Flight crew returns to departure airport due to FMC failure. Return to land lax, ca.

Attributes
ACN	550585
Time
Date	200206
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	msl single value : 22000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
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	cruise : enroute altitude change
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 7150 flight time type : 300
ASRS Report	550585
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer observation : company check pilot
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : landed as precaution flight crew : diverted to another airport
Consequence	faa : reviewed incident with flight crew other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

I was receiving a navigation check from lax-phog by a company check airman. During climb, we were cleared to our first fix. Discovered right FMC was not working correctly and both were required for this leg. Performed procedures to correct malfunction with no luck. Told ATC we needed to return to lax and no emergency was declared. ATC vectored us until we burned enough fuel and were below maximum landing weight, then proceeded to lax. We landed uneventfully.

Original NASA ASRS Text

Title: FLC RETURNS TO DEP ARPT DUE TO FMC FAILURE. RETURN TO LAND LAX, CA.

Narrative: I WAS RECEIVING A NAV CHK FROM LAX-PHOG BY A COMPANY CHK AIRMAN. DURING CLB, WE WERE CLRED TO OUR FIRST FIX. DISCOVERED R FMC WAS NOT WORKING CORRECTLY AND BOTH WERE REQUIRED FOR THIS LEG. PERFORMED PROCS TO CORRECT MALFUNCTION WITH NO LUCK. TOLD ATC WE NEEDED TO RETURN TO LAX AND NO EMER WAS DECLARED. ATC VECTORED US UNTIL WE BURNED ENOUGH FUEL AND WERE BELOW MAX LNDG WT, THEN PROCEEDED TO LAX. WE LANDED UNEVENTFULLY.

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.