Teb controller described a potential ground conflict when traffic exiting the runway initiated a 'U'...

Attributes
ACN	992020
Time
Date	201202
Local Time Of Day	1801-2400
Place
Locale Reference	TEB.Airport
State Reference	NJ
Aircraft 1
Make Model Name	Citation Excel (C560XL)
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Flight Plan	VFR
Aircraft 2
Make Model Name	Gulfstream Jet Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Landing
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	Conflict Ground Conflict Critical Deviation - Procedural Clearance

Narrative:

A C560 landed on runway 01 and exited on taxiway Q. A gulfstream landed on runway 01 after the C560 cleared the runway at taxiway Q. Upon passing the hold short line; the C560 switched to ground control frequency and made a 'U' turn on taxiway Q; back towards runway 01. Upon seeing this; I immediately told the gulfstream; who had touched down onto runway 01 at this point; to stop. The gulfstream came to a full stop between taxiways D and F. Both aircraft exited runway 01 and taxied to parking without incident. It should be stressed to pilots during their training and careers the importance of working together with ATC. Perhaps he was confused about the airport layout; but there is nothing wrong with asking for progressive taxi instructions instead of making poor decisions with dire consequences.

Original NASA ASRS Text

Title: TEB Controller described a potential ground conflict when traffic exiting the runway initiated a 'U' turn toward the landing runway; the reporter directed a subsequent landing aircraft to stop on roll out.

Narrative: A C560 landed on Runway 01 and exited on Taxiway Q. A Gulfstream landed on Runway 01 after the C560 cleared the runway at Taxiway Q. Upon passing the hold short line; the C560 switched to Ground Control frequency and made a 'U' turn on Taxiway Q; back towards Runway 01. Upon seeing this; I immediately told the Gulfstream; who had touched down onto Runway 01 at this point; to stop. The Gulfstream came to a full stop between Taxiways D and F. Both aircraft exited Runway 01 and taxied to parking without incident. It should be stressed to pilots during their training and careers the importance of working together with ATC. Perhaps he was confused about the airport layout; but there is nothing wrong with asking for progressive taxi instructions instead of making poor decisions with dire consequences.

Data retrieved from NASA's ASRS site as of July 2013 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.

Teb controller described a potential ground conflict when traffic exiting the runway initiated a 'U' turn toward the landing runway; the reporter directed a subsequent landing aircraft to stop on roll out.