NTSB Identification: NYC87FA160.
The docket is stored on NTSB microfiche number 34240.
Accident occurred Wednesday, June 03, 1987 in SO. WINDSOR, CT
Probable Cause Approval Date: 08/01/1988
Aircraft: ROBINSON R22 MARINER, registration: N2287L
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 STUDENT & FLT INSTRUCTOR (CFI) TOOK OFF ON A TRAINING FLT IN A ROBINSON R22 MARINER (FLOAT EQUIPPED) HELICOPTER. DRG THE RETURN FLT FM A PRACTICE AREA, THE HELICOPTER CRASHED. BFR THE ACDNT, 2 WITNESSES HEARD THE HELICOPTER, BUT DID NOT SEE IT UNTIL AFTER THEY HEARD AN UNUSUAL NOISE. ONE WITNESS SAID HE 'HEARD A LOUD PING, LIKE METAL AGAINST METAL.' AT ABOUT THAT TIME, BOTH WITNESSES NOTED AN INTERUPTION IN ENG PWR & SAW PIECES COMING OFF THE HELICOPTER AS IT FELL TO THE GND. IT CRASHED IN AN INVERTED ATTITUDE & BURNED. AN EXAM OF THE WRECKAGE REVEALED THE MAIN ROTOR BLADES HAD STRUCK THE TAIL BOOM & THE ENTIRE TAIL ASSEMBLY (INCLUDING STABILIZERS, TAIL ROTOR GEAR BOX & TAIL ROTOR) HAD SEPD. THE TAIL ASSEMBLY FELL TO THE GND APRX 250' FM THE MAIN WRECKAGE. NO PRE-EXISTING MECH PROBLEMS OR SEVERE MAST BUMPING WERE EVIDENT. THE CFI HAD 451 HRS OF FLT TIME, ALL IN R22 HELICOPTERS. IN THE PREV 5 DAYS, HE HAD FLOWN 2 HRS IN FLOAT EQUIPPED (MARINER) R22'S & HAD MADE WATER LANDINGS, BUT NO INSTRUCTION IN THE MARINER OR ITS DIFFERENCES WAS VERIFIED.

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

A LOSS OF CONTROL IN FLIGHT FOR UNDETERMINED REASONS.

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