# NTSB CHI84FA354: Cessna 150A, N7250X, Twin Lake, MI, August 23, 1984

- Type: NTSB accident investigation
- Classification: Accident · Fatal · Field investigation · Final report
- Date: August 22, 1984, 20:30 local (Aug 23, 1984, 00:30 UTC)
- Place: Twin Lake, MI
- Coordinates: 43.360073, -86.169448 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.3601&lon=-86.1694&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Fatal
- Injuries: 3 fatal
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12423
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI84FA354
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12423/pdf
- Page: https://openairdocs.org/ntsb/CHI84FA354

## Sequence of events

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

- Loss of control - in flight, maneuvering
  - maneuver - not corrected, pilot in command (cause)
  - clearance - not maintained, pilot in command (cause)
  - proper descent rate - not followed, pilot in command (cause)
  - physical impairment(other cardiovascular), pilot in command
  - physical impairment(organic problem), pilot in command
  - incapacitation(loss of consciousness), pilot in command
- In flight collision with terrain/water, descent - uncontrolled
  - object - tree(s)

## Analysis

THE ACFT COLLIDED WITH THE GROUND IN A SPIRAL LIKE DESCENT WITH THE ENG IN A POWER RETARDED STATE AS EVIDENCED BY THE SOUND EFFECTS. THE WAS NO MISSING OR BACKFIRING OF THE POWER PLANT. THE ACFT STRUCK THE GROUND VERTICALLY AFTER BEING SEEN IN A NOSE DWN VERTICAL DESCENT WHILE SPRIRALING. THE PLT HAD BEEN DISQUALIFIED BY THE FAA FOR MEDICAL REASONS. HE WAS TAKING DILANTIN FOR PREVENTION OF SEIZURES, WHICH IS A DISQUALIFYING MEDICATION FOR A FLT PHYSICAL. NOTHING OF A MECHANICL NATURE WAS FOUND WHICH WAS CAUSAL TO THE ACCIDENT PROFILE DURING THE POST ACCIDENT INVESTIGATION. THE AUTOPSY REVEALED MODERATE ARTERLOSCLEROTIC HEART DISEASE WITH CORONARY ARTERIOSCLEROSIS. THE PLT WAS 54 YEARS OLD.

## Aircraft

- Registration: [N7250X](https://openairdocs.org/deregistered/N7250X-2014-12-22), registration cancelled 2014-12-22, S/N 15059350, built 1961 (OpenAirDocs)
- Reported make and model: CESSNA 150A
- Registry model: [Cessna 150A](https://openairdocs.org/model/cessna-150a) (registry code 2071804) (OpenAirDocs)
- Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 15059350
- Airframe hours: 12
- Engines: CONTINENTAL O-200-A 100 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Richard A. Pumfrey
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, May 4, 1984, 12 hours before
- Departed: 31C, MUSKEGON, MI

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 54; private; airplane ratings: single-engine land; seat: left; toxicology performed; flight hours: 700 total, 700 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 330° at 10 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 70 °F, dew point 61 °F
- Altimeter: 29.00 inHg
- Observed at: MKG, 11 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 19840822046499A](https://openairdocs.org/incident/19840822046499A), Aug 22, 1984: Cessna 150A, Twin Lake, MI, Destroyed, 1 fatal. Aircraft seen diving and spiraling to ground. Pilot had been denied medical due to medication and seizures.

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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