Air carrier medium large transport flight crew did not make a walkaround preflight inspection as planned due to the one believing that the other had conducted it.

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Attributes
ACN	500930
Time
Date	200102
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	500930
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	non adherence : far non adherence : published procedure non adherence : company policies non adherence other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I volunteered to do the walkaround, the first officer responded 'I am going outside anyway.' I responded 'ok.' the first officer thought I was going to do the walkaround and I thought he was going to do the walkaround. Not until we were at cruise did we realize we departed without a preflight. The flight was normal. The confusion was caused by a misunderstanding. The communication problem occurred as the passenger were exiting the aircraft, and we were thanking the flight attendant. The mistake was an honest mistake -- I did not think we had a problem and neither did the first officer. A simple communication problem can result in an error.

Original NASA ASRS Text

Title: ACR MLG FLC DID NOT MAKE A WALKAROUND PREFLT INSPECTION AS PLANNED DUE TO THE ONE BELIEVING THAT THE OTHER HAD CONDUCTED IT.

Narrative: I VOLUNTEERED TO DO THE WALKAROUND, THE FO RESPONDED 'I AM GOING OUTSIDE ANYWAY.' I RESPONDED 'OK.' THE FO THOUGHT I WAS GOING TO DO THE WALKAROUND AND I THOUGHT HE WAS GOING TO DO THE WALKAROUND. NOT UNTIL WE WERE AT CRUISE DID WE REALIZE WE DEPARTED WITHOUT A PREFLT. THE FLT WAS NORMAL. THE CONFUSION WAS CAUSED BY A MISUNDERSTANDING. THE COM PROB OCCURRED AS THE PAX WERE EXITING THE ACFT, AND WE WERE THANKING THE FLT ATTENDANT. THE MISTAKE WAS AN HONEST MISTAKE -- I DID NOT THINK WE HAD A PROB AND NEITHER DID THE FO. A SIMPLE COM PROB CAN RESULT IN AN ERROR.

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.