NTSB Identification: NYC91FA099.
The docket is stored on NTSB microfiche number 45224.
Accident occurred Tuesday, April 02, 1991 in NAPLES, NY
Probable Cause Approval Date: 03/02/1993
Aircraft: PIPER PA-32-260, registration: N3667W
Injuries: 2 Fatal.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PILOT MADE A DEPARTURE AND WAS CLEARED TO CLIMB TO 9000 FT. DURING THE LAST PORTION OF THE CLIMB, THE RATE OF CLIMB DECREASED. AFTER REACHING 8000 FT, THE AIRPLANE ENTERED A DESCENT TO 4100 FT, THEN IT CLIMBED TO 5100 FT. THE AIRPLANE THEN ENTERED ANOTHER DESCENT, LEVELED OFF AT 3800 FT AND DISPPEARED FROM RADAR. SUBSEQUENTLY, THE AIRPLANE DESCENDED AND CRASHED IN MOUNTAINOUS TERRAIN. WITNESSES REPORTED THE ENGINE WAS OPERATING AT A HIGH POWER SETTING BEFORE IMPACT. NO PREIMPCT PART FAILURE OR MALFUNCTION WAS FOUND. ICING CONDITIONS WERE PRESENT AND THE PILOT HAD COMMENTED ABOUT ENCOUNTERING ICE ON HIS PREVIOUS FLIGHT (TO ROCHESTER). THERE WERE REPORTS OF MODERATE RIME ICING FROM AN MD-80 AND A BEECH 99.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

FLIGHT BY THE PILOT INTO KNOWN ICING CONDITIONS, WHICH RESULTED IN STRUCTURAL (WING) ICE AND SUBSEQUENT LOSS OF AIRCRAFT CONTROL. THE WEATHER CONDITION WAS A RELATED FACTOR.

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