Power loss on takeoff. Emergency landing on highway.

Attributes
ACN	282744
Time
Date	199409
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bke
State Reference	OR
Altitude	agl bound lower : 0 agl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 6000
ASRS Report	282744
Person 2
Affiliation	Other
Function	other personnel
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

I did a preflight on the aircraft prior to takeoff. I taxied out to runway 30. I did a normal runup and everything appeared normal. After takeoff about 200 ft AGL, the aircraft engine began to lose power. At the point of partial power loss, there was not enough runway remaining to land. Interstate I-84 runs adjacent to the airport. I flew the aircraft over the freeway and landed in the wbound lanes, without any accident to persons or property. We taxied the aircraft by police escort back to the baker airport. FBO employed mechanic suspected possible magneto problems. Upon inspection, the l-hand magneto coil had been arcing across inside the magneto case. The mechanic then inspected the r-hand magneto and found some deterioration of some of the components in the r-hand magneto also. With this particular situation we came to the conclusion that the aircraft engine was not receiving the required amount of ignition to sustain full power. Therefore causing a fuel flooding, misfire situation. Both magnetos were rebuilt, a ground and test flight was performed and checked out ok. The mechanic had noted, 'he never seen a magneto have a problem such as this.' this aircraft is operated both part 91 and 135, and receives the required 50 and 100 hour inspections. I notified the boise FAA FSDO about the incident.

Original NASA ASRS Text

Title: PWR LOSS ON TKOF. EMER LNDG ON HWY.

Narrative: I DID A PREFLT ON THE ACFT PRIOR TO TKOF. I TAXIED OUT TO RWY 30. I DID A NORMAL RUNUP AND EVERYTHING APPEARED NORMAL. AFTER TKOF ABOUT 200 FT AGL, THE ACFT ENG BEGAN TO LOSE PWR. AT THE POINT OF PARTIAL PWR LOSS, THERE WAS NOT ENOUGH RWY REMAINING TO LAND. INTERSTATE I-84 RUNS ADJACENT TO THE ARPT. I FLEW THE ACFT OVER THE FREEWAY AND LANDED IN THE WBOUND LANES, WITHOUT ANY ACCIDENT TO PERSONS OR PROPERTY. WE TAXIED THE ACFT BY POLICE ESCORT BACK TO THE BAKER ARPT. FBO EMPLOYED MECH SUSPECTED POSSIBLE MAGNETO PROBS. UPON INSPECTION, THE L-HAND MAGNETO COIL HAD BEEN ARCING ACROSS INSIDE THE MAGNETO CASE. THE MECH THEN INSPECTED THE R-HAND MAGNETO AND FOUND SOME DETERIORATION OF SOME OF THE COMPONENTS IN THE R-HAND MAGNETO ALSO. WITH THIS PARTICULAR SIT WE CAME TO THE CONCLUSION THAT THE ACFT ENG WAS NOT RECEIVING THE REQUIRED AMOUNT OF IGNITION TO SUSTAIN FULL PWR. THEREFORE CAUSING A FUEL FLOODING, MISFIRE SIT. BOTH MAGNETOS WERE REBUILT, A GND AND TEST FLT WAS PERFORMED AND CHKED OUT OK. THE MECH HAD NOTED, 'HE NEVER SEEN A MAGNETO HAVE A PROB SUCH AS THIS.' THIS ACFT IS OPERATED BOTH PART 91 AND 135, AND RECEIVES THE REQUIRED 50 AND 100 HR INSPECTIONS. I NOTIFIED THE BOISE FAA FSDO ABOUT THE INCIDENT.

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.