A B767-200 is called off course by ZLC controller when the FMS had dropped out a portion of the route during the first officer's reprogramming of the pre departure clearance at sfo, ca.

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Attributes
ACN	467320
Time
Date	200003
Day	Sun
Local Time Of Day	1201 To 1800
Place
State Reference	CO
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc.artcc
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 15000 flight time type : 4400
ASRS Report	467320
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : multi engine pilot : instrument
Events
Anomaly	non adherence : clearance non adherence : company policies other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Original flight plan route correctly entered in FMC. When pre departure clearance received, revised segment said SFO8-sfo-lin J84 MVA. Copilot put revised segment in FMC unknowing the J84 dta route dropped out. At altitude, center said we were south of course. This was true. The 'J84 dta' dropped out so we were going MVA direct jnc. Must check route carefully.

Original NASA ASRS Text

Title: A B767-200 IS CALLED OFF COURSE BY ZLC CTLR WHEN THE FMS HAD DROPPED OUT A PORTION OF THE RTE DURING THE FO'S REPROGRAMMING OF THE PDC AT SFO, CA.

Narrative: ORIGINAL FLT PLAN RTE CORRECTLY ENTERED IN FMC. WHEN PDC RECEIVED, REVISED SEGMENT SAID SFO8-SFO-LIN J84 MVA. COPLT PUT REVISED SEGMENT IN FMC UNKNOWING THE J84 DTA RTE DROPPED OUT. AT ALT, CTR SAID WE WERE S OF COURSE. THIS WAS TRUE. THE 'J84 DTA' DROPPED OUT SO WE WERE GOING MVA DIRECT JNC. MUST CHK RTE CAREFULLY.

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.