A B757 pilot reports a lax late runway change caused a heading change when waypoints drop. The aircraft was 2.5 NM off of course when programming was complete.

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Attributes
ACN	728397
Time
Date	200702
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : sct.tracon
State Reference	CA
Altitude	msl single value : 17000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival : on vectors arrival star : n/s
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 10000 flight time type : 3000
ASRS Report	728397
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : insufficient time
Supplementary
Problem Areas	Airport Chart Or Publication ATC Human Performance
Primary Problem	ATC Human Performance
Situations
ATC Facility	other physical facility

Narrative:

Socal changed arrival STAR approaching the fix (approximately 2 NM). First officer goes to change FMS and it goes to 'stby.' by the time new arrival STAR is activated; aircraft is 2.5 NM off course.

Original NASA ASRS Text

Title: A B757 PLT RPTS A LAX LATE RWY CHANGE CAUSED A HDG CHANGE WHEN WAYPOINTS DROP. THE ACFT WAS 2.5 NM OFF OF COURSE WHEN PROGRAMMING WAS COMPLETE.

Narrative: SOCAL CHANGED ARR STAR APCHING THE FIX (APPROX 2 NM). FO GOES TO CHANGE FMS AND IT GOES TO 'STBY.' BY THE TIME NEW ARR STAR IS ACTIVATED; ACFT IS 2.5 NM OFF COURSE.

Data retrieved from NASA's ASRS site as of January 2009 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.