# NTSB FTW91DPG17: Grumman G-164, N634U, Goodwin, AR, July 24, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: July 24, 1991, 16:00 local (21:00 UTC)
- Place: Goodwin, AR
- Coordinates: 34.940425, -91.029853 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.9404&lon=-91.0299&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 10, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 23206
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW91DPG17
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/23206/pdf
- Page: https://openairdocs.org/ntsb/FTW91DPG17

## Probable cause

THE FAILURE OF THE RIGHT MAIN LANDING GEAR.

## Sequence of events

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

- Main gear collapsed, landing - flare/touchdown
  - landing gear,main gear spring - failure,total (cause)
- Loss of control - on ground/water, landing - roll

## Analysis

THE RIGHT MAIN LANDING GEAR SPRING FAILED AT THE FUSELAGE ATTACHING POINT DURING A LANDING TO A GRASS STRIP. FOLLOWING THE GEAR FAILURE, THE PILOT LOST CONTROL.

## Aircraft

- Registration: [N634U](https://openairdocs.org/deregistered/N634U-2013-04-29), registration cancelled 2013-04-29, S/N 370, built 1965 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164
- Registry model: [Grumman G-164](https://openairdocs.org/model/grumman-g-164) (registry code 3952702) (OpenAirDocs)
- Registry engine: [Jacobs R755A series](https://openairdocs.org/engine/jacobs-r755a-series) (registry code 35006, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 370
- Airframe hours: 8913
- Engines: P&W R985-AN-1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Gary J. Michaelis
- Registered owner: Gary J. Michaelis
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, February 11, 1991, 417 hours before
- Airport: NONE, Private, runway 9, 2,600 × 50 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 26; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 1,467 total, 1,171 in this make and model, 1,400 as pilot in command, 275 in the last 90 days, 100 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 240° at 3 knots
- Visibility: 7 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 73 °F, dew point 72 °F
- Altimeter: 29.00 inHg

## 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 19910724029889A](https://openairdocs.org/incident/19910724029889A), Jul 24, 1991: Scwzer G164, Goodwin, AR, Substantial damage. Right main landing gear leg broke on touchdown causing ag aircraft to ground loop.

## Other investigations on N634U (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 FTW97FA304](https://openairdocs.org/ntsb/FTW97FA304), Aug 11, 1997: Grumman G-164 (N634U), Wilmot, AR, substantial damage, 1 fatal. Probable cause: The loss of engine power due to a fractured throttle cable because the cable housing prevents an inspection of the cable by maintenance personnel. Factors were the pilot's impairment due to a heart…
- [NTSB FTW93LA101](https://openairdocs.org/ntsb/FTW93LA101), Mar 11, 1993: Grumman G-164 (N634U), Goodwin, AR, substantial damage. Probable cause: THE PILOT'S FAILURE TO COMPENSATE FOR THE CROSSWIND. A FACTOR WAS THE CROSSWIND.
- [NTSB MKC86LA177](https://openairdocs.org/ntsb/MKC86LA177), Aug 22, 1986: Grumman G-164 (N634U), Goodwin, AR, 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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