B737-200 crew and an air carrier B737 had questionable separation in nct class B.

Attributes
ACN	578687
Time
Date	200304
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : oak.airport
State Reference	CA
Altitude	msl single value : 3200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : nct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude climbout : initial
Route In Use	departure sid : skyline
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : nct.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 26000 flight time type : 11000
ASRS Report	578687
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 7450 flight time type : 1900
ASRS Report	578685
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : company policies non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued alert controller : separated traffic flight crew : took evasive action
Miss Distance	horizontal : 9000
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departing oak on the skline departure, tower handed us off to nct departure. Controller I thought, said turn left to heading of 170 degrees and climb to 10000 ft. I read that back. At about 200 degrees in a left turn, controller transmits turn back right to 270 degrees immediately. We turned quickly back to 270 degrees. Then controller transmits, 'air carrier X, level off at 3000 ft or 3300 ft,' which we were climbing through. I read back, 'level off at 3000 ft, air carrier X.' we were at 3000 ft on heading 270 degrees with air carrier Y off the left in sight. No TCASII alert went off. Controller then said, 'air carrier X, climb to and maintain 10000 ft.' I read that back and started to climb.' supplemental information from acn 578685: the in-flight separation was never less than 1 1/2 mi. TCASII never activated during the entire event.

Original NASA ASRS Text

Title: B737-200 CREW AND AN ACR B737 HAD QUESTIONABLE SEPARATION IN NCT CLASS B.

Narrative: DEPARTING OAK ON THE SKLINE DEP, TWR HANDED US OFF TO NCT DEP. CTLR I THOUGHT, SAID TURN L TO HEADING OF 170 DEGS AND CLB TO 10000 FT. I READ THAT BACK. AT ABOUT 200 DEGS IN A L TURN, CTLR XMITS TURN BACK R TO 270 DEGS IMMEDIATELY. WE TURNED QUICKLY BACK TO 270 DEGS. THEN CTLR XMITS, 'ACR X, LEVEL OFF AT 3000 FT OR 3300 FT,' WHICH WE WERE CLBING THROUGH. I READ BACK, 'LEVEL OFF AT 3000 FT, ACR X.' WE WERE AT 3000 FT ON HEADING 270 DEGS WITH ACR Y OFF THE L IN SIGHT. NO TCASII ALERT WENT OFF. CTLR THEN SAID, 'ACR X, CLB TO AND MAINTAIN 10000 FT.' I READ THAT BACK AND STARTED TO CLB.' SUPPLEMENTAL INFO FROM ACN 578685: THE INFLT SEPARATION WAS NEVER LESS THAN 1 1/2 MI. TCASII NEVER ACTIVATED DURING THE ENTIRE EVENT.

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.