in VNAV the aircraft would have caught the restriction; as it was I missed it and the excursion from altitude occurred.

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Original NASA ASRS Text

Title: Air carrier flight crew reported climbing through a crossing restriction departing RJAA with distractions from windshear or a wake vortex encounter playing a part.

Narrative: Departing Narita at night from Runway 34R after a heavy jet using the TETRA 5 SID. The FMC was programmed properly for the departure but after takeoff/climb established with the aircraft in the clean configuration a discontinuity was observed on the legs page. I was the flying pilot so I switched from VNAV to FLCH and used a 230 knot climb speed as per the departure advisory while we closed the discontinuity. Either wake turbulence or wind shearing during the climb out was experienced at about the time a radio frequency change and an on course heading change were in progress. The departure has a 7000 foot crossing restriction and then a climb after; it also has a ninety degree turn 4 miles after the first fix about 4 miles from the airport (approximately 8 miles from the runway). The clearance that we received on the ground was to climb to FL210; shortly before the crossing restriction fix ATC called to say maintain 7000 ft. and switch frequencies; I had not put the autopilot back in VNAV climb which had the restriction programmed in it and we continued through 7000 feet before I manually descended back. The next controller verified our altitude at 7 and immediately gave us a climb clearance to FL210 all during turbulence and within 15 seconds of each other. The autopilot was left in LNAV for lateral navigation and was not interrupted during the closing of the discontinuity and no deviations to course were observed. That's not to say that an excursion from course could have occurred but gone unnoticed during a critical phase of flight. ATC made no comment and we continued to destination. If I had reestablished the autopilot in VNAV the aircraft would have caught the restriction; as it was I missed it and the excursion from altitude occurred.

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.