B747 Undifferentiated or Other Model
Flight Crew Last 90 Days 100; Flight Crew Total 20000
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued Advisory / Alert
Environment - Non Weather Related
ATC asked us why we were left of course in the initial climbing turn after departing on 34L. The pilot flying flew the departure as published; however I did notice he was slightly left of course. It did not seem significant and we were in continuous wake turbulence from the preceding aircraft. Also; we were heavy and I believe he was limiting the bank angle somewhat due to weight and turbulence. I saw nothing alarming or concerning. I have been flying in and out of RJAA for 23 years and contribute this to an over zealous controller!
Departed RJAA following the CUPID ONE Departure procedure. Climbed direct to ARIES; accelerated and retracted the flaps. Approaching AD4L1; initiated a turn utilizing the flight director. Following the flight director bank bar; we continued the turn to AD4L2 and AD4L3 and leveled off at 7000 feet. About halfway through the turn the Air Traffic Controller said that we were left of course and directed us to turn to a heading of about 170. He then asked why we were left of course. Our reply was that we were turning using a standard rate and our high gross weight and airspeed caused a wide turn.
B747 flight crew reported ATC questioned their track departing RJAA when they deviated slightly while in continuous wake turbulence.