Sfo ATCT radar coordinator reports success with amass equipment. Near runway incursion.

Attributes
ACN	546640
Time
Date	200205
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Boeing Business Jet
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff
Route In Use	departure sid : n/s
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : sfo.tower
Operator	common carrier : air taxi
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 135
Flight Phase	landing : roll
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller limited radar : 10 controller radar : 2.5 controller time certified in position1 : 2.5 flight time total : 190
ASRS Report	546640
Person 2
Affiliation	government : faa
Function	controller : radar other personnel other
Events
Anomaly	non adherence : published procedure
Independent Detector	atc equipment other atc equipment : amass other controllera other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 4000 vertical : 0
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance

Narrative:

I was receiving information during position relief briefing. Local was busy issuing traffic alert to an aircraft on the edge of airspace. Local cleared boeing for takeoff while arrival had not exited runway. Cabin coordinator alerted local just before amass alerted. Local canceled takeoff clearance (today the system worked very well). A contributing factor may have been that the boeing could not see the learjet because of the slope of the runway. Another contributing factor may have been the learjet not hearing an aircraft cleared for takeoff on the runway that they still occupied and not questioned the local controller.

Original NASA ASRS Text

Title: SFO ATCT RADAR COORDINATOR RPTS SUCCESS WITH AMASS EQUIP. NEAR RWY INCURSION.

Narrative: I WAS RECEIVING INFO DURING POS RELIEF BRIEFING. LCL WAS BUSY ISSUING TFC ALERT TO AN ACFT ON THE EDGE OF AIRSPACE. LCL CLRED BOEING FOR TKOF WHILE ARR HAD NOT EXITED RWY. CABIN COORDINATOR ALERTED LCL JUST BEFORE AMASS ALERTED. LCL CANCELED TKOF CLRNC (TODAY THE SYS WORKED VERY WELL). A CONTRIBUTING FACTOR MAY HAVE BEEN THAT THE BOEING COULD NOT SEE THE LEARJET BECAUSE OF THE SLOPE OF THE RWY. ANOTHER CONTRIBUTING FACTOR MAY HAVE BEEN THE LEARJET NOT HEARING AN ACFT CLRED FOR TKOF ON THE RWY THAT THEY STILL OCCUPIED AND NOT QUESTIONED THE LCL CTLR.

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.