An air carrier is discovered to be 15 miles off course while following RNAV indications that were incorrect as a result of part of the departure route being dropped out of the FMC when a direct course was entered.

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Attributes
ACN	527940
Time
Date	200110
Day	Mon
Place
Locale Reference	atc facility : zab.artcc
State Reference	NM
Altitude	msl single value : 27000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 2100 flight time type : 600
ASRS Report	527940
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure other spatial deviation
Resolutory Action	controller : issued advisory flight crew : returned to original clearance
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After departing phx we were given a heading of 020 degrees to intercept the phx 034 radial. After intercepting this radial we were given a clearance to fly direct zuni intersection. When we entered this into the FMS it apparently removed the rest of the departure procedure. After zuni the FMS turned us direct to laa instead of fmn. ATC advised we were off course so we corrected and resumed the flight without incident. We were approximately 15 miles east of course when advised by ATC.

Original NASA ASRS Text

Title: AN ACR IS DISCOVERED TO BE 15 MILES OFF COURSE WHILE FOLLOWING RNAV INDICATIONS THAT WERE INCORRECT AS A RESULT OF PART OF THE DEP RTE BEING DROPPED OUT OF THE FMC WHEN A DIRECT COURSE WAS ENTERED.

Narrative: AFTER DEPARTING PHX WE WERE GIVEN A HEADING OF 020 DEGS TO INTERCEPT THE PHX 034 RADIAL. AFTER INTERCEPTING THIS RADIAL WE WERE GIVEN A CLRNC TO FLY DIRECT ZUNI INTXN. WHEN WE ENTERED THIS INTO THE FMS IT APPARENTLY REMOVED THE REST OF THE DEP PROC. AFTER ZUNI THE FMS TURNED US DIRECT TO LAA INSTEAD OF FMN. ATC ADVISED WE WERE OFF COURSE SO WE CORRECTED AND RESUMED THE FLT WITHOUT INCIDENT. WE WERE APPROX 15 MILES E OF COURSE WHEN ADVISED BY ATC.

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.