B777 flight crew reported that the OCEAN2A departure out of vhhh required a maximum speed of 220 kno...

Narrative:

Ocean 2A departure from runway 7R at hong kong calls for a max speed of 220 knots to td VOR. At our T.O. Weight of 752;000 lbs this requires leaving the flaps at 5 degrees. Once we were given authorization to fly faster we began our clean-up. Flaps from 5 to 1 was normal. At flaps up speed we selected flaps zero. This was between 9000'-10;000'; 29 degrees C which equates to a density altitude of 13;000'-14;000'. We were accelerating at the time of retraction. As soon as the wing became clean the yellow foot came up on the airspeed indicator and we were well below the 'foot'. At flaps up speed prior to retraction we had about a 10-15 knot spread between the 'foot' and the red 'zipper'. However on this procedure with the requirement to hold 220 kts; high density altitude and high gross weight it appears it put the aircraft in a position of being unable to stay above the yellow foot. I know this departure is flown by crews at even higher gross weights and am sure it must be able to be flown within the proper flight envelope but on this day under these conditions it seemed to be beyond the aircraft's operating limit. I would welcome feedback on this if possible.

Original NASA ASRS Text

Title: B777 flight crew reported that the OCEAN2A departure out of VHHH required a maximum speed of 220 knots to TD. Flaps zero were selected at 9000 feet; with a temperature of 29C and resulted in a speed well below clean maneuver speed as the wing became clean.

Narrative: Ocean 2A departure from Runway 7R at Hong Kong calls for a max speed of 220 knots to TD VOR. At our T.O. weight of 752;000 lbs this requires leaving the flaps at 5 degrees. Once we were given authorization to fly faster we began our clean-up. Flaps from 5 to 1 was normal. At flaps up speed we selected flaps zero. This was between 9000'-10;000'; 29 degrees C which equates to a density altitude of 13;000'-14;000'. We were accelerating at the time of retraction. As soon as the wing became clean the yellow foot came up on the airspeed indicator and we were well below the 'foot'. At flaps up speed prior to retraction we had about a 10-15 knot spread between the 'foot' and the red 'zipper'. However on this procedure with the requirement to hold 220 kts; high density altitude and high gross weight it appears it put the aircraft in a position of being unable to stay above the yellow foot. I know this departure is flown by crews at even higher gross weights and am sure it must be able to be flown within the proper flight envelope but on this day under these conditions it seemed to be beyond the aircraft's operating limit. I would welcome feedback on this if possible.

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.

Attributes
ACN	1387470
Time
Date	201609
Local Time Of Day	1801-2400
Place
Locale Reference	VHHK.ARTCC
State Reference	FO
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID OCEAN2A
Flight Plan	IFR
Person 1
Function	Captain
Person 2
Function	First Officer
Events
Anomaly	Deviation - Procedural Published Material / Policy Inflight Event / Encounter Weather / Turbulence

B777 flight crew reported that the OCEAN2A departure out of vhhh required a maximum speed of 220 knots to td. Flaps zero were selected at 9000 feet; with a temperature of 29C and resulted in a speed well below clean maneuver speed as the wing became clean.