DC10 crew had track deviation on the quiet 2 departure in sfo class B airspace.

Attributes
ACN	484416
Time
Date	200009
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	msl single value : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	climbout : vacating altitude
Route In Use	arrival star : quiet 2
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 12000 flight time type : 2500
ASRS Report	484416
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 2000
ASRS Report	484420
Events
Anomaly	non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued alert flight crew : returned to original clearance none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We had been flying the same route all month (sfo-ind). We had been cleared to fly a published SID which required us to maintain runway heading until 4 DME, then turn left to an intercept heading for a radial off the sfo VOR. Every departure prior to this one ATC had instructed us to turn to a heading immediately after takeoff rather than fly the published SID. This clearance was always received as we were taking the runway. On this departure (first officer flying) we were not told to make an immediate turn as we had on previous departures, but during the initial climb out. We started our turn earlier than the 4 mi depicted on the SID. ATC told us to 'intercept the 342 degree radial,' which we were doing, but our initial reaction was to roll out of the departure turn, which, by coincidence, allowed us to get back on the published departure path. There was no traffic conflict or conflict of any kind, other than we turned to our intercept heading a little early. ATC told us 'no problem' but we felt a NASA report was appropriate. Supplemental information from acn 484420: quiet 2 departure, linden transition, sfo.

Original NASA ASRS Text

Title: DC10 CREW HAD TRACK DEV ON THE QUIET 2 DEP IN SFO CLASS B AIRSPACE.

Narrative: WE HAD BEEN FLYING THE SAME RTE ALL MONTH (SFO-IND). WE HAD BEEN CLRED TO FLY A PUBLISHED SID WHICH REQUIRED US TO MAINTAIN RWY HDG UNTIL 4 DME, THEN TURN L TO AN INTERCEPT HDG FOR A RADIAL OFF THE SFO VOR. EVERY DEP PRIOR TO THIS ONE ATC HAD INSTRUCTED US TO TURN TO A HDG IMMEDIATELY AFTER TKOF RATHER THAN FLY THE PUBLISHED SID. THIS CLRNC WAS ALWAYS RECEIVED AS WE WERE TAKING THE RWY. ON THIS DEP (FO FLYING) WE WERE NOT TOLD TO MAKE AN IMMEDIATE TURN AS WE HAD ON PREVIOUS DEPS, BUT DURING THE INITIAL CLBOUT. WE STARTED OUR TURN EARLIER THAN THE 4 MI DEPICTED ON THE SID. ATC TOLD US TO 'INTERCEPT THE 342 DEG RADIAL,' WHICH WE WERE DOING, BUT OUR INITIAL REACTION WAS TO ROLL OUT OF THE DEP TURN, WHICH, BY COINCIDENCE, ALLOWED US TO GET BACK ON THE PUBLISHED DEP PATH. THERE WAS NO TFC CONFLICT OR CONFLICT OF ANY KIND, OTHER THAN WE TURNED TO OUR INTERCEPT HDG A LITTLE EARLY. ATC TOLD US 'NO PROB' BUT WE FELT A NASA RPT WAS APPROPRIATE. SUPPLEMENTAL INFO FROM ACN 484420: QUIET 2 DEP, LINDEN TRANSITION, SFO.

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.