- Date
- June 10, 1993, 19:20 local (Jun 11, 1993, 01:20 UTC)
- Place
- Livermore, CO
- Injuries
- 2 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N4829ECessna 172N
- Weather
- Visual (VMC) · Dusk
- Status
- Completed · report November 19, 1993
- Report
- Approved by Office Director
- FAA report
- 19930610022869A
- Case key
- 18295
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
A partial power loss when the rocker box for one cylinder disengaged. A factor was: unsuitable terrain for a forced landing.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
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.
Aircraft
- Registration
- N4829E
- Reported as
- Cessna 172N
- Category
- Airplane
- Serial number
- 17271668
- Airframe hours
- 3,925
- Engine
- Lycoming O-320-H2AD, 160 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Personal · Part 91
- Operator
- Northern Colorado Air Charter, doing business as Ncac
- Registered owner
- Northern Colorado Air Charter
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · May 5, 1993 · 60 hours before
- Departed
- 3V5 · Ft.Collins, CO
- Destination
- 3V5
- Flight plan
- VFR
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 39
- Certificates
- Military, Private, Commercial
- Airplane ratings
- Single-engine land
- Instrument ratings
- Helicopter
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Seat
- Left
- Flight hours
- 1,645 total · 23 in this make and model · 24 in the last 90 days · 4 in the last 30 days · 1 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Dusk
- Wind
- 110° at 8 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 73 °F, dew point 37 °F
- Altimeter
- 30.00 inHg
- Observed at
- FNL, 20 nm away
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N4829E · 1
Matched to the same aircraft by N-number and date.