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NTSB Report
April 29, 1983 · Beech 77 · N67140
Renton, WA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 29, 1983
Injury Outcomes
2 injuries (2 fatalities)
Location
Renton, WA
Aircraft
Beech 77
Tail Number
N67140
Operator
Fancher Flyways
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
SEA83FA093
THE ACFT WAS TAKING OFF FOR A 1 HOUR ENGINE RUN-IN FOLLOWING A TOP OVERHAUL. AFTER LIFTOFF THE ENGINE BEGAN A GRADUAL POWER LOSS AND ROUGH RUNNING. THE PILOT WAS TRYING TURNING BACK TO THE RUNWAY TO LAND WHEN TOTAL POWER LOSS OCCURRED. THE ACFT HAD TURNED 45 DEGREES WHEN THE NOSE FELL THROUGH, THE WINGS ROTATED 180 DEGREES TO THE LEFT AND THE ACFT IMPACTED NOSE FIRST ON THE RUNWAY. THE MECHANIC WHO PERFORMED THE REMOVAL AND REINSTALLATION OF THE CYLINDERS FOR THE TOP OVERHAUL WAS OCCUPYING THE LEFT SEAT. THE MAINTENANCE SUPERVISOR WAS THE PILOT-IN-COMMAND IN THE RIGHT SEAT. THE LOCKING NUT ON THE #1 CYLINDER EXHAUST VALVE ADJUSTING SCREW WAS FOUND LOOSE AND THE ADJUSTING SCREW HAD BACKED OUT OF THE ROCKER ARM BY PUSHROD ACTION DURING TAKEOFF, NEGATING ROCKER ARM ACTION AND EXHAUST VALVE OPENING. THE LOCKING NUTS FOR ALL OF THE OTHER VALVE ADJUSTING SCREWS WERE FOUND PROPERLY TORQUED.
Full Narrative
THE ACFT WAS TAKING OFF FOR A 1 HOUR ENGINE RUN-IN FOLLOWING A TOP OVERHAUL. AFTER LIFTOFF THE ENGINE BEGAN A GRADUAL POWER LOSS AND ROUGH RUNNING. THE PILOT WAS TRYING TURNING BACK TO THE RUNWAY TO LAND WHEN TOTAL POWER LOSS OCCURRED. THE ACFT HAD TURNED 45 DEGREES WHEN THE NOSE FELL THROUGH, THE WINGS ROTATED 180 DEGREES TO THE LEFT AND THE ACFT IMPACTED NOSE FIRST ON THE RUNWAY. THE MECHANIC WHO PERFORMED THE REMOVAL AND REINSTALLATION OF THE CYLINDERS FOR THE TOP OVERHAUL WAS OCCUPYING THE LEFT SEAT. THE MAINTENANCE SUPERVISOR WAS THE PILOT-IN-COMMAND IN THE RIGHT SEAT. THE LOCKING NUT ON THE #1 CYLINDER EXHAUST VALVE ADJUSTING SCREW WAS FOUND LOOSE AND THE ADJUSTING SCREW HAD BACKED OUT OF THE ROCKER ARM BY PUSHROD ACTION DURING TAKEOFF, NEGATING ROCKER ARM ACTION AND EXHAUST VALVE OPENING. THE LOCKING NUTS FOR ALL OF THE OTHER VALVE ADJUSTING SCREWS WERE FOUND PROPERLY TORQUED.
Flight
Event TypeAccident
Event Time14:05 PDT
Nearest AirportRENTON (0nm N)
Runway15
Runway Length5379 ft
Runway Width200 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech 77
Tail NumberN67140
Aircraft CategoryAir
DamageDestroyed
OperatorFancher Flyways
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-235-L2C · Reciprocating · 115
Seats2
People & Injuries
Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 26 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind150° @ 10 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point64 F / 52
Altimeter29.00 inHg
Observation Time21:00
Weather SourceWFAC