# NTSB CHI92LA146: Cessna 150F, N8081S, Eldon, MO, May 8, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 8, 1992, 16:00 local (21:00 UTC)
- Place: Eldon, MO
- Coordinates: 38.350784, -92.570426 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.3508&lon=-92.5704&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report August 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15441
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI92LA146
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15441/pdf
- Page: https://openairdocs.org/ntsb/CHI92LA146

## Probable cause

A BINDING EXHAUST VALVE RESULTING IN A PARTIAL LOSS OF ENGINE POWER. FACTORS IN THE ACCIDENT ARE RISING TERRAIN CONDITIONS, INADEQUATE AIRCRAFT CLIMB CAPABILITY, AND A DITCH IN THE FORCED LANDING AREA.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Loss of engine power(partial) - mech failure/malf, cruise - normal
  - engine assembly,valve,exhaust - binding(mechanical) (cause)
- In flight collision with object, maneuvering - turn to landing area (emergency)
  - object - wire,transmission
  - climb - not possible, pilot in command
  - terrain condition - rising (contributing factor)
  - aircraft performance,climb capability - inadequate (contributing factor)
- Forced landing, descent - emergency
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - ditch (contributing factor)

## Analysis

THE ACCIDENT AIRPLANE LOST PARTIAL ENGINE POWER WHEN THE EXHAUST VALVE IN THE NUMBER ONE CYLINDER BECAME STUCK.  THE PILOT STARTED AN EMERGENCY DESCENT TOWARD A FORCED LANDING AREA AND ATTEMPTED TO TROUBLESHOOT THE ENGINE PROBLEM.  HE REGAINED LEVEL FLIGHT OVER A VALLEY FLOOR BUT BELOW THE ELEVATION OF THE SURROUNDING TERRAIN.  ENGINE OPERATION AT FULL THROTTLE RESULTED IN LESS THAN FULL POWER OUTPUT.  WHEN HE ATTEMPTED TO CLIMB OUT OF THE VALLEY HE WAS UNABLE TO MAINTAIN CLEARANCE FROM OBSTRUCTIONS AND TERRAIN.  HE FLEW THROUGH AND BROKE A POWER TRANSMISSION LINE.  HE FLEW TOWARD LOWER TERRAIN AND LANDED IN AN OPEN FIELD.  HE COLLIDED WITH A DITCH DURING THE FORCED LANDING GROUND ROLL.

## Aircraft

- Registration: [N8081S](https://openairdocs.org/deregistered/N8081S-1994-01-25), registration cancelled 1994-01-25, S/N 15061681 (OpenAirDocs)
- Reported make and model: CESSNA 150F
- Registry model: [Cessna 150F](https://openairdocs.org/model/cessna-150f) (registry code 2071814) (OpenAirDocs)
- Category: Airplane
- Serial number: 15061681
- Airframe hours: 6315
- Engines: CONTINENTAL O-200-A 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Clyde Ditto
- Registered owner: Clyde Ditto
- Airworthiness certificate: Standard, Utility; Standard, Normal
- Last inspection: Annual, January 11, 1992, 55 hours before
- Departed: VER, BOONVILLE, MO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 81 total, 81 in this make and model, 54 as pilot in command, 27 in the last 90 days, 9 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 5 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 36 °F
- Altimeter: 29.00 inHg
- Observed at: JEF, 40 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 (OpenAirDocs).

- [Accident 19920508014049A](https://openairdocs.org/incident/19920508014049A), May 8, 1992: Cessna 150F, Eldon, MO, Substantial damage. Lost power,unable to climb out of valley. Hit powerline. Nosed over in ditch landing. NR1 valve stuck. Others weak.

## Other investigations on N8081S (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB SEA67D0229](https://openairdocs.org/ntsb/SEA67D0229), Jan 24, 1967: Cessna 150 (N8081S), Seattle, WA, substantial damage
- [NTSB SEA66F0184](https://openairdocs.org/ntsb/SEA66F0184), Nov 28, 1965: Cessna 150 (N8081S), Renton, WA, substantial damage

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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