ASN Wikibase Occurrence # 37585
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| Date: | Sunday 17 March 1996 |
| Time: | 13:37 LT |
| Type: |  Cessna U206G Stationair 6 |
| Owner/operator: | Key West Seaplane Service |
| Registration: | N9983Z |
| MSN: | U20606794 |
| Year of manufacture: | 1984 |
| Total airframe hrs: | 8443 hours |
| Engine model: | Continental IO-520-F |
| Fatalities: | Fatalities: 5 / Occupants: 6 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Stock Island Sea Plane Base, Key West, FL -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | |
| Dry Tortugas, FL (DTF | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After takeoff, according to radar data, the airplane climbed to 200 feet, then descended to 100 feet. The pilot was advised to turn right to pass behind the approach corridor for a departing airplane. Witnesses observed the airplane flying towards buildings, and stated that the airplane, which was about 50-100 feet above the water, started banking to the right which increased to near a 90-degree angle of bank. The airplane then pitched nose down and impacted the water nose and right wing low, rolled inverted and sank in about 6 feet of water about 20 yards from a seawall. Examination and testing of the right magneto revealed that the point gap was 0.018 inch, which is greater than specified by the manufacturer, and the magneto fired intermittently throughout the entire rpm range. After adjusting the point gap to within limits, the right magneto operated normally. The engine was then run with replacement magnetos installed with their point gaps set as found on the accident magnetos. During the right magneto check, the rpm drop was 156 rpm greater than the left magneto check. Damage was also noted to the #1 cylinder top ignition lead. Examination of the aft bottom section of the right float revealed numerous damaged rivets which join the keel to the bottom skin panel near the aft bulkhead.
Probable Cause: The pilot's improper decision to continue the flight rather than making an immediate water landing due to the low altitude of the airplane and obstructions ahead, which led to his intentional maneuver to avoid the obstructions and subsequent inadvertent stall and loss of control. Contributing to the accident were: an inadequate 100-hour inspection of the airplane by company maintenance personnel for failure to fix a damaged ignition lead and a partially separated keel on one of the floats, the pilot's inadequate preflight of the airplane for his failure to pump a float to remove water, and the pilot's intentional operation of the airplane with an excessive magneto drop.
Accident investigation:
 |
|
Sources:
NTSB MIA96FA100
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=9983Z
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 13-Jul-2016 16:40 | Dr.John Smith | Updated [Location, Nature, Departure airport, Source, Narrative] |
| 05-Nov-2016 21:34 | Dr.John Smith | Updated [Time, Cn, Source] |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 11-Oct-2017 16:07 | TB | Updated [Aircraft type, Location] |
| 09-Apr-2024 07:50 | ASN Update Bot | Updated [Time, Cn, Other fatalities, Phase, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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