# NTSB CHI87DEP04: Mooney M20F, N9627M, Greenwood, WI, December 30, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: December 30, 1986, 15:00 local (21:00 UTC)
- Place: Greenwood, WI
- Coordinates: 44.77095, -90.600654 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.7709&lon=-90.6007&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report January 25, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 13575
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI87DEP04
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13575/pdf
- Page: https://openairdocs.org/ntsb/CHI87DEP04

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, descent - normal
  - throttle/power lever,linkage - loose (cause)
  - maintenance,installation - inadequate, other maintenance personnel (cause)
- Forced landing, descent - emergency
- On ground/water collision with object, landing - roll

## Analysis

THE AIRCRAFT LOST ENGINE POWER DURING A DESCENT DUE TO A LOOSE THROTTLE LINKAGE AND THE PILOT WAS FORCED TO MAKE AN EMERGENCY LANDING IN A FIELD. ON LANDING ROLL THE AIRCRAFT STRUCK A REFLECTOR POST WITH THE RIGHT WING.

## Aircraft

- Registration: N9627M (not matched to a registry record)
- Reported make and model: MOONEY M20F
- Category: Airplane
- Serial number: 670204
- Airframe hours: 2000
- Engines: LYCOMING IO-360-A1A 200 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 91
- Registered owner: Terry L. Dorn
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, February 12, 1986, 56 hours before
- Departed: MDZ, MEDFORD, WI
- Airport: V1Q, Neillsville

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 45; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 411 total, 123 in this make and model, 374 as pilot in command, 3 in the last 90 days, 2 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 5 knots
- Visibility: 10 statute miles
- Temperature: 32 °F

## 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 19861230082149A](https://openairdocs.org/incident/19861230082149A), Dec 30, 1986: Mooney M20F, Greenwood, WI, Substantial damage. The engine lost power. The aircraft struck a reflector post during landing. The throttle linkage bolt fell off.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.