NTSB Identification: CHI95FA121.
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Accident occurred Wednesday, April 12, 1995 in BELLE PLAINE, MN
Probable Cause Approval Date: 09/24/1995
Aircraft: CESSNA P-210N, registration: N4738A
Injuries: 3 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 INSTRUMENT RATED PRIVATE PILOT DECLARED AN EMERGENCY DURING INITIAL CLIMBOUT IN ICING CONDITIONS. NO OTHER TRANSMISSIONS WERE RECEIVED AND THE AIRPLANE WAS LOST FROM ARTCC RADAR AT 7300 FEET MSL. THE LEFT WING AND BOTH HORIZONTAL STABILIZERS SEPARATED IN FLIGHT, EXHIBITING PERMANENT DEFORMATION SUPPORTING POSITIVE OVERLOAD (STABILIZERS DEFLECTED DOWN, MAIN WINGS DEFLECTED UP). ALL THREE EMPENNAGE DEICE BOOTS WERE FOUND TO HAVE NUMEROUS PATCHES, WHICH WOULD NOT HOLD NORMAL SYSTEM PRESSURE. THE SYSTEM REQUIRED THE EMPENNAGE TO HOLD PRESSURE BEFORE IT WOULD CYCLE TO THE MAIN WINGS. REPLACEMENT OF THE BOOTS HAD BEEN RECOMMENDED TO THE OWNERS 3 MONTHS PRIOR. WITNESSES WHO ARRIVED ON SCENE IMMEDIATELY AFTER THE ACCIDENT DESCRIBED ICE ON THE WINGS AND BOOTS.

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

the failure to replace the deteriorated deicing boots, and the failure of the boots to operate when the airplane encountered icing condition. An additional causes were the pilot's failure to maintain adequate airspeed and the excessive pullup performed by the pilot during the uncontrolled descent.

Full narrative available

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