# NTSB FTW90DRA05: Grumman 164-B, N9982, Garwood, TX, May 25, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: May 25, 1990, 15:00 local (20:00 UTC)
- Place: Garwood, TX
- Coordinates: 29.450391, -96.509849 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=29.4504&lon=-96.5098&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report December 14, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 22972
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW90DRA05
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22972/pdf
- Page: https://openairdocs.org/ntsb/FTW90DRA05

## Probable cause

THE POWER LOSS DUE TO SUPER CHARGER IMPELLER FAILURE.

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, maneuvering - aerial application
  - eng assembly,blower/impeller/integral supercharger - failure,total (cause)
- Forced landing, descent - emergency
- Nose over, landing - flare/touchdown
  - terrain condition - soft (contributing factor)
  - terrain condition - wet (contributing factor)

## Analysis

THE PILOT SAID HE EXPEREINCED A PARTIAL POWER LOSS OVER THE FIELD HE WAS SPRAYING. HE WAS UNABLE TO MAINTAIN FLIGHT AND PERFORMED A FORCED LANDING IN A WET SOFT ADJACENT RICE FIELD, RESULTING IN A NOSEOVER. ENGINE EXAMINATION REVEALED FAILURE OF THE SUPERCHARGER IMPELLER SHAFT BEARINGS, WHICH CAUSED FAILURE OF THE SUPERCHARGER IMPELLER. FAILED PARTS CONTAMINATED THE AIR INTAKE SYSTEM CAUSING THE INTAKE AND EXHAUST VALVES TO BE WEDGED OPEN.

## Aircraft

- Registration: [N9982](https://openairdocs.org/aircraft/N9982), registered now, S/N 1378, built 1974 (OpenAirDocs)
- Reported make and model: GRUMMAN 164-B
- Registry model: [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (registry code 3952801) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 1378
- Engines: P&W 1340 600 horsepower reciprocating
- Damage: Destroyed
- Flight: Aerial application, Part 137
- Operator: Thompson Dusting Service, doing business as Thompson Flyers, Inc.
- Registered owner: Thompson Dusting Ser. Inc
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, March 1, 1990

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 51; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 12,000 total, 7,000 in this make and model, 12,000 as pilot in command, 300 in the last 90 days, 100 in the last 30 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 90 °F, dew point -0 °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 19900525051629A](https://openairdocs.org/incident/19900525051629A), May 25, 1990: Scwzer G164A, Altair, TX, Destroyed. Tried to depart a weed-grown,soft dirt strip. On liftoff,spreader hit weeds. Aircraft settled,hit a levee and burned

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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