Loss of separation for air carrier on the quiet bridge approach at sfo.

Attributes
ACN	115657
Time
Date	198906
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 7300 msl bound upper : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air taxi
Make Model Name	Light Transport, High Wing, 2 Turboprop Eng
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 1200
ASRS Report	115657
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance none taken : detected after the fact other
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 300
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Approaching sfo on quiet bridge visual, received clearance to intercept 095 degree radial and descend to 7000'. Checked in on second approach control frequency out of 7300 for 7000. We were told to climb immediately to 8000, traffic 12 O'clock at 7000. We had visual contact with the light transport Y the entire time. Telephoned facility supervisor and he said controller mistakenly thought a clearance to 9000' had been issued.

Original NASA ASRS Text

Title: LOSS OF SEPARATION FOR AIR CARRIER ON THE QUIET BRIDGE APCH AT SFO.

Narrative: APCHING SFO ON QUIET BRIDGE VISUAL, RECEIVED CLRNC TO INTERCEPT 095 DEG RADIAL AND DSND TO 7000'. CHECKED IN ON SECOND APCH CTL FREQ OUT OF 7300 FOR 7000. WE WERE TOLD TO CLIMB IMMEDIATELY TO 8000, TFC 12 O'CLOCK AT 7000. WE HAD VISUAL CONTACT WITH THE LTT Y THE ENTIRE TIME. TELEPHONED FAC SUPVR AND HE SAID CTLR MISTAKENLY THOUGHT A CLRNC TO 9000' HAD BEEN ISSUED.

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.