# NTSB CHI91DTG03: Schweizer G164, N48687, Gwinner, ND, June 16, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 16, 1991, 05:45 local (10:45 UTC)
- Place: Gwinner, ND
- Coordinates: 46.219615, -97.650917 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=46.2196&lon=-97.6509&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report February 8, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 14872
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91DTG03
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14872/pdf
- Page: https://openairdocs.org/ntsb/CHI91DTG03

## Probable cause

INADVERTENT CLOSING OF THE MIXTURE BY THE PILOT.  FACTORS RELATED TO THE ACCIDENT ARE INADEQUATE CONTROL SHAPE, OR SIZE, AND INATTENTIVENESS OF THE PILOT.

## Sequence of events

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

- Loss of engine power(total) - nonmechanical, takeoff - initial climb
  - mixture - improper use of, pilot in command (cause)
  - acft/equip,inadequate control shape/size, manufacturer (contributing factor)
  - inattentive, pilot in command (contributing factor)
- Hard landing, descent - emergency
- Nose over, landing

## Analysis

THE PILOT WAS CLIMBING OUT AFTER TAKEOFF FOR AN AGRICULTURAL OPERATION. AT 250 FEET AGL HE REDUCED POWER AND RPM, AND STARTED A TURN.  THE PILOT THEN REALIZED THAT THE RPM WAS DROPPING AND HE HAD NO POWER.  A HARD LANDING WHICH RESULTED IN A NOSE OVER WAS MADE IN A FARMER'S FIELD.  THE PROPELLER CONTROL AND THE MIXTURE ARE IN CLOSE PROXIMITY TO EACH OTHER, AND ARE THE SAME SHAPE AND SIZE IN THIS MODEL AIRCRAFT.

## Aircraft

- Registration: [N48687](https://openairdocs.org/deregistered/N48687-2016-11-03), registration cancelled 2016-11-03, S/N 157B, built 1976 (OpenAirDocs)
- Reported make and model: SCHWEIZER G164
- 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: 157B
- Airframe hours: 4148
- Engines: P&W 1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Fire: On-Ground
- Flight: Aerial application, Part 137
- Operator: Hoistad Flying Service, Inc.
- Registered owner: Hoistad Flying Service, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, December 18, 1990, 140 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 2,400 total, 140 in this make and model, 2,400 as pilot in command, 140 in the last 90 days, 100 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Dawn
- Wind: 210° at 1 knots, gusting 2
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 57 °F, dew point 50 °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 19910616027729A](https://openairdocs.org/incident/19910616027729A), Jun 16, 1991: Scwzer G164B, Gwinner, ND, Substantial damage. Reported power loss on takeoff. Impact with ground tore off engine. Flipped over. No defects. Same knobs prop power

## Other investigations on N48687 (3)

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.

- [NTSB CEN15LA271](https://openairdocs.org/ntsb/CEN15LA271), Jun 12, 2015: Grumman Acft ENG Cor-Schweizer G 164B (N48687), Foster, NE, substantial damage. Probable cause: The total loss of engine power during a low-level aerial application flight due to fuel exhaustion following the pilot’s inadequate preflight inspection that led to his assumption that sufficient…
- [NTSB CHI92DTG04](https://openairdocs.org/ntsb/CHI92DTG04), Aug 14, 1992: Grumman G-164B (N48687), Grandin, ND, substantial damage. Probable cause: THE CRACKED CYLINDER WHICH RESULTED IN A FORCED LANDING. THE LACK OF SUITABLE TERRAIN ON WHICH TO MAKE AN EMERGENCY LANDING WAS A FACTOR.
- [NTSB FTW83LA405](https://openairdocs.org/ntsb/FTW83LA405), Aug 31, 1983: Grumman G-164B (N48687), East Bernard, TX, substantial damage

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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