NTSB Identification: MIA87LA266.
The docket is stored on NTSB microfiche number 35239.
Accident occurred Wednesday, September 30, 1987 in 50 NW SAN JUAN
Probable Cause Approval Date: 05/16/1989
Aircraft: AERO COMMANDER 720, registration: N4100S
Injuries: 1 Serious,1 Minor.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

FIFTEEN MINUTES AFTER A NORTHWEST DEPARTURE FROM SAN JUAN INTERNATIONAL ARPT THE PLT REPORTED THAT THE FLT WAS RETURNING TO LAND AFTER SECURING THE RT ENG DUE TO REPORTED PROBLEMS. UNABLE TO MAINTAIN ALTITUDE THE ACFT WAS DITCHED APRX 50 MILES NORTHWEST OF THE ARPT. DENSITY ALTITUDE WAS COMPUTED TO BE 1900 FT AT THE ARPT 1 MINUTE AFTER THE DITCHING. ACCORDING TO THE ACFT OPERATING MANUAL, AT THE DESIGNED GROSS WEIGHT WITH A PROPERLY SECURED ENGINE AT THE ABOVE COMPUTED DENSITY ALTITUDE, THE SINGLE ENGINE RATE OF CLIMB WOULD BE 212 FEET PER MINUTE. THE ACFT & LOGBOOKS HAVE NOT BEEN RECOVERED THEREFORE THE CAUSE OF THE REPORTED ENG FAILURE & MAINTENANCE INFORMATION COULD NOT BE DETERMINED & OBTAINED RESPECTIVELY.

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

REASON FOR OCCURRENCE UNDETERMINED

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