An air carrier B727 flight crew turned the wrong direction when told to turn 15 degrees off their present heading. The flight crew turned left instead of right. The controller corrected them.

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Attributes
ACN	355930
Time
Date	199612
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pxn
State Reference	CA
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Route In Use	arrival other arrival star : star
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 4000
ASRS Report	355930
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : far non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

ATC issued us a clearance for what we believed was 15 degrees to the left of course for traffic. After turning 15 degrees left and flying for about 1 min, the controller asked us what our heading was and then said that the clearance was for 15 degrees to the right and issued a new heading change of 30 degrees to the right. I asked if anyone in the cockpit had heard the clearance as being originally to the right, no one in my crew had heard it that way -- including myself, who was flying.

Original NASA ASRS Text

Title: AN ACR B727 FLC TURNED THE WRONG DIRECTION WHEN TOLD TO TURN 15 DEGS OFF THEIR PRESENT HDG. THE FLC TURNED L INSTEAD OF R. THE CTLR CORRECTED THEM.

Narrative: ATC ISSUED US A CLRNC FOR WHAT WE BELIEVED WAS 15 DEGS TO THE L OF COURSE FOR TFC. AFTER TURNING 15 DEGS L AND FLYING FOR ABOUT 1 MIN, THE CTLR ASKED US WHAT OUR HDG WAS AND THEN SAID THAT THE CLRNC WAS FOR 15 DEGS TO THE R AND ISSUED A NEW HDG CHANGE OF 30 DEGS TO THE R. I ASKED IF ANYONE IN THE COCKPIT HAD HEARD THE CLRNC AS BEING ORIGINALLY TO THE R, NO ONE IN MY CREW HAD HEARD IT THAT WAY -- INCLUDING MYSELF, WHO WAS FLYING.

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.