B737 flight crew deviates from course after runway change on civet arrival.

Attributes
ACN	743279
Time
Date	200706
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 2200
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	arrival star : civet
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 167
ASRS Report	743279
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended or assigned course
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure Chart Or Publication
Primary Problem	Flight Crew Human Performance

Narrative:

We changed our runway in the FMC from 25L to 24R. We thought we had closed all discontinuities but had not. When I made the correction; I forgot to re-select LNAV. We were told by ATC we were left of course; and to turn right to intercept the localizer. The civet arrival is very busy. After turning to a heading of 260 degrees after civet (in the box) selecting VOR/localizer would have prevented this mistake. We could have followed the progress on the legs page and on the map; but would have been protected from and route discontinuities.

Original NASA ASRS Text

Title: B737 FLT CREW DEVIATES FROM COURSE AFTER RWY CHANGE ON CIVET ARR.

Narrative: WE CHANGED OUR RWY IN THE FMC FROM 25L TO 24R. WE THOUGHT WE HAD CLOSED ALL DISCONTINUITIES BUT HAD NOT. WHEN I MADE THE CORRECTION; I FORGOT TO RE-SELECT LNAV. WE WERE TOLD BY ATC WE WERE LEFT OF COURSE; AND TO TURN RIGHT TO INTERCEPT THE LOC. THE CIVET ARR IS VERY BUSY. AFTER TURNING TO A HEADING OF 260 DEGS AFTER CIVET (IN THE BOX) SELECTING VOR/LOC WOULD HAVE PREVENTED THIS MISTAKE. WE COULD HAVE FOLLOWED THE PROGRESS ON THE LEGS PAGE AND ON THE MAP; BUT WOULD HAVE BEEN PROTECTED FROM AND ROUTE DISCONTINUITIES.

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.