<< >> NASA ASRS Report 869299, January 2010

Two remote circuit breakers popped in a MD11's electronics compartment inaccessible to the crew. Multiple disparate components were inoperative confusing the crew about the malfunction's origin. An emergency was declared followed by a return to land.

Attributes
ACN	869299
Time
Date	201001
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	MD-11
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	Other Controlled
Flight Plan	IFR
Component
Aircraft Component	Circuit Breaker / Fuse / Thermocouple
Person 1
Function	Captain Pilot Flying
Experience	Flight Crew Last 90 Days 20 Flight Crew Total 10000 Flight Crew Type 2500
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

During climb we received a miscellaneous alert single land; with no other malfunctions indicated. Once level at fl 320 we received a hydraulic 3 pres lo followed by a hydraulic 3 off alert. Multiple malfunctions; including hydraulic system 3 isol; yaw damp upr B;yaw damp lwr B; avionics fan ovrd; engine 3 fadec fault; FCC 2A data fault; FCC 2B data fault; then appeared. We also received multiple aural tire failure alerts. Autopilots were not available; so first officer assumed the flying duties and descended to fl 280 while I accomplished checklists and attempted to troubleshoot with the 2 md-11 qualified jump seating crew members. Electrical synoptic appeared normal and no resolution to the problems was obvious; however aircraft handling was normal. I contacted maintenance and dispatch via satcom and I decided to declare an emergency and return to our departure airport. We dumped approximately 9000 lbs. Of fuel and we landed uneventfully.

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Original NASA ASRS Text

Title: Two remote circuit breakers popped in a MD11's electronics compartment inaccessible to the crew. Multiple disparate components were inoperative confusing the crew about the malfunction's origin. An emergency was declared followed by a return to land.

Narrative: During climb we received a miscellaneous alert SINGLE LAND; with no other malfunctions indicated. Once level at FL 320 we received a HYD 3 PRES LO followed by a HYD 3 OFF alert. Multiple malfunctions; including HYD SYS 3 ISOL; YAW DAMP UPR B;YAW DAMP LWR B; AVIONICS FAN OVRD; ENG 3 FADEC FAULT; FCC 2A DATA FAULT; FCC 2B DATA FAULT; then appeared. We also received multiple aural Tire Failure alerts. Autopilots were not available; so First Officer assumed the flying duties and descended to FL 280 while I accomplished checklists and attempted to troubleshoot with the 2 MD-11 qualified jump seating crew members. Electrical synoptic appeared normal and no resolution to the problems was obvious; however aircraft handling was normal. I contacted Maintenance and Dispatch via SATCOM and I decided to declare an emergency and return to our departure airport. We dumped approximately 9000 lbs. of fuel and we landed uneventfully.

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.