Narrative:

PIC checked ASOS for field conditions, started engine, taxied to run-up for runway 33. Winds variable and light, visibility over 10 mi, ceiling clear below 12000 ft MSL. At run-up, PIC noted no adverse conditions, leaned engine for density altitude. Engine seemed to generate acceptable power. PIC positioned aircraft at end of runway 33, and engaged full throttle for takeoff. Takeoff roll proceeded without incident, and aircraft rotated at approximately 65 mph. Aircraft proceeded in climb to approximately 50 ft AGL, when engine suddenly and inexplicably reduced power generation while PIC had throttle in full power position. PIC observed airspeed decreasing below 60 mph, lowered nose to maintain flying speed and commenced landing procedure. PIC maneuvered aircraft to initial contact with land at end of runway 33, then continued on run-out area beyond end of runway 33 on loose dirt, softened by recent rain. Aircraft decelerated for approximately 150 yards. PIC turned aircraft to left to avoid steep drop-off of terrain. After turn completed, aircraft stopped in nose down position after nose gear broke off. PIC opened canopy. Passenger departed aircraft while PIC shut off master switch and turned gas position to off, then PIC departed aircraft. No injuries sustained by PIC or any passenger. Damage to aircraft: bent propeller (2 blade), nosewheel broken off, fork broken, spinner deformed, nose bowl damaged, lower cowling damaged, minor wrinkle in left wing at leading edge and on lower edge of wing, approximately 24 inches inboard from tip tank. No damage to tip tanks, and no fluids leaked from aircraft. No structural damage observed. Preventive measures to reduce risk of incident in future: aircraft damage incurred as consequence of aircraft departing paved runway. PIC should generate aircraft performance charts for this aircraft and calculate compensation factors for density altitude and weight loads. PIC should calculate maximum acceptable takeoff distances to determine when to abort any takeoff within distance to remain on runway surface. PIC must assume every takeoff may require an abort and prepare to abort immediately without delay on every takeoff procedure. PIC must identify cause of power loss on takeoff and perform all necessary corrections.

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Original NASA ASRS Text

Title: A NAVION PIC, DEPARTING PGA, EXPERIENCED AN ENG MALFUNCTION AND ATTEMPTED TO LAND BACK ON RWY 33 RESULTING IN A RWY EXCURSION.

Narrative: PIC CHKED ASOS FOR FIELD CONDITIONS, STARTED ENG, TAXIED TO RUN-UP FOR RWY 33. WINDS VARIABLE AND LIGHT, VISIBILITY OVER 10 MI, CEILING CLR BELOW 12000 FT MSL. AT RUN-UP, PIC NOTED NO ADVERSE CONDITIONS, LEANED ENG FOR DENSITY ALT. ENG SEEMED TO GENERATE ACCEPTABLE PWR. PIC POSITIONED ACFT AT END OF RWY 33, AND ENGAGED FULL THROTTLE FOR TKOF. TKOF ROLL PROCEEDED WITHOUT INCIDENT, AND ACFT ROTATED AT APPROX 65 MPH. ACFT PROCEEDED IN CLB TO APPROX 50 FT AGL, WHEN ENG SUDDENLY AND INEXPLICABLY REDUCED PWR GENERATION WHILE PIC HAD THROTTLE IN FULL PWR POS. PIC OBSERVED AIRSPD DECREASING BELOW 60 MPH, LOWERED NOSE TO MAINTAIN FLYING SPD AND COMMENCED LNDG PROC. PIC MANEUVERED ACFT TO INITIAL CONTACT WITH LAND AT END OF RWY 33, THEN CONTINUED ON RUN-OUT AREA BEYOND END OF RWY 33 ON LOOSE DIRT, SOFTENED BY RECENT RAIN. ACFT DECELERATED FOR APPROX 150 YARDS. PIC TURNED ACFT TO L TO AVOID STEEP DROP-OFF OF TERRAIN. AFTER TURN COMPLETED, ACFT STOPPED IN NOSE DOWN POS AFTER NOSE GEAR BROKE OFF. PIC OPENED CANOPY. PAX DEPARTED ACFT WHILE PIC SHUT OFF MASTER SWITCH AND TURNED GAS POS TO OFF, THEN PIC DEPARTED ACFT. NO INJURIES SUSTAINED BY PIC OR ANY PAX. DAMAGE TO ACFT: BENT PROP (2 BLADE), NOSEWHEEL BROKEN OFF, FORK BROKEN, SPINNER DEFORMED, NOSE BOWL DAMAGED, LOWER COWLING DAMAGED, MINOR WRINKLE IN L WING AT LEADING EDGE AND ON LOWER EDGE OF WING, APPROX 24 INCHES INBOARD FROM TIP TANK. NO DAMAGE TO TIP TANKS, AND NO FLUIDS LEAKED FROM ACFT. NO STRUCTURAL DAMAGE OBSERVED. PREVENTIVE MEASURES TO REDUCE RISK OF INCIDENT IN FUTURE: ACFT DAMAGE INCURRED AS CONSEQUENCE OF ACFT DEPARTING PAVED RWY. PIC SHOULD GENERATE ACFT PERFORMANCE CHARTS FOR THIS ACFT AND CALCULATE COMPENSATION FACTORS FOR DENSITY ALT AND WT LOADS. PIC SHOULD CALCULATE MAX ACCEPTABLE TKOF DISTANCES TO DETERMINE WHEN TO ABORT ANY TKOF WITHIN DISTANCE TO REMAIN ON RWY SURFACE. PIC MUST ASSUME EVERY TKOF MAY REQUIRE AN ABORT AND PREPARE TO ABORT IMMEDIATELY WITHOUT DELAY ON EVERY TKOF PROC. PIC MUST IDENT CAUSE OF PWR LOSS ON TKOF AND PERFORM ALL NECESSARY CORRECTIONS.

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.