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NTSB Report
April 2, 1986 · Cessna 172 · N80751
Ava, MO
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 2, 1986
Injury Outcomes
No injuries (3 uninjured)
Location
Ava, MO
Aircraft
Cessna 172
Tail Number
N80751
Operator
School of the Ozarks
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MKC86LA078
THE PLT REPORTS THAT THE ENG BEGAN TO RUN ROUGH AND LOSE RPM WHILE THE ACFT WAS CRUISING AT 2500 FT. HE SAID HE ATTEMPTED EMERG PROC BUT THE LOSS OF RPM CONTINUED AND HE DECIDED ON AN OFF-ARPT LANDING. DURING THE APCH TO THE LANDING AREA THE ENG RPM DROPPED TO 1200 AND THE PLT SECURED THE ENG. DURING THE FORCED LANDING THE ACFT HIT A SMALL TREE AND A FENCE POST. EXAM OF THE ENG REVEALED A BROKEN EXHAUST VALVE IN THE #1 CYL. METALLURGICAL EXAM OF THE BROKEN VALVE REVEALED EVIDENCE OF A PROGRESSIVE FAILURE.
Full Narrative
THE PLT REPORTS THAT THE ENG BEGAN TO RUN ROUGH AND LOSE RPM WHILE THE ACFT WAS CRUISING AT 2500 FT. HE SAID HE ATTEMPTED EMERG PROC BUT THE LOSS OF RPM CONTINUED AND HE DECIDED ON AN OFF-ARPT LANDING. DURING THE APCH TO THE LANDING AREA THE ENG RPM DROPPED TO 1200 AND THE PLT SECURED THE ENG. DURING THE FORCED LANDING THE ACFT HIT A SMALL TREE AND A FENCE POST. EXAM OF THE ENG REVEALED A BROKEN EXHAUST VALVE IN THE #1 CYL. METALLURGICAL EXAM OF THE BROKEN VALVE REVEALED EVIDENCE OF A PROGRESSIVE FAILURE.
Flight
Event TypeAccident
Event Time17:25 CST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172
Tail NumberN80751
Aircraft CategoryAir
DamageSubstantial
OperatorSchool of the Ozarks
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-E2D · Reciprocating · 150
Seats4
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 18 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind180° @ 10 kt
Visibility15 sm
CeilingBroken clouds 4000 ft
Temperature / Dew Point70 F / 0 C
Altimeter30.00 inHg
Weather SourcePILO