An air carrier turns 5 mi early on the departure from phx, az, after confusing the distance used for an east departure with the correct one to the west.

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Attributes
ACN	507770
Time
Date	200104
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : pxr.vortac
State Reference	AZ
Altitude	msl bound lower : 4000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 185 flight time total : 13144 flight time type : 3859
ASRS Report	507770
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Copilot flying on departure thought the turn DME was 4 DME which it is to the east. The DME turn to the west is 9 DME and the turn was started 5 DME early.

Original NASA ASRS Text

Title: AN ACR TURNS 5 MI EARLY ON THE DEP FROM PHX, AZ, AFTER CONFUSING THE DISTANCE USED FOR AN E DEP WITH THE CORRECT ONE TO THE W.

Narrative: COPLT FLYING ON DEP THOUGHT THE TURN DME WAS 4 DME WHICH IT IS TO THE E. THE DME TURN TO THE W IS 9 DME AND THE TURN WAS STARTED 5 DME EARLY.

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.