<< >> NASA ASRS Report 714332, October 2006

A B757-200 on arrival to lax deviated from course when their runway assignment was changed; requiring a reprogramming of the FMC.

Attributes
ACN	714332
Time
Date	200610
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 17000
Environment
Flight Conditions	Marginal
Aircraft 1
Controlling Facilities	tracon : sct.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : seavu
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 25 flight time total : 14500 flight time type : 900
ASRS Report	714332
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended or assigned course
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Ambiguous

Narrative:

While on the seavu arrival planning runway 25L; approach advised us to expect runway 25R. The first officer; PNF; entered the runway change in the FMC. However; the FMC dropped the seavu arrival out of the box. It took us about 1 minute to reinstall the arrival properly. While I flew in heading select we drifted slightly west of seavu intersection because it was not yet depicted on the map navigation display. As the seavu arrival was re-installed it was then apparent that we had drifted slightly west of the intersection. ATC advised that we were off course and cleared us direct to musik intersection. We advised ATC that the arrival had dropped out of the box and were now proceeding direct to musik. ATC said there was no problem or traffic conflicts. Obviously; there was not time in this environment to tune radios in time to identify seavu intersection.

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Original NASA ASRS Text

Title: A B757-200 ON ARR TO LAX DEVIATED FROM COURSE WHEN THEIR RWY ASSIGNMENT WAS CHANGED; REQUIRING A REPROGRAMMING OF THE FMC.

Narrative: WHILE ON THE SEAVU ARRIVAL PLANNING RWY 25L; APPROACH ADVISED US TO EXPECT RWY 25R. THE FO; PNF; ENTERED THE RUNWAY CHANGE IN THE FMC. HOWEVER; THE FMC DROPPED THE SEAVU ARRIVAL OUT OF THE BOX. IT TOOK US ABOUT 1 MINUTE TO REINSTALL THE ARRIVAL PROPERLY. WHILE I FLEW IN HEADING SELECT WE DRIFTED SLIGHTLY WEST OF SEAVU INTERSECTION BECAUSE IT WAS NOT YET DEPICTED ON THE MAP NAV DISPLAY. AS THE SEAVU ARRIVAL WAS RE-INSTALLED IT WAS THEN APPARENT THAT WE HAD DRIFTED SLIGHTLY WEST OF THE INTERSECTION. ATC ADVISED THAT WE WERE OFF COURSE AND CLEARED US DIRECT TO MUSIK INTERSECTION. WE ADVISED ATC THAT THE ARRIVAL HAD DROPPED OUT OF THE BOX AND WERE NOW PROCEEDING DIRECT TO MUSIK. ATC SAID THERE WAS NO PROBLEM OR TRAFFIC CONFLICTS. OBVIOUSLY; THERE WAS NOT TIME IN THIS ENVIRONMENT TO TUNE RADIOS IN TIME TO IDENTIFY SEAVU INTERSECTION.

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.