B747-200 receives GPWS alert while complying with the published attol 1A departure from vhhh.

Attributes
ACN	605014
Time
Date	200401
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : vhhh.airport
State Reference	FO
Altitude	msl single value : 1800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : attol 1a
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 15500 flight time type : 3000
ASRS Report	605014
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 11000 flight time type : 610
ASRS Report	605013
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation other spatial deviation
Independent Detector	aircraft equipment : gpws other controllera other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Airspace Structure Chart Or Publication Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

In hkg we received the attol 1A clearance. We departed runway 7R tracking 073 degrees to porpa. Once reaching porpa (7 DME isr) we began the right turn to bream. (The INS also verified that we were at porpa.) en route to bream (in VFR day conditions) the GPWS sounded and I, as the PF, added power, stopped the turn and started additional climb to comply with the GPWS. After passing all terrain, ATC then turned us to 090 degree heading. Later I had the first officer ask ATC. They informed us that we started the turn early. Callback conversation with reporter revealed the following information: reporter stated that the aircraft was a B747-200 with no autoflt system, FMC, or GPS. Reporter said that he was hand-flying the departure. Reporter advised that the aircraft's actual position on the cargo ramp was used to align the INS prior to departure and that there was no significant disparity between the DME and INS on any subsequent fixes. Reporter stated that he did not turn early, but rather waited until crossing the porpa fix, as indicated by the DME, INS, and lkc VOR radial. Reporter stated that while attending recurrent training, he heard about two other flight crews having the same experience. Reporter advised that he could have been inside the turn radius prescribed if the published procedure is based on a standard rate turn.

Original NASA ASRS Text

Title: B747-200 RECEIVES GPWS ALERT WHILE COMPLYING WITH THE PUBLISHED ATTOL 1A DEP FROM VHHH.

Narrative: IN HKG WE RECEIVED THE ATTOL 1A CLRNC. WE DEPARTED RWY 7R TRACKING 073 DEGS TO PORPA. ONCE REACHING PORPA (7 DME ISR) WE BEGAN THE R TURN TO BREAM. (THE INS ALSO VERIFIED THAT WE WERE AT PORPA.) ENRTE TO BREAM (IN VFR DAY CONDITIONS) THE GPWS SOUNDED AND I, AS THE PF, ADDED PWR, STOPPED THE TURN AND STARTED ADDITIONAL CLB TO COMPLY WITH THE GPWS. AFTER PASSING ALL TERRAIN, ATC THEN TURNED US TO 090 DEG HDG. LATER I HAD THE FO ASK ATC. THEY INFORMED US THAT WE STARTED THE TURN EARLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE ACFT WAS A B747-200 WITH NO AUTOFLT SYS, FMC, OR GPS. RPTR SAID THAT HE WAS HAND-FLYING THE DEP. RPTR ADVISED THAT THE ACFT'S ACTUAL POS ON THE CARGO RAMP WAS USED TO ALIGN THE INS PRIOR TO DEP AND THAT THERE WAS NO SIGNIFICANT DISPARITY BTWN THE DME AND INS ON ANY SUBSEQUENT FIXES. RPTR STATED THAT HE DID NOT TURN EARLY, BUT RATHER WAITED UNTIL XING THE PORPA FIX, AS INDICATED BY THE DME, INS, AND LKC VOR RADIAL. RPTR STATED THAT WHILE ATTENDING RECURRENT TRAINING, HE HEARD ABOUT TWO OTHER FLT CREWS HAVING THE SAME EXPERIENCE. RPTR ADVISED THAT HE COULD HAVE BEEN INSIDE THE TURN RADIUS PRESCRIBED IF THE PUBLISHED PROC IS BASED ON A STANDARD RATE TURN.

Data retrieved from NASA's ASRS site as of July 2007 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.