Small aircraft X landed on occupied runway over air carrier Y. System error. Near midair collision.

Attributes
ACN	215581
Time
Date	199207
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sdf
State Reference	KY
Altitude	agl bound lower : 0 agl bound upper : 50
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : sdf
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	descent : approach landing other
Flight Plan	VFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	climbout : takeoff ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller radar : 28 controller supervisory : 1
ASRS Report	215581
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private
Events
Anomaly	conflict : ground critical conflict : nmac non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 0 vertical : 50
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

When this incident happened, I was working local control in the tower. It was dark, VFR and very light traffic. We were on a crossing runway operation, landing runway 29 and departing runway 19. Approach called and coordinated an small aircraft X landing runway 19, and I approved the runway 19 operation. The small aircraft X called about 12 southwest and I cleared him to land runway 19. Some time later, air carrier Y called ready for departure of runway 19 and I cleared him for takeoff. I forgot about the small aircraft X. Small aircraft X came across the approach end of the runway as the air carrier was taking the runway for departure. This incident happened because I forgot about the small aircraft X. Contributing factors -- light traffic, night operation and the small aircraft X being a very small airplane not being very visible, fatigue, and the amount of time it took for the small aircraft X to get to the airport after I cleared him to land 12 mi out compared to any jet's calling and getting landing clrncs about 5 mi out.

Original NASA ASRS Text

Title: SMA X LANDED ON OCCUPIED RWY OVER ACR Y. SYS ERROR. NMAC.

Narrative: WHEN THIS INCIDENT HAPPENED, I WAS WORKING LCL CTL IN THE TWR. IT WAS DARK, VFR AND VERY LIGHT TFC. WE WERE ON A XING RWY OP, LNDG RWY 29 AND DEPARTING RWY 19. APCH CALLED AND COORDINATED AN SMA X LNDG RWY 19, AND I APPROVED THE RWY 19 OP. THE SMA X CALLED ABOUT 12 SW AND I CLRED HIM TO LAND RWY 19. SOME TIME LATER, ACR Y CALLED READY FOR DEP OF RWY 19 AND I CLRED HIM FOR TKOF. I FORGOT ABOUT THE SMA X. SMA X CAME ACROSS THE APCH END OF THE RWY AS THE ACR WAS TAKING THE RWY FOR DEP. THIS INCIDENT HAPPENED BECAUSE I FORGOT ABOUT THE SMA X. CONTRIBUTING FACTORS -- LIGHT TFC, NIGHT OP AND THE SMA X BEING A VERY SMALL AIRPLANE NOT BEING VERY VISIBLE, FATIGUE, AND THE AMOUNT OF TIME IT TOOK FOR THE SMA X TO GET TO THE ARPT AFTER I CLRED HIM TO LAND 12 MI OUT COMPARED TO ANY JET'S CALLING AND GETTING LNDG CLRNCS ABOUT 5 MI OUT.

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.