Narrative:

On aug/thu/01, at isp ATCT, there were 3 controllers on duty (one a pq) because of 2 controllers taking sick leave. At the time in question, I was working the #4 position noted and runways 15R and 15L were active. The one other controller in the cabin attendant was working flight data, clearance delivery and was controller-in-charge. I was responsible for all moving aircraft and vehicles on the airport. There was a major construction operation on the airport and a lot of vehicle activity. I had 9 aircraft on frequency, 4 in the air and 5 on the ground. The DH8 was on a right downwind for runway 15R and I was giving him the calls for a cessna doing a photo-shoot to the northwest and a RH22 helicopter inbound from the north. Although the DH8 was cleared for runway 15R, he became confused and lined up for runway 10. A BE90 had just crossed runway 10 at the numbers. A cessna was about 800 ft from entering runway 10 to cross at the numbers of runway 10, and a B737 was 500 or 600 ft from crossing runway 10 at the middle. Because of the potential conflict with a PA28 in the touch and go pattern for runway 15L and my assessment that there was no chance of a collision with taxiing aircraft, I cleared the DH8 to land on runway 10. If I had an ATC working ground control, this almost surely wouldn't have happened.

Related reports:

Google
 

Original NASA ASRS Text

Title: ISP LCL CTLR INVOLVED IN OPERROR GND INCIDENT WITH COMBINED CTL POS WITH OTHER CONFLICTING AIRBORNE TFC CAUSING A DISTR.

Narrative: ON AUG/THU/01, AT ISP ATCT, THERE WERE 3 CTLRS ON DUTY (ONE A PQ) BECAUSE OF 2 CTLRS TAKING SICK LEAVE. AT THE TIME IN QUESTION, I WAS WORKING THE #4 POS NOTED AND RWYS 15R AND 15L WERE ACTIVE. THE ONE OTHER CTLR IN THE CAB WAS WORKING FLT DATA, CLRNC DELIVERY AND WAS CTLR-IN-CHARGE. I WAS RESPONSIBLE FOR ALL MOVING ACFT AND VEHICLES ON THE ARPT. THERE WAS A MAJOR CONSTRUCTION OP ON THE ARPT AND A LOT OF VEHICLE ACTIVITY. I HAD 9 ACFT ON FREQ, 4 IN THE AIR AND 5 ON THE GND. THE DH8 WAS ON A R DOWNWIND FOR RWY 15R AND I WAS GIVING HIM THE CALLS FOR A CESSNA DOING A PHOTO-SHOOT TO THE NW AND A RH22 HELI INBOUND FROM THE N. ALTHOUGH THE DH8 WAS CLRED FOR RWY 15R, HE BECAME CONFUSED AND LINED UP FOR RWY 10. A BE90 HAD JUST CROSSED RWY 10 AT THE NUMBERS. A CESSNA WAS ABOUT 800 FT FROM ENTERING RWY 10 TO CROSS AT THE NUMBERS OF RWY 10, AND A B737 WAS 500 OR 600 FT FROM XING RWY 10 AT THE MIDDLE. BECAUSE OF THE POTENTIAL CONFLICT WITH A PA28 IN THE TOUCH AND GO PATTERN FOR RWY 15L AND MY ASSESSMENT THAT THERE WAS NO CHANCE OF A COLLISION WITH TAXIING ACFT, I CLRED THE DH8 TO LAND ON RWY 10. IF I HAD AN ATC WORKING GND CTL, THIS ALMOST SURELY WOULDN'T HAVE HAPPENED.

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.