Flight crew of an medium large transport failed to follow their departure clearance due to a misunderstanding caused by not really hearing the actual clearance given by ATC and the controller not correcting their readback.

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Attributes
ACN	374360
Time
Date	199707
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : ulw
State Reference	NY
Altitude	msl bound lower : 20000 msl bound upper : 20000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny tower : cle
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 250 flight time total : 6500 flight time type : 250
ASRS Report	374360
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Controller cleared us direct ulw (so we thought and read back). Controller contended he cleared us direct upon reaching FL220 which we had been cleared to. A turn away and increased climb rate kept us from having a separation problem with another aircraft. We read back what we heard (cleared to FL220 and direct ulw) and controller heard what he wanted to hear which is (cleared to FL220 and direct to ulw upon reaching).

Original NASA ASRS Text

Title: FLC OF AN MLG FAILED TO FOLLOW THEIR DEP CLRNC DUE TO A MISUNDERSTANDING CAUSED BY NOT REALLY HEARING THE ACTUAL CLRNC GIVEN BY ATC AND THE CTLR NOT CORRECTING THEIR READBACK.

Narrative: CTLR CLRED US DIRECT ULW (SO WE THOUGHT AND READ BACK). CTLR CONTENDED HE CLRED US DIRECT UPON REACHING FL220 WHICH WE HAD BEEN CLRED TO. A TURN AWAY AND INCREASED CLB RATE KEPT US FROM HAVING A SEPARATION PROB WITH ANOTHER ACFT. WE READ BACK WHAT WE HEARD (CLRED TO FL220 AND DIRECT ULW) AND CTLR HEARD WHAT HE WANTED TO HEAR WHICH IS (CLRED TO FL220 AND DIRECT TO ULW UPON REACHING).

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.