NTSB Identification: LAX82FA111
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Accident occurred Thursday, March 18, 1982 in SUNFLOWER, AZ
Probable Cause Approval Date: 03/18/1983
Aircraft: CESSNA 401, registration: N499W
Injuries: 5 Fatal,2 Serious.

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.

AT 1027 THE PLT RECEIVED A WX BRIEFING FOR HOLBROOK, AZ. THE PLT WAS TOLD OF FORECASTS FOR "AT LEAST MODERATE ICING IN CLOUDS OR IN PRECIPITATION ABOVE THE FREEZING LEVEL" & THE BRIEFER STATED "I GUARANTEE YOU MODERATE TO SEVERE TURBULENCE..." FOR A ROUTE INTO HOLBROOK. THE PLT LATER GOT WX INFO FOR AMARILLO, TX & FILED AN IFR FLT PLAN TO AMARILLO. THE ACFT DEPARTED AT 1150. AT 1204 THE PLT REPORTED HE HAD AN ENG PROBLEM. RADAR PLOTS INDICATE THE ACFT WAS MAINTAINING A CLIMB OF ABOUT 500 FPM UP TO 11,200 FT. THIRTY SECONDS LATER THE ACFT HAD DESCENDED TO 8,500 FT. RADIO & CONTACT WAS LOST ABOUT 1207. BASED ON A WX STUDY THE PROBABLE METEOROLOGICAL CONDITIONS THAT EXISTED ABOUT THE TIME & IN THE AREA OF THE ACCIDENT WERE MODERATE TO SEVERE TURBULENCE BELOW 12,000 FT MSL & WHILE IN THE CLOUDS ABOVE FREEZING LEVEL THE ACFT LIKELY ENCOUNTERED MODERATE TO SEVERE RIME ICING. THE ACFT WAS NOT CERTIFICATED FOR FLT INTO KNOWN ICING CONDITIONS. THE FLT WAS TRANSPORTING PRISONERS FOR VARIOUS GOVERNMENT AGENCIES.

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

FLIGHT INTO KNOWN ADVERSE WEATHER..INITIATED..PILOT IN COMMAND

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

OPERATION WITH KNOWN DEFICIENCIES IN EQUIPMENT..ATTEMPTED..PILOT IN COMMAND

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

WING..ICE


Contributing Factors

WEATHER CONDITION..RAIN


Contributing Factors

WEATHER CONDITION..TURBULENCE IN CLOUDS


Contributing Factors

WEATHER CONDITION..ICING CONDITIONS

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