EMB135 flight crew has takeoff clearance canceled from the tower at lga.

Attributes
ACN	715092
Time
Date	200610
Place
Locale Reference	airport : lga.airport
State Reference	NY
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	715092
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : ground less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : rejected takeoff
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Airport
Primary Problem	Ambiguous

Narrative:

While taxiing to runway 4 for takeoff; we received clearance to take off. Very shortly after beginning a rolling takeoff; we heard a radio transmission on tower frequency that sounded like 'cancel; guys.' this was followed very shortly by another transmission that sounded like 'cancel.' we then heard a third transmission that clearly sounded like 'did you get your clearance?' I decided to abort the takeoff; and we began the abort at about 50 KTS. The abort was done smoothly without extremely hard braking. After a short delay on the runway to get tower guidance; we taxied clear of the runway to the left at taxiway Y. We then began a short taxi back to the runway for takeoff. Without any hot brakes or other mechanical discrepancy; we concluded that it was safe to proceed on to pit. At pit; I telephoned lga tower. They explained that they made several calls using normal terminology; such as 'cancel takeoff clearance;' but that these xmissions must have been stepped on by other radio traffic. They had also sent around landing traffic (runway 31) because they couldn't confirm that we were aborting our takeoff.

Original NASA ASRS Text

Title: EMB135 FLT CREW HAS TKOF CLRNC CANCELED FROM THE TWR AT LGA.

Narrative: WHILE TAXIING TO RWY 4 FOR TKOF; WE RECEIVED CLRNC TO TAKE OFF. VERY SHORTLY AFTER BEGINNING A ROLLING TKOF; WE HEARD A RADIO XMISSION ON TWR FREQ THAT SOUNDED LIKE 'CANCEL; GUYS.' THIS WAS FOLLOWED VERY SHORTLY BY ANOTHER XMISSION THAT SOUNDED LIKE 'CANCEL.' WE THEN HEARD A THIRD XMISSION THAT CLRLY SOUNDED LIKE 'DID YOU GET YOUR CLRNC?' I DECIDED TO ABORT THE TKOF; AND WE BEGAN THE ABORT AT ABOUT 50 KTS. THE ABORT WAS DONE SMOOTHLY WITHOUT EXTREMELY HARD BRAKING. AFTER A SHORT DELAY ON THE RWY TO GET TWR GUIDANCE; WE TAXIED CLR OF THE RWY TO THE L AT TXWY Y. WE THEN BEGAN A SHORT TAXI BACK TO THE RWY FOR TKOF. WITHOUT ANY HOT BRAKES OR OTHER MECHANICAL DISCREPANCY; WE CONCLUDED THAT IT WAS SAFE TO PROCEED ON TO PIT. AT PIT; I TELEPHONED LGA TWR. THEY EXPLAINED THAT THEY MADE SEVERAL CALLS USING NORMAL TERMINOLOGY; SUCH AS 'CANCEL TKOF CLRNC;' BUT THAT THESE XMISSIONS MUST HAVE BEEN STEPPED ON BY OTHER RADIO TFC. THEY HAD ALSO SENT AROUND LNDG TFC (RWY 31) BECAUSE THEY COULDN'T CONFIRM THAT WE WERE ABORTING OUR TKOF.

Data retrieved from NASA's ASRS site as of January 2009 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.