NTSB Identification: SEA82AA155
14 CFR Part 91: General Aviation
Accident occurred Sunday, September 05, 1982 in 23 MI ENE TOUTL, WA
Probable Cause Approval Date: 09/05/1983
Aircraft: PIPER PA-32-300, registration: N48915
Injuries: 2 Fatal,5 Serious.

WHILE ON A SIGHTSEEING FLT IN THE MT.ST.HELENS NATIONAL VOLCANIC MONUMENT AREA THE ACFT CRASHED ON THE MUD FLATS OF THE NORTH FORK OF THE TOUTLE RIVER IN A RELATIVELY FLAT & OPEN AREA. THERE WERE INDICATIONS OF A MASSIVE OIL LEAK FROM THE ENG AREA IN FLIGHT. ENG EXAMINATION REVEALED A DEMOUNTED NO.3 CYLINDER. HOLD DOWN BOLTS WERE MISSING FROM ONE 1/2 INCH STUD & ONE 1/2 INCH THROUGHBOLT, & FROM TWO 3/8 INCH STUDS. THERE WAS NO EVIDENCE OF TENSILE OVERLOADING OR STRIPPING. ONE HOLD DOWN NUT OF EACH SIZE WAS LOCATED UNATTACHED & CAPTURED IN THE EXTERIOR ENG BAFFLING. THE NO. 3 CONROD CAP WAS MISSING. THE ENG HAD ACCRUED 446 HRS SINCE OVERHAUL & 24 HRS SINCE LAST INSPECTION. THE WRECKAGE WAS FOUND NEAR A LEVEL STRAIGHT ROAD FREE OF SHOULDER OBSTRUCTIONS. A SURVIVING PAX STATED A FORCED LANDING ON A ROAD WOULD BE MADE. A STEEP TURN WAS MADE OVER THE ROAD & THE ACFT "FELL." THE OWNER'S MANUAL STATES THE PLT SHOULD BE AT 1000FT AGL AT THE DOWNWINDPOSITION FOR A NORMAL APPROACH TO A POWER-OFF LANDING. THE STALL WARNING SYSTEM WAS REPORTED INOPERATIVE.

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

ENGINE ASSEMBLY,CYLINDER..IMPROPER

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

ENGINE ASSEMBLY,CYLINDER..LOOSE

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

ENGINE ASSEMBLY,CYLINDER..SEPARATION

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

MAINTENANCE,OVERHAUL..IMPROPER..OTHER MAINTENANCE PERSONNEL

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

DESCENT..MISJUDGED..PILOT IN COMMAND

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

AIRSPEED..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

PLANNED APPROACH..POOR..PILOT IN COMMAND


Contributing Factors

EMERGENCY PROCEDURE..NOT FOLLOWED..PILOT IN COMMAND


Contributing Factors

WARNING SYSTEM(OTHER)..INOPERATIVE

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