# NTSB CHI92DCJ05: Grumman-Schweizer G-164B, N48672, Atkinson, NE, August 11, 1992

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: August 11, 1992, 11:00 local (16:00 UTC)
- Place: Atkinson, NE
- Coordinates: 42.529621, -98.970191 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=42.5296&lon=-98.9702&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15223
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI92DCJ05
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15223/pdf
- Page: https://openairdocs.org/ntsb/CHI92DCJ05

## Probable cause

A CRACKED ENGINE CYLINDER.

## 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, climb
  - engine assembly,cylinder - cracked (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, landing - roll

## Analysis

THE PILOT REPORTED THE ENGINE BEGAN TO RUN ROUGH SHORTLY AFTER TAKEOFF. HE STATED HE BELIEVED THE PROBLEM WAS RELATED TO THE IGNITION SYSTEM, AND ATTEMPTED TO 'VERIFY AND ISOLATE THE PROBLEM... .'  WHEN THE MAGNETO SWITCH WAS MOVED FROM THE BOTH TO THE LEFT POSITION, THE ENGINE LOST POWER.  ATTEMPTS AT RESTART WERE UNSUCCESSFUL, AND THE PILOT MADE A FORCED LANDING IN A CORN FIELD.  POST-ACCIDENT EXAMINATION REVEALED A CRACKED CYLINDER INSTALLED AT THE NUMBER 9 POSITION.  THERE WAS NO EVIDENCE OF OTHER PRE-IMPACT MALFUNCTION.

## Aircraft

- Registration: [N48672](https://openairdocs.org/aircraft/N48672), registered now, S/N 108B, built 1976 (OpenAirDocs)
- Reported make and model: Grumman-Schweizer G-164B
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 108B
- Airframe hours: 3941
- Engines: P&W R-985-14B 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Mitchell, Larry D.
- Registered owner: D. Hopkins & G Cornish
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, June 9, 1992, 53 hours before
- Departed: 8V2
- Destination: 8V2
- Airport: 8V2, Stuart Atkinson Municipal, runway 11, 4,040 × 50 ft

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 55; flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 14,000 total, 6,000 in this make and model, 13,000 as pilot in command, 250 in the last 90 days, 60 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 61 °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 19920811031269A](https://openairdocs.org/incident/19920811031269A), Aug 11, 1992: Scwzer G164B, Atkinson, NE, Substantial damage. Engine lost partial power on takeoff. Switched mags. Engine quit. Found NR9 cylinder with cracked head.

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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