Small aircraft Y had less than standard separation from veh Y. System error.

Attributes
ACN	177772
Time
Date	199105
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lns
State Reference	PA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	climbout : takeoff
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller non radar : 4
ASRS Report	177772
Person 2
Affiliation	government : faa
Function	controller : ground
Qualification	controller : non radar
Events
Anomaly	conflict : ground less severe incursion : runway non adherence : required legal separation non adherence : published procedure non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 2000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Operational Error

Narrative:

Veh Y (FAA veh) cleared to cross runway 8 at departure end and proceed down parallel taxiway. Veh Y turned down runway 8 and drove down the runway. Small aircraft X was cleared for takeoff with veh on runway. Driver of veh turned off runway when he saw aircraft taking off. Veh was spotted by local controller clearing runway (veh pulled into the grass). The situation occurred because local controller's scan wasn't accurate. Also, ground control didn't watch INS ground traffic and ground didn't call clear of runway and control didn't question veh position. Also veh driver didn't understand his clearance and proceeded anyway. Controllers must watch airport closer, even when traffic is slow. Veh driver must listen to instructions and questions instructions if he doesn't understand. Callback conversation with reporter revealed the following: reporter experience 4 yrs non radar. Reporter was working the local control position. Reporter stated the ground controller had coordinated the veh runway crossing, but did not observe the veh clear the runway or receive a report clear of the runway. The reporter stated when he scanned the runway a post blocked his vision and that was why he did not see the veh on the runway. The pilot did not see the veh on the runway. No system error was filed.

Original NASA ASRS Text

Title: SMA Y HAD LESS THAN STANDARD SEPARATION FROM VEH Y. SYSTEM ERROR.

Narrative: VEH Y (FAA VEH) CLRED TO CROSS RWY 8 AT DEP END AND PROCEED DOWN PARALLEL TXWY. VEH Y TURNED DOWN RWY 8 AND DROVE DOWN THE RWY. SMA X WAS CLRED FOR TKOF WITH VEH ON RWY. DRIVER OF VEH TURNED OFF RWY WHEN HE SAW ACFT TAKING OFF. VEH WAS SPOTTED BY LCL CTLR CLRING RWY (VEH PULLED INTO THE GRASS). THE SITUATION OCCURRED BECAUSE LCL CTLR'S SCAN WASN'T ACCURATE. ALSO, GND CTL DIDN'T WATCH INS GND TFC AND GND DIDN'T CALL CLR OF RWY AND CTL DIDN'T QUESTION VEH POS. ALSO VEH DRIVER DIDN'T UNDERSTAND HIS CLRNC AND PROCEEDED ANYWAY. CTLRS MUST WATCH ARPT CLOSER, EVEN WHEN TFC IS SLOW. VEH DRIVER MUST LISTEN TO INSTRUCTIONS AND QUESTIONS INSTRUCTIONS IF HE DOESN'T UNDERSTAND. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR EXPERIENCE 4 YRS NON RADAR. RPTR WAS WORKING THE LCL CTL POS. RPTR STATED THE GND CTLR HAD COORDINATED THE VEH RWY XING, BUT DID NOT OBSERVE THE VEH CLR THE RWY OR RECEIVE A RPT CLR OF THE RWY. THE RPTR STATED WHEN HE SCANNED THE RWY A POST BLOCKED HIS VISION AND THAT WAS WHY HE DID NOT SEE THE VEH ON THE RWY. THE PLT DID NOT SEE THE VEH ON THE RWY. NO SYS ERROR WAS FILED.

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.