Narrative:

Shortly after takeoff we experienced a transient electrical system failure. Within a few seconds all indications appeared normal. A very short time later we leveled at the assigned altitude of 10,000'. At this time the controller called us as being somewhat above 10,000'. All 3 of our altimeters indicated 10,000'. We were then cleared on a 050 degree heading to intercept the departure (dfw 067 degree radial) and a climb to 15,000'. We were intercepting the departure radial according to the FMC (RNAV) indications when the controller notified us we were not intercepting the proper radial. (He incorrectly assumed we were intercepting the 078 degree radial.) in fact, we later concluded the transient power loss had caused a shift in the FMC position which could be seen on the map display. About this time we experienced a failure of both eec's. In the confusion we exceeded the assigned 15,000' altitude momentarily by about 600' which was also called by the controller. I believe this is a classic example of a condition of multiple abnormalities where an altitude deviation occurs during the confusion.

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Original NASA ASRS Text

Title: ACR 2 ENGINE LGT EXPERIENCES ELECTRICAL SYSTEM MALFUNCTIONS AFTER TKOF. ALT DEVIATION.

Narrative: SHORTLY AFTER TKOF WE EXPERIENCED A TRANSIENT ELECTRICAL SYSTEM FAILURE. WITHIN A FEW SECONDS ALL INDICATIONS APPEARED NORMAL. A VERY SHORT TIME LATER WE LEVELED AT THE ASSIGNED ALT OF 10,000'. AT THIS TIME THE CTLR CALLED US AS BEING SOMEWHAT ABOVE 10,000'. ALL 3 OF OUR ALTIMETERS INDICATED 10,000'. WE WERE THEN CLRED ON A 050 DEG HDG TO INTERCEPT THE DEP (DFW 067 DEG RADIAL) AND A CLIMB TO 15,000'. WE WERE INTERCEPTING THE DEP RADIAL ACCORDING TO THE FMC (RNAV) INDICATIONS WHEN THE CTLR NOTIFIED US WE WERE NOT INTERCEPTING THE PROPER RADIAL. (HE INCORRECTLY ASSUMED WE WERE INTERCEPTING THE 078 DEG RADIAL.) IN FACT, WE LATER CONCLUDED THE TRANSIENT POWER LOSS HAD CAUSED A SHIFT IN THE FMC POSITION WHICH COULD BE SEEN ON THE MAP DISPLAY. ABOUT THIS TIME WE EXPERIENCED A FAILURE OF BOTH EEC'S. IN THE CONFUSION WE EXCEEDED THE ASSIGNED 15,000' ALT MOMENTARILY BY ABOUT 600' WHICH WAS ALSO CALLED BY THE CTLR. I BELIEVE THIS IS A CLASSIC EXAMPLE OF A CONDITION OF MULTIPLE ABNORMALITIES WHERE AN ALT DEVIATION OCCURS DURING THE CONFUSION.

Data retrieved from NASA's ASRS site as of August 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.