DC9-30 crew aborted takeoff when a learjet taxied across their takeoff runway.

Attributes
ACN	495406
Time
Date	200012
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : pit.airport
State Reference	PA
Altitude	agl single value : 0
Environment
Flight Conditions	IMC
Weather Elements	Snow
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : pit.tower
Operator	general aviation : corporate
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	ground : taxi
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp pilot : flight engineer pilot : commercial pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 15000 flight time type : 8000
ASRS Report	495406
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 2300 flight time type : 780
ASRS Report	495575
Events
Anomaly	conflict : ground critical ground encounters other incursion : runway inflight encounter : weather inflight encounter other non adherence : published procedure non adherence : far non adherence : clearance other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : took evasive action flight crew : rejected takeoff none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 800 vertical : 0
Supplementary
Problem Areas	Flight Crew Human Performance Weather ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At approximately XA45 we were cleared for takeoff from runway 28C full length. At about 50 KTS the copilot called out an aircraft on the runway. A learjet was crossing the runway at taxiway P. He was moving from left to right. His tail was on the centerline. I aborted the takeoff and the lear was off the runway when we got abeam taxiway P. Tower called the lear several times asking what taxiway he was on. Tower thought he was crossing at taxiway south. We cleared the runway without further incident. Supplemental information from acn 495575: flight xyz (pit-stl). We received takeoff clearance on runway 28C full length. At approximately 50 KTS, I (first officer flying) called out an aircraft crossing our runway left to right at taxiway P. The captain aborted the takeoff. The learjet was off the runway when we passed taxiway P. Pit tower thought the aircraft had crossed runway 28C at taxiway south, and was clear of the runway. We had not exceeded our deicing holdover time and departed for st louis without any further problems. The WX at the time was approximately 1 SM and light snow, ceiling 1000 ft.

Original NASA ASRS Text

Title: DC9-30 CREW ABORTED TKOF WHEN A LEARJET TAXIED ACROSS THEIR TKOF RWY.

Narrative: AT APPROX XA45 WE WERE CLRED FOR TKOF FROM RWY 28C FULL LENGTH. AT ABOUT 50 KTS THE COPLT CALLED OUT AN ACFT ON THE RWY. A LEARJET WAS XING THE RWY AT TXWY P. HE WAS MOVING FROM L TO R. HIS TAIL WAS ON THE CTRLINE. I ABORTED THE TKOF AND THE LEAR WAS OFF THE RWY WHEN WE GOT ABEAM TXWY P. TWR CALLED THE LEAR SEVERAL TIMES ASKING WHAT TXWY HE WAS ON. TWR THOUGHT HE WAS XING AT TXWY S. WE CLRED THE RWY WITHOUT FURTHER INCIDENT. SUPPLEMENTAL INFO FROM ACN 495575: FLT XYZ (PIT-STL). WE RECEIVED TKOF CLRNC ON RWY 28C FULL LENGTH. AT APPROX 50 KTS, I (FO FLYING) CALLED OUT AN ACFT XING OUR RWY L TO R AT TXWY P. THE CAPT ABORTED THE TKOF. THE LEARJET WAS OFF THE RWY WHEN WE PASSED TXWY P. PIT TWR THOUGHT THE ACFT HAD CROSSED RWY 28C AT TXWY S, AND WAS CLR OF THE RWY. WE HAD NOT EXCEEDED OUR DEICING HOLDOVER TIME AND DEPARTED FOR ST LOUIS WITHOUT ANY FURTHER PROBS. THE WX AT THE TIME WAS APPROX 1 SM AND LIGHT SNOW, CEILING 1000 FT.

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.