<< >> NASA ASRS Report 633488, September 2004

Return and land with an overweight landing mandated by the flight crew of a B757-200 when both FMC's fail after flight departed from ZZZ.

Attributes
ACN	633488
Time
Date	200409
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax.airport
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 5000
Aircraft 1
Controlling Facilities	tracon : sct.tracon tower : lax.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	633488
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : landed as precaution flight crew : declared emergency flight crew : diverted to another airport other
Consequence	other other Other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After departure from ZZZ both FMC's failed. Unable to continue on tracks. Specifically both FMC's locked up in standby one prompt, switching to alternate FMC had no effect. Contacted maintenance control and dispatch after reviewing all normal and abnormal procedures. Based on maintenance control and dispatch advice, elected to return to ZZZ. As per FM part #1 declared emergency and returned for overweight landing. Overweight landing successful within published parameters. After landing, had arff follow to gate and check brakes. Maintenance took plane OTS.

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Original NASA ASRS Text

Title: RETURN AND LAND WITH AN OVERWT LNDG MANDATED BY THE FLT CREW OF A B757-200 WHEN BOTH FMC'S FAIL AFTER FLT DEPARTED FROM ZZZ.

Narrative: AFTER DEP FROM ZZZ BOTH FMC'S FAILED. UNABLE TO CONTINUE ON TRACKS. SPECIFICALLY BOTH FMC'S LOCKED UP IN STANDBY ONE PROMPT, SWITCHING TO ALTERNATE FMC HAD NO EFFECT. CONTACTED MAINT CTL AND DISPATCH AFTER REVIEWING ALL NORMAL AND ABNORMAL PROCS. BASED ON MAINT CTL AND DISPATCH ADVICE, ELECTED TO RETURN TO ZZZ. AS PER FM PART #1 DECLARED EMER AND RETURNED FOR OVERWT LNDG. OVERWT LNDG SUCCESSFUL WITHIN PUBLISHED PARAMETERS. AFTER LNDG, HAD ARFF FOLLOW TO GATE AND CHK BRAKES. MAINT TOOK PLANE OTS.

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.