An air carrier B767 flight crew pushed back without authority/authorized.

Attributes
ACN	384050
Time
Date	199710
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lgw
State Reference	FO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain other personnel other
Qualification	pilot : atp
ASRS Report	384050
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	384049
Events
Anomaly	non adherence : far non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I thought that clearance had cleared us to push back then contact ground, they had not. Evidently we had only been cleared to start. I passed the wrong information on to the captain and we commenced a push without a legal clearance. I shall certainly be more vigilant next time. Supplemental information from acn 384049: incorrectly interpreted start clearance as a push and start clearance. Pushed back without proper clearance. Should have paid more attention to radio calls. I was flying leg and I just didn't listen close enough.

Original NASA ASRS Text

Title: AN ACR B767 FLC PUSHED BACK WITHOUT AUTH.

Narrative: I THOUGHT THAT CLRNC HAD CLRED US TO PUSH BACK THEN CONTACT GND, THEY HAD NOT. EVIDENTLY WE HAD ONLY BEEN CLRED TO START. I PASSED THE WRONG INFO ON TO THE CAPT AND WE COMMENCED A PUSH WITHOUT A LEGAL CLRNC. I SHALL CERTAINLY BE MORE VIGILANT NEXT TIME. SUPPLEMENTAL INFO FROM ACN 384049: INCORRECTLY INTERPRETED START CLRNC AS A PUSH AND START CLRNC. PUSHED BACK WITHOUT PROPER CLRNC. SHOULD HAVE PAID MORE ATTN TO RADIO CALLS. I WAS FLYING LEG AND I JUST DIDN'T LISTEN CLOSE ENOUGH.

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.