2 smts tried to take off with the same clearance.

Attributes
ACN	272581
Time
Date	199405
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : yip
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tower : sap
Operator	common carrier : air taxi
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	other
Flight Plan	IFR
Aircraft 2
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	other : unknown
Flight Phase	other
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 13000 flight time type : 3000
ASRS Report	272581
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : ground critical non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : rejected takeoff other
Consequence	Other
Miss Distance	horizontal : 1500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was captain and flying pilot on learjet abc. We were departing willow run airport, part 91, to louisville, ky, to pick up freight. It was raining with 2.5 mi visibility. We were cleared into position on runway 23L. Moments later we received what we thought was our takeoff clearance. The first officer acknowledged the clearance by saying 'abc cleared for takeoff.' at about 100 KTS, we received a call from tower 'cancel takeoff clearance.' I aborted the takeoff. As we were coming to a stop on 23L, just short of the intersection of 32, another learjet was also coming to a stop on 32. I was not aware of the other learjet in position on 32. Apparently, when the takeoff clearance was given, it was for BBB. The first officer thought it was for abc and read back the takeoff clearance. Hearing no response from tower, we had no reason to believe that the clearance was not for abc. Perhaps our acknowledgement of the clearance was blocked by BBB also acknowledging the same clearance or there may have been some problem with confusion between the 2 numbers. Later that morning at sdf, we followed BBB out for takeoff and both tower and departure control were confusing the 2 numbers. The quick action of the controller, and the immediate response of 2 flight crew crews, prevented what could have been a fatal accident.

Original NASA ASRS Text

Title: 2 SMTS TRIED TO TAKE OFF WITH THE SAME CLRNC.

Narrative: I WAS CAPT AND FLYING PLT ON LEARJET ABC. WE WERE DEPARTING WILLOW RUN ARPT, PART 91, TO LOUISVILLE, KY, TO PICK UP FREIGHT. IT WAS RAINING WITH 2.5 MI VISIBILITY. WE WERE CLRED INTO POS ON RWY 23L. MOMENTS LATER WE RECEIVED WHAT WE THOUGHT WAS OUR TKOF CLRNC. THE FO ACKNOWLEDGED THE CLRNC BY SAYING 'ABC CLRED FOR TKOF.' AT ABOUT 100 KTS, WE RECEIVED A CALL FROM TWR 'CANCEL TKOF CLRNC.' I ABORTED THE TKOF. AS WE WERE COMING TO A STOP ON 23L, JUST SHORT OF THE INTXN OF 32, ANOTHER LEARJET WAS ALSO COMING TO A STOP ON 32. I WAS NOT AWARE OF THE OTHER LEARJET IN POS ON 32. APPARENTLY, WHEN THE TKOF CLRNC WAS GIVEN, IT WAS FOR BBB. THE FO THOUGHT IT WAS FOR ABC AND READ BACK THE TKOF CLRNC. HEARING NO RESPONSE FROM TWR, WE HAD NO REASON TO BELIEVE THAT THE CLRNC WAS NOT FOR ABC. PERHAPS OUR ACKNOWLEDGEMENT OF THE CLRNC WAS BLOCKED BY BBB ALSO ACKNOWLEDGING THE SAME CLRNC OR THERE MAY HAVE BEEN SOME PROB WITH CONFUSION BTWN THE 2 NUMBERS. LATER THAT MORNING AT SDF, WE FOLLOWED BBB OUT FOR TKOF AND BOTH TWR AND DEP CTL WERE CONFUSING THE 2 NUMBERS. THE QUICK ACTION OF THE CTLR, AND THE IMMEDIATE RESPONSE OF 2 FLC CREWS, PREVENTED WHAT COULD HAVE BEEN A FATAL ACCIDENT.

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.