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NTSB Report
June 25, 1991 · Cessna 150M · N3674V
Dana Point, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 25, 1991
Injury Outcomes
1 injury (1 minor injury), 1 uninjured
Location
Dana Point, CA
Aircraft
Cessna 150M
Tail Number
N3674V
Operator
Pegasas Flight Center
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX91LA276
WHILE CRUISING NEAR A BEACH THE AIRPLANE'S ENGINE LOST ALL POWER. THE PILOT MADE A FORCED LANDING OFF SHORE. UPON TOUCHING DOWN IN SHALLOW WATER THE AIRPLANE NOSED OVER. THE EXAMINATION OF THE ENGINE REVEALED THAT ITS NO.1 CYLINDER'S EXHAUST VALVE HAD PROBABLY BECOME STUCK IN ITS GUIDE, & ULTIMATELY THE ROCKER ARM BROKE. FURTHER INVESTIGATION REVEALED THAT TWO DAYS BEFORE THE ACCIDENT THE PILOT HAD EXPERIENCED A POWER LOSS & WHEN THE ENGINE WAS EXAMINED THE SAME STUCK VALVE WAS FOUND. THE MECHANIC WHO FREED UP THE VALVE HAD CAUTIONED THE PILOT THAT, ALTHOUGH HE WAS SUCCESSFUL IN FREEING UP THE VALVE, THE ENGINE WAS IN NEED OF AN OVERHAUL & THE VALVE COULD BECOME STUCK, AT ANY TIME, DURING FUTURE FLIGHTS. THE ENGINE HAD BEEN OPERATED FOR ABOUT 1857 HOURS SINCE ITS LAST MAJOR OVERHAUL.
NTSB Probable Cause
THE SEIZURE OF THE NO. 1 CYLINDER'S EXHAUST VALVE IN ITS GUIDE AND THE RELATED FRACTURING OF THE ROCKER ARM; AND THE PILOT'S OPERATION OF THE AIRCRAFT WITH KNOWN DEFICIENCIES.
Full Narrative
WHILE CRUISING NEAR A BEACH THE AIRPLANE'S ENGINE LOST ALL POWER. THE PILOT MADE A FORCED LANDING OFF SHORE. UPON TOUCHING DOWN IN SHALLOW WATER THE AIRPLANE NOSED OVER. THE EXAMINATION OF THE ENGINE REVEALED THAT ITS NO.1 CYLINDER'S EXHAUST VALVE HAD PROBABLY BECOME STUCK IN ITS GUIDE, & ULTIMATELY THE ROCKER ARM BROKE. FURTHER INVESTIGATION REVEALED THAT TWO DAYS BEFORE THE ACCIDENT THE PILOT HAD EXPERIENCED A POWER LOSS & WHEN THE ENGINE WAS EXAMINED THE SAME STUCK VALVE WAS FOUND. THE MECHANIC WHO FREED UP THE VALVE HAD CAUTIONED THE PILOT THAT, ALTHOUGH HE WAS SUCCESSFUL IN FREEING UP THE VALVE, THE ENGINE WAS IN NEED OF AN OVERHAUL & THE VALVE COULD BECOME STUCK, AT ANY TIME, DURING FUTURE FLIGHTS. THE ENGINE HAD BEEN OPERATED FOR ABOUT 1857 HOURS SINCE ITS LAST MAJOR OVERHAUL.
Flight
Event TypeAccident
Event Time11:11 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 150M
Tail NumberN3674V
Aircraft CategoryAir
DamageSubstantial
OperatorPegasas Flight Center
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-200-A · Reciprocating · 100
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury), 1 uninjured
Fatal0
Serious0
Minor1
Uninjured1
Total2
Crew 1Age 19 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind300° @ 10 kt
Visibility20 sm
CeilingNone
Temperature / Dew Point0 C
Altimeter0
Weather SourcePILO