NTSB Identification: MIA91MA100.
The docket is stored on NTSB microfiche number 44590.
Accident occurred Sunday, March 17, 1991 in BRONSON, FL
Probable Cause Approval Date: 03/02/1993
Aircraft: PIPER PA-46-310P, registration: N9112K
Injuries: 4 Fatal.

NTSB investigators traveled in support of this investigation and used data obtained from various sources to prepare this aircraft accident report.

THE PLT WAS ON AN IFR FLT IN IMC & RCVD CLNC TO CLIMB & MAINT FL220. DRG CLIMB, HE INFORMED ARTCC, '. . . WE'RE HAVING A PROBLEM.' WHEN ASKED TO SAY AGAIN, HE BGN THE SAME REPLY, THEN NO FURTHER RDO COM WAS RCVD FM THE ACFT. SUBSEQUENTLY AN INFLT BREAKUP OCCURRED & WRECKAGE WAS SCATTERED OVR A WIDE AREA. THE RGT OUTBOARD WING PANEL, HRZNTL STABILIZER, ELEVATORS, RGT AILERON & PARTS OF THE RUDDER WERE FND AT A DSTC FM THE MAIN WRECKAGE. THESE DISPLAYED EVIDENCE OF OVERSTRESS FAILURE. NO PREEXISTING CRACKS OR FATIGUE WAS FND. RADAR & WX DATA SHOWED DEV FM NORMAL FLT BGN AT OR NR MDT CONVECTIVE WX ECHO (VIP 2) AS THE ACFT WAS CLIMBING THRU 17,300' IN FRZG CONDS. AT THAT TIME, THE RATE OF CLIMB WAS ABT 200'/MIN & THE GND SPD WAS 150 TO 160 KTS. AT 1032:18, A DSCNT BGN. DRG THE NEXT 2 TO 3 MIN, THE ACFT'S ALT, HDG & SPD DEVIATED. AT 1035:17, OTR PRIMARY RADAR TARGETS APPEARED, THEN RADAR CTC WAS LOST. GROSS WT OF THE ACFT WAS ESTD TO BE 4311 LBS; MAX ALLOWABLE WT WAS 4100 LBS. CG WAS ESTD TO BE 1.59 INCHES BHND THE AFT LMT. (SEE: NTSB/SIR-92/03)

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

THE PILOT'S FAILURE TO ACTIVATE THE PITOT HEAT BEFORE ASCENDING ABOVE THE FREEZING LEVEL IN INSTRUMENT METEOROLOGICAL CONDITIONS (IMC), FOLLOWED BY HIS IMPROPER RESPONSE TO ERRONEOUS AIRSPEED INDICATIONS THAT RESULTED FROM BLOCKAGE OF THE PITOT TUBE BY ATMOSPHERIC ICING. CONTRIBUTING TO THE ACCIDENT WAS: THE PILOT'S LACK OF CURRENCY IN FLYING IN IMC.

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