NTSB Identification: NYC88FA147.
The docket is stored on NTSB microfiche number 38648.
Accident occurred Sunday, May 29, 1988 in SHAFTSBURY, VT
Probable Cause Approval Date: 11/02/1989
Aircraft: LAKE LA4-250, registration: N1405F
Injuries: 1 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 LAKE AMPHIBIAN WAS BEING FLOWN WITH TWO FERRY TANKS INSTALLED IN THE CABIN. THE PILOT DEPARTED WITH FULL FUEL IN THE AIRCRAFT TANKS AND 15 GALLONS IN THE FERRY TANKS. THE CENTER OF GRAVITY AT ZERO FUEL WEIGHT WAS 3/4 INCH PAST THE AFT LIMIT. WITH ADDITION OF FUEL THE POSITION OF THE CG REMAINED UNCHANGED, HOWEVER, THE AFT LIMIT OF THE ENVELOPE MOVED FORWARD WITH HIGHER WEIGHTS. A CONNECTION WHERE THE FERRY TANKS WERE PLUMBED INTO THE AIRCRAFT SYSTEM LEAKED AND ALLOWED AIR TO BE SUCKED INTO THE SYSTEM. WITNESSES REPORTED THE ENGINE INTERMITTENT, THEN THE AIRCRAFT ENTERED A SPIN FROM WHICH IT DID NOT RECOVER.

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

FUEL SYSTEM,LINE FITTING..LOOSE

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

FLUID,FUEL..STARVATION

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

STALL/SPIN..INADVERTENT..PILOT IN COMMAND


Contributing Factors

PREFLIGHT PLANNING/PREPARATION..POOR..PILOT IN COMMAND


Contributing Factors

AIRCRAFT WEIGHT AND BALANCE..IMPROPER..PILOT IN COMMAND

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