# NTSB FTW86LA166: Mooney M20E, N1250X, Oklahoma City, OK, September 13, 1986

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: September 13, 1986, 09:09 local (14:09 UTC)
- Place: Oklahoma City, OK
- Coordinates: 35.359367, -97.370147 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.3594&lon=-97.3701&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 4 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 22090
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW86LA166
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22090/pdf
- Page: https://openairdocs.org/ntsb/FTW86LA166

## 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, climb - to cruise
  - engine assembly - failure,total (cause)
  - fluid,oil - exhaustion (cause)
  - aircraft preflight - inadequate, pilot in command (cause)
- Forced landing, descent - emergency
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - rough/uneven (contributing factor)
- Nose gear collapsed, landing - roll

## Analysis

THE PILOT APPARENTLY HAD NEGLECTED TO CHECK HIS ENGINE OIL SUPPLY BEFORE TAKEOFF SINCE THERE WAS NO OIL IN THE CRANKCASE AT THE TIME OF THE ACCIDENT. IF FIVE QUARTS OF OIL (THE AMOUNT THE PILOT REPORTEDLY STATED WAS IN THE ENGINE AT TAKEOFF) HAD LEAKED OUT DURING A FIVE MINUTE FLIGHT, THEN THE BOTTOM OF THE FUSELAGE AND THE EMPENNAGE ASSEMBLY WOULD HAVE BEEN COATED WITH OIL. EXAMINATION OF THE AIRCRAFT AT THE ACCIDENT SITE SHOWED NO SIGNS OF AN OIL LEAK. THE FORCED LANDING WAS MADE ON ROUGH AND UNEVEN TERRAIN. AFTER TOUCHDOWN THE NOSE GEAR CONTACTED A DIRT BANK AND COLLAPSED.

## Aircraft

- Registration: [N1250X](https://openairdocs.org/deregistered/N1250X-2014-09-03), registration cancelled 2014-09-03, S/N 123, built 1963 (OpenAirDocs)
- Reported make and model: MOONEY M20E
- Registry model: [Mooney M20E](https://openairdocs.org/model/mooney-m20e) (registry code 5870212) (OpenAirDocs)
- Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 125
- Airframe hours: 2667
- Engines: LYCOMING IO-360-A1A 180 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: John S. Schoernberg
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, April 5, 1986, 49 hours before
- Departed: 2DT, OKLAHOMA CITY, OK
- Destination: OF7, EUFAULA, OK

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 59; private; airplane ratings: multi-engine land, single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 567 total

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 75 °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 19860913044819A](https://openairdocs.org/incident/19860913044819A), Sep 13, 1986: Mooney M20E, Oklahoma City, OK, Substantial damage. Engine lost oil pressure in flight. Pilot made an emergency landing. No oil leaks found during engine tear down.

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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