<< >> NASA ASRS Report 974903, October 2011

An ETOPS departure held offshore while the flight crew and dispatch considered the implications of tat and eec EICAS messages received after takeoff. They opted to return to their departure airport and land overweight. Maintenance found the tat circuit breaker open.

Attributes
ACN	974903
Time
Date	201110
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Autothrottle/Speed Control
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

After takeoff the auto throttle disconnect message appeared followed by the tat probe message and then the eec message. [We] climbed to safe altitude offshore to diagnose. Determined the aircraft was not capable of ETOPS flight and several components including the air data computer and FMC were unreliable. [We] conferred with dispatch that we should return immediately. [We] declared emergency to cover the overweight landing. Return to base was uneventful.

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Original NASA ASRS Text

Title: An ETOPS departure held offshore while the Flight Crew and Dispatch considered the implications of TAT and EEC EICAS messages received after takeoff. They opted to return to their departure airport and land overweight. Maintenance found the TAT circuit breaker open.

Narrative: After takeoff the auto throttle disconnect message appeared followed by the TAT probe message and then the EEC message. [We] climbed to safe altitude offshore to diagnose. Determined the aircraft was not capable of ETOPS flight and several components including the ADC and FMC were unreliable. [We] conferred with Dispatch that we should return immediately. [We] declared emergency to cover the overweight landing. Return to base was uneventful.

Data retrieved from NASA's ASRS site as of April 2012 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.