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Brandon, FL
THE ACFT COLLIDED WITH TREES AND THE GROUND AFTER THE ENGINE LOST POWER DURING TAKEOFF. THE CFI NOTED THE RPM DROPPING TO 2000 WITH FULL THROTTLE AND AT ABOUT 75 AGL AND TRIED TO ARREST THE DESCENT WITH FLAPS BUT WAS UNSUCCESSFUL. ONE TAKEOFF HAD BEEN ABORTED DUE TO POOR ACCELERATION BUT THE CFI HAD THOUGHT IT WAS IMPROPER THROTTLE TECHNIQUE ON THE PARTOF THE STUDENT. POST ACCIDENT ENGINE EXAMINATION REVEALED OLD TYPE VALVE SPRINGS INSTALLED THAT SHOULD HAVE BEEN REPLACED BY PN LW11800. A MECHANIC HAD INSTALLED NEW SPRINGS BUT OF AN INCORRECT TYPE WITH INCORRECT COLOR CODING. AVCO LYCOMING SERVICE INSTRUCTION 1240B CALLED FOR THE CHANGE TO IMPROVE ENGINE PERFORMANCE WITH THE RECOMMENDED IMPROVED VALVE SPRINGS.
THE ACFT COLLIDED WITH TREES AND THE GROUND AFTER THE ENGINE LOST POWER DURING TAKEOFF. THE CFI NOTED THE RPM DROPPING TO 2000 WITH FULL THROTTLE AND AT ABOUT 75 AGL AND TRIED TO ARREST THE DESCENT WITH FLAPS BUT WAS UNSUCCESSFUL. ONE TAKEOFF HAD BEEN ABORTED DUE TO POOR ACCELERATION BUT THE CFI HAD THOUGHT IT WAS IMPROPER THROTTLE TECHNIQUE ON THE PARTOF THE STUDENT. POST ACCIDENT ENGINE EXAMINATION REVEALED OLD TYPE VALVE SPRINGS INSTALLED THAT SHOULD HAVE BEEN REPLACED BY PN LW11800. A MECHANIC HAD INSTALLED NEW SPRINGS BUT OF AN INCORRECT TYPE WITH INCORRECT COLOR CODING. AVCO LYCOMING SERVICE INSTRUCTION 1240B CALLED FOR THE CHANGE TO IMPROVE ENGINE PERFORMANCE WITH THE RECOMMENDED IMPROVED VALVE SPRINGS.