# NTSB SEA94LA092: Grumman-Schweizer G-164B, N6754Q, Levan, UT, March 30, 1994

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 30, 1994, 09:00 local (16:00 UTC)
- Place: Levan, UT
- Coordinates: 39.520183, -111.879829 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.5202&lon=-111.8798&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report December 7, 1994
- Report: Approved by Office Director
- NTSB case key (mKey): 41903
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA94LA092
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41903/pdf
- Page: https://openairdocs.org/ntsb/SEA94LA092

## Probable cause

THE LEFT MAIN LANDING GEAR WHEEL BEARING BROKE RESULTING IN THE WHEEL JAMMING AND THE AIRPLANE NOSING OVER.

## Sequence of events

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

- Airframe/component/system failure/malfunction, landing - roll
  - landing gear,wheel - jammed (cause)
- Nose over, landing - roll
  - aircraft control - not possible, pilot in command

## Analysis

DURING LANDING THE LEFT WHEEL OUTER BEARING BROKE AND SEPARATED FROM THE WHEEL AXLE. THIS ALLOWED THE BRAKE CALIPER ASSEMBLY TO JAM AND RESTRICT ROTATION OF THE WHEEL. THE PILOT WAS UNABLE TO MAINTAIN CONTROL OF THE AIRCRAFT AND IT NOSED OVER.

## Factual narrative

On March 30, 1994, approximately 0900 hours mountain standard time (MST), a Grumman-Schweizer G-164B "AgCat", N6754Q, registered to ATR, being operated by Spanish Fork Flying Service, and being flown by Rex Woodhouse, a certificated commercial pilot, nosed over while landing on a road approximately 10 miles south-southwest of Levan, Utah. The aircraft was substantially damaged and the pilot was uninjured. Visual meteorological conditions existed and no flight plan had been filed. The flight, which was engaged in aerial application, was to have been operated in accordance with 14CFR137.

The pilot reported that upon landing he heard a "snap" and the aircraft nosed over. Post crash examination by FAA inspector Jerry E. Roberts revealed that the left main wheel outer bearing (rollers and retainer cups) had broken apart (photograph 01). The outer bearing then separated from the wheel axle. The left brake caliper assembly subsequently released lodging against the left gear strut which restricted rotation of the wheel (photograph 02).

## Aircraft

- Registration: [N6754Q](https://openairdocs.org/aircraft/N6754Q), registered now, S/N 265B, built 1977 (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: 265B
- Airframe hours: 4155
- Engines: P&W R-985-AN14B 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Spanish Fork Flying Service
- Registered owner: Atr
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, July 20, 1993, 35 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 50; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 15,000 total, 6,000 in this make and model, 14,900 as pilot in command, 45 in the last 90 days, 40 in the last 30 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 41 °F, dew point 14 °F
- Observed at: U24, 23 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 19940330007249A](https://openairdocs.org/incident/19940330007249A), Mar 30, 1994: Scwzer G164B, Levan, UT, Substantial damage. Nosed over landing on a road. Left wheel bearing broke and separated from axle. Brake caliper jammed wheel.

## Other investigations on N6754Q (2)

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 CEN13LA322](https://openairdocs.org/ntsb/CEN13LA322), Jun 6, 2013: Grumman Acft ENG Cor-Schweizer G-164B (N6754Q), Covington, OK, substantial damage. Probable cause: The airplane’s failure to climb after takeoff for reasons that could not be determined because postaccident examinations of the engine and airframe did not reveal any anomalies that would have…
- [NTSB DEN89LA160](https://openairdocs.org/ntsb/DEN89LA160), Jul 8, 1989: Grumman-Schweizer G-164B (N6754Q), Holden, UT, substantial damage. Probable cause: THE PILOT'S MISJUDGEMENT OF THE EFFECT OF HIGH DENSITY ALTITUDE ON A HEAVILY LOADED AIRCRAFT.

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.