Flight crew of medium large transport on porte departure out of sfo failed to observe the 4 mile arc...

Attributes
ACN	108485
Time
Date	198904
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sfo
State Reference	CA
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : initial
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 20000 flight time type : 3000
ASRS Report	108485
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 11000 flight time type : 3500
ASRS Report	108489
Events
Anomaly	conflict : airborne less severe other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We had just taken off runway 1L at sfo. The tower switched us to departure control on 135.1. We noted a company aircraft Y crossing at 12 O'clock high moving toward 10 O'clock. We confirmed with the controller that we had company out of 3000' (we were out of 2000'). His transmission was then covered. After a third attempt we copied 'level at 4000'.' we verified that we were to level at 4000' and we watched company pass comfortably off to the left at about the same altitude. The controller gave us a heading to intercept the pye 135 degree right and we read back. He was cut out, then he asked if we had started our turn at 4 DME (porte departure) off of sfo. We then realized that while we had been watching company's maneuvers with some concern, we had overshot the left turn point. Definitely an error on our part. We wouldn't have started the turn in any case due to the proximity ot our company aircraft. However, we should have requested the deviation.

Original NASA ASRS Text

Title: FLT CREW OF MLG ON PORTE DEP OUT OF SFO FAILED TO OBSERVE THE 4 MILE ARC.

Narrative: WE HAD JUST TAKEN OFF RWY 1L AT SFO. THE TWR SWITCHED US TO DEP CTL ON 135.1. WE NOTED A COMPANY ACFT Y XING AT 12 O'CLOCK HIGH MOVING TOWARD 10 O'CLOCK. WE CONFIRMED WITH THE CTLR THAT WE HAD COMPANY OUT OF 3000' (WE WERE OUT OF 2000'). HIS XMISSION WAS THEN COVERED. AFTER A THIRD ATTEMPT WE COPIED 'LEVEL AT 4000'.' WE VERIFIED THAT WE WERE TO LEVEL AT 4000' AND WE WATCHED COMPANY PASS COMFORTABLY OFF TO THE LEFT AT ABOUT THE SAME ALT. THE CTLR GAVE US A HDG TO INTERCEPT THE PYE 135 DEG R AND WE READ BACK. HE WAS CUT OUT, THEN HE ASKED IF WE HAD STARTED OUR TURN AT 4 DME (PORTE DEP) OFF OF SFO. WE THEN REALIZED THAT WHILE WE HAD BEEN WATCHING COMPANY'S MANEUVERS WITH SOME CONCERN, WE HAD OVERSHOT THE LEFT TURN POINT. DEFINITELY AN ERROR ON OUR PART. WE WOULDN'T HAVE STARTED THE TURN IN ANY CASE DUE TO THE PROX OT OUR COMPANY ACFT. HOWEVER, WE SHOULD HAVE REQUESTED THE DEVIATION.

Data retrieved from NASA's ASRS site as of August 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.