NTSB Identification: SEA86FA033.
The docket is stored on NTSB microfiche number 29489.
Accident occurred Sunday, December 29, 1985 in DES MOINES, WA
Aircraft: Mooney M20K, registration: N1152T
Injuries: 4 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 WEATHER BRIEFER INFORMED THE PILOT THAT VFR WAS NOT RECOMMENDED DUE TO CURRENT/FORECAST CONDTIONS. THE NON INSTRUMENT RATED PILOT THEN FILED A VFR FLIGHT PLAN RESPONDING THAT HE WAS IFR RATED AND WOULD FILE INFLIGHT IF NECESSARY. WITNESSES REPORTED OBSERVING THE AIRCRAFT CRUISING NORTHBOUND OVER I-5 AT A MODERATE SPEED AND LOW ALTITUDE BENEATH THE CLOUDS. WEATHER CONDITIONS IN THE VICINITY OF THE ACCIDENT SITE WERE DESCRIBED AS 300 FOOT CEILING AND 1 MILE VISIBILITY. DARK NIGHT CONDITIONS EXISTED WHEN THE AIRCRAFT STRUCK POWER LINE 75 FEET ABOVE THE I-5 MEDIAN AND 6 NAUTICAL MILES SOUTH OF THE DESTINATION AIRPORT. IN SPITE OF DETERIORATING WEATHER CONDITIONS THE PILOT MADE NO ATTEMPT TO DIVERT ALONG HIS ROUTE OF FLIGHT TO A MORE FAVORABLE DESTINATION. AN ENTRY REFERRING TO 'SCUD FLYING' WAS NOTED IN THE PILOT'S LOGBOOK.

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

PREFLIGHT BRIEFING SERVICE..DISREGARDED..PILOT IN COMMAND

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

IN-FLIGHT PLANNING/DECISION..IMPROPER..PILOT IN COMMAND


Contributing Factors

OVERCONFIDENCE IN PERSONAL ABILITY..PILOT IN COMMAND


Contributing Factors

LACK OF RECENT EXPERIENCE..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..LOW CEILING


Contributing Factors

LIGHT CONDITION..DARK NIGHT


Contributing Factors

OBJECT..WIRE,TRANSMISSION

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