B777 Undifferentiated or Other Model
Workload; Time Pressure; Human-Machine Interface; Distraction
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Weather / Turbulence
Air Traffic Control Issued New Clearance
Airport; Chart Or Publication; Human Factors; Procedure; Weather
On climb out from VIDP we were assigned 2600 feet; but overshot that by approximately 300 feet and were correcting back when a higher altitude was given. We were on NADP-1 profile with accel ht of 3000 feet which created a high workload immediately after takeoff. We also had our runway changed 3 times (4 iterations of loading the dept) with different clearances for each runway (initially cleared to 6000 feet on RWY28; then finally cleared 2600 feet on RWY29). We were running RWY change checklists; considering anti-ice requirements; and considering if the First Officer could takeoff in the reduced vis. We did not adequately consider the NADP-1 accel ht being higher than cleared altitude since it was initially not a problem with a 6000 feet level off.
It was a very foggy evening in Delhi. Runways 29 and 28 were alternately closing due to visibility issues. Between pushback and our final takeoff we received 5 runway assignments. The runway and departure changes were incomplete each time and I had to query the controller regarding which SID and transition and altitude.
Following multiple runway changes due to varying visibility the flight crew of a B777 eventually took off from Runway 29 at VIDP but; with an initial level off at only about 1;800 AGL; the pilot flying overshot by about 300 FT. A nearly coincidental clearance to higher precluded the need for an abrupt return to their cleared altitude.