System error occurs as clearance takeoff issued for takeoff on occupied runway.

Attributes
ACN	279936
Time
Date	199408
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mia
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : isp
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : instrument pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 230 flight time total : 2000
ASRS Report	279936
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : ground critical inflight encounter : weather non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff
Consequence	Other
Miss Distance	horizontal : 1000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Our flight was from miami international. To kingston jamaica. The WX was rainy with heavy showers in the area. Visibility was 5000 ft run and lower at times. We were cleared onto runway 09L for takeoff. We advanced power for takeoff, checked all engine and flight instruments and began our takeoff roll. The aircraft had just started to roll, when we saw a 727 on our runway. The 727 was crossing the runway from left to right approximately 1000 ft down the runway (taxiway L1). We aborted the takeoff roll with very little forward speed and stopped the aircraft. The captain then informed tower of the conflict and asked, what was the 727 doing there? Tower responded by saying the 727 had a 'conditional clearance' to cross and should have been clear. Tower then apologized and then cleared us to continue our takeoff, which we did.

Original NASA ASRS Text

Title: SYS ERROR OCCURS AS CLRNC TKOF ISSUED FOR TKOF ON OCCUPIED RWY.

Narrative: OUR FLT WAS FROM MIAMI INTL. TO KINGSTON JAMAICA. THE WX WAS RAINY WITH HVY SHOWERS IN THE AREA. VISIBILITY WAS 5000 FT RUN AND LOWER AT TIMES. WE WERE CLRED ONTO RWY 09L FOR TKOF. WE ADVANCED PWR FOR TKOF, CHKED ALL ENG AND FLT INSTS AND BEGAN OUR TKOF ROLL. THE ACFT HAD JUST STARTED TO ROLL, WHEN WE SAW A 727 ON OUR RWY. THE 727 WAS XING THE RWY FROM L TO R APPROX 1000 FT DOWN THE RWY (TXWY L1). WE ABORTED THE TKOF ROLL WITH VERY LITTLE FORWARD SPD AND STOPPED THE ACFT. THE CAPT THEN INFORMED TWR OF THE CONFLICT AND ASKED, WHAT WAS THE 727 DOING THERE? TWR RESPONDED BY SAYING THE 727 HAD A 'CONDITIONAL CLRNC' TO CROSS AND SHOULD HAVE BEEN CLR. TWR THEN APOLOGIZED AND THEN CLRED US TO CONTINUE OUR TKOF, WHICH WE DID.

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.