ATCT local controller failed to ensure separation between a landing PA28, cleared to land, and a departing DC8, cleared for takeoff. The PA28 landed when the DC8 was positioning for takeoff.

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Attributes
ACN	414209
Time
Date	199809
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ont
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : ont
Operator	common carrier : air carrier
Make Model Name	DC-8 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : takeoff
Route In Use	departure other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	landing other other
Route In Use	arrival other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar pilot : instrument
Experience	controller radar : 10 flight time total : 250
ASRS Report	414209
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : ground critical non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 300 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft #2 was cleared to land on runway 26L while on downwind. Aircraft #1 was cleared for takeoff 1 min before reaching the runway. Aircraft #2 landed on the runway in front of aircraft #1. Aircraft #1 had not started departure roll.

Original NASA ASRS Text

Title: ATCT LCL CTLR FAILED TO ENSURE SEPARATION BTWN A LNDG PA28, CLRED TO LAND, AND A DEPARTING DC8, CLRED FOR TKOF. THE PA28 LANDED WHEN THE DC8 WAS POSITIONING FOR TKOF.

Narrative: ACFT #2 WAS CLRED TO LAND ON RWY 26L WHILE ON DOWNWIND. ACFT #1 WAS CLRED FOR TKOF 1 MIN BEFORE REACHING THE RWY. ACFT #2 LANDED ON THE RWY IN FRONT OF ACFT #1. ACFT #1 HAD NOT STARTED DEP ROLL.

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.