# NTSB MKC83LA211: Mooney M20C, N4057N, Bloomfield, IA, September 4, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 4, 1983, 12:20 local (17:20 UTC)
- Place: Bloomfield, IA
- Coordinates: 40.740444, -92.409103 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.7404&lon=-92.4091&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33483
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC83LA211
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33483/pdf
- Page: https://openairdocs.org/ntsb/MKC83LA211

## 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,push rod - bent (cause)
  - engine assembly,other - failure,total (cause)
- Forced landing, landing - flare/touchdown
- In flight collision with object, landing - flare/touchdown
  - terrain condition - high obstruction(s) (contributing factor)
  - object - fence (contributing factor)

## Analysis

WHILE EN ROUTE, THE PLT ENCOUNTERED A PROGRESSIVE, PARTIAL POWER LOSS. AT 1ST THE ENG BEGAN RUNNING ROUGH, THEN THE MANIFOLD PRESSURE DROPPED TO 15 INCHES (18 INCHES HAD BEEN SET FOR CRUISE). HE HEARD A CLICKING NOISE & STARTED A DESCENT FROM HIS CRUISE ALT OF 8500 FT. HE BEGAN A PRECAUTIONARY LANDING. WHEN HE SAW THAT THE WIND WOULD CARRY THE ACFT BEYOND THE FIELD HE HAD SELECTED, HE USED WHAT AVAILABLE POWER HE HAD TO CROSS OVER A ROAD & A POND, AND TO AVOID A TRANSMISSION LINE. HOWEVER, HE WAS UNABLE TO AVOID A FENCE. THE PLT STATED THAT THE ACFT TORE THRU A FENCE, JUST BEFORE TOUCHDOWN. AN INVESTIGATION REVEALED THAT THE #4 EXHAUST PUSHROD WAS BENT & THE HOUSING WAS BROKEN.

## Aircraft

- Registration: [N4057N](https://openairdocs.org/aircraft/N4057N), registered now, S/N 680027, built 1968 (OpenAirDocs)
- Reported make and model: MOONEY M20C
- Registry model: [Mooney M20C](https://openairdocs.org/model/mooney-m20c) (registry code 5870208) (OpenAirDocs)
- Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 680027
- Airframe hours: 2326
- Engines: LYCOMING O-360-A1D 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Aero West Flying Club
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, May 24, 1983, 567 hours before
- Departed: DVN, DAVENPORT, IA
- Destination: 3AU, AGUSTA, KS
- Flight plan: VFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; commercial, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 926 total, 77 in this make and model, 826 as pilot in command, 415 in the last 90 days, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 12 knots
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 88 °F, dew point 61 °F
- Altimeter: 29.00 inHg
- Observed at: OTM

## 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 19830904046099A](https://openairdocs.org/incident/19830904046099A), Sep 4, 1983: Mooney M20C, Bloomfield, IA, Substantial damage. Engine vibrated and lost power. Ran into a fence landing downwind. Nr 4 push rod bent and housing broken.

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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