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NTSB Report
June 11, 1993 · Cessna 172N · N4829E
Livermore, CO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 11, 1993
Injury Outcomes
No injuries (2 uninjured)
Location
Livermore, CO
Aircraft
Cessna 172N
Tail Number
N4829E
Operator
Northern Colorado Air Charter
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN93LA068
WHILE ON A LOCAL AREA PERSONAL FLIGHT, THE ENGINE RPM DROPPED FROM 2,300 TO 1,400 RPM FOLLOWED BY ENGINE VIBRATION. THE PILOT ELECTED TO LAND ON THE ONLY ROAD IN THE AREA WHICH CONTAINED A 40 DEGREE RIGHT TURN ALONG THE LANDING ROLL PATH. AS THE AIRCRAFT NEGOTIATED THE TURN, THE RIGHT WING STRUCK A FENCE POST AND THE AIRCRAFT SPUN INTO A DITCH. EXAMINATION REVEALED A FAILURE OF THE RIGHT FORWARD CYLINDER VALVE ROCKER BOX EXHAUST STUD WHICH BACKED OUT AND PREVENTED THE INTAKE VALVE FROM WORKING PROPERLY.
NTSB Probable Cause
A PARTIAL POWER LOSS WHEN THE ROCKER BOX FOR ONE CYLINDER DISENGAGED. A FACTOR WAS: UNSUITABLE TERRAIN FOR A FORCED LANDING.
Full Narrative
WHILE ON A LOCAL AREA PERSONAL FLIGHT, THE ENGINE RPM DROPPED FROM 2,300 TO 1,400 RPM FOLLOWED BY ENGINE VIBRATION. THE PILOT ELECTED TO LAND ON THE ONLY ROAD IN THE AREA WHICH CONTAINED A 40 DEGREE RIGHT TURN ALONG THE LANDING ROLL PATH. AS THE AIRCRAFT NEGOTIATED THE TURN, THE RIGHT WING STRUCK A FENCE POST AND THE AIRCRAFT SPUN INTO A DITCH. EXAMINATION REVEALED A FAILURE OF THE RIGHT FORWARD CYLINDER VALVE ROCKER BOX EXHAUST STUD WHICH BACKED OUT AND PREVENTED THE INTAKE VALVE FROM WORKING PROPERLY.
Flight
Event TypeAccident
Event Time19:20 MDT
Nearest Airport0nm N
Runway0
Flight Plan FiledVFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172N
Tail NumberN4829E
Aircraft CategoryAir
DamageSubstantial
OperatorNorthern Colorado Air Charter
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-H2AD · Reciprocating · 160
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 39 · Second Class
Conditions
ConditionsVMC
LightDusk
Wind110° @ 8 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point37 C
Altimeter30.00 inHg
Observation Time01:15
Weather SourceWFAC