NTSB Identification: CHI98LA337.
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Accident occurred Thursday, September 10, 1998 in TAPPEN, ND
Probable Cause Approval Date: 05/19/1999
Aircraft: WSK PZL Mielec PZL M18B, registration: N4450M
Injuries: 1 Uninjured.

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

The pilot said that the airplane lifted off normally, but then wanted to set back down. The pilot lowered the flaps to 15-degrees in hopes of keeping the airplane from settling. Lowering flaps did not seem to help. The pilot said that he then went for the dump handle, but could not find it initially. When he did find it, the airplane impacted into a swamp just off the end of the 3,000 foot long airstrip. Examination of the wreckage revealed no anomalies. According to the Takeoff Distance Chart in the PZL M18B Aircraft Flight Manual, an airplane with atomizers and zero flaps extended, weighing 10,700 pounds, at a temperature of 33 degrees Centigrade, and zero headwind, will require a takeoff distance of approximately 3,600 feet.

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

the pilot's improper preflight preparation resulting in the airplane exceeding the available airstrip distance during takeoff. A factor contributing to this accident was the swamp.

Full narrative available

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