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ASN Wikibase Occurrence # 15776
Last updated: 22 September 2020
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Type:Silhouette image of generic C172 model; specific model in this crash may look slightly different
Cessna 172S
Owner/operator:Kemper Aviation
Registration: N284SP
C/n / msn: 172S8235
Fatalities:Fatalities: 4 / Occupants: 4
Aircraft damage: Substantial
Location:Martin County Ranches -   United States of America
Phase: Unknown
Departure airport:Okeechobee, FL (OBE)
Destination airport:Okeechobee, FL (OBE)
Investigating agency: NTSB
The purpose of the flight was to conduct aerial surveys of bird activity. During a circling pass, at an altitude about 300 feet above ground level (agl), a witness observed the nose of the airplane drop. The airplane then banked to the right with an accompanying increase in engine noise, and descended into the ground. The airplane had flown approximately 1.5 hours since being serviced with fuel on the morning of the accident flight. The airplane was 5 pounds over maximum gross weight based on the measured weight of the contents. Fuel was observed in the surrounding areas of the accident site, and as such, the maximum gross weight was considered higher than the measured value. Impact damage on the nose, wings, and fuselage were consistent with a stall/spin and subsequent collision with terrain. Postaccident examination revealed that the stall warning device was inoperative at the time of the accident. Two pilots who had previously flown the bird surveying missions, reported that they were instructed by the research leader to fly the airplane at altitudes between 200 and 500 feet agl. They further reported that the type of maneuvers and low airspeeds required to perform the missions would often cause the stall warning horn to sound. Aside from the stall warning horn, no other preimpact mechanical malfunctions were identified with the accident airplane.
Probable Cause: The pilot's failure to maintain an adequate airspeed while maneuvering at low altitude. Contributing to the accident was the overweight condition of the airplane and the inoperative stall warning horn.



Revision history:

13-Mar-2008 12:06 harro Added
21-Dec-2016 19:13 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:14 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:16 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
21-Dec-2016 19:20 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
03-Dec-2017 10:23 ASN Update Bot Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative]

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