NTSB Identification: NYC00FA092.
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Accident occurred Friday, March 17, 2000 in HYANNIS, MA
Probable Cause Approval Date: 04/06/2001
Aircraft: Dassault DA-900, registration: N814M
Injuries: 2 Minor,4 Uninjured.
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.
Prior to departure, the flight crew confirmed that the 'windy, rainy and stormy' weather would move out of New York and proceed northeast up into the Hyannis area. Arriving in the Hyannis Airport area, at night, the crew received the ATIS, which stated that winds were from 040 degrees at 20 knots, gusts to 33 knots. The ILS Runway 15 approach was in use. Braking action was reported poor by a Cessna 402, and all surfaces were covered with a patchy thin layer of snow and ice. The PIC determined that the tailwind component for the ILS Runway 15 approach would have exceeded the airplane's limitations, and requested the ILS Runway 24 approach. The airplane touched down about 2,640 feet beyond the approach end of the 5,425-foot long runway. The airplane impacted the localizer antenna, departed the end of the runway, went through a chain link fence, crossed a two-lane road, struck three vehicles on the road, continued into a parking lot, and impacted concrete barriers and two parked vehicles. Examination of the airplane revealed a takeoff and landing card (TOLD) on the instrument panel. Written on the card was the landing distance calculated as 3,050 feet and a notation of 'BA POOR'. At the time of the accident the runway was covered with a 1/2-inch accumulation of ice and snow. According to the Dassault DA-900 Airplane Flight Manual (AFM) Limitations Section, the maximum allowable tailwind component at landing was 10 knots. According to the DA-900 Performance Manual, the maximum safe crosswind on icy runways was 5 knots. The manual also stated, 'For icy runway conditions, landing distance is 3 times the landing distance on dry runway.' Using the factor of 3 and a 10 knot tailwind, a landing distance was computed to be about 10,800 feet. No factors were published for a 20 knot tailwind.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The flightcrew's inadequate coordination and improper weather evaluation. Also causal was the captain's improper decision to continue the approach to a runway with insufficient length and his failure to obtain the proper touch down point on the runway. Factors in the accident were the tailwind conditions and the ice and snow-covered runway.
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