# NTSB CHI85FER02: Grumman 164A, N48405, Becker, MN, September 18, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: September 18, 1985, 09:30 local (14:30 UTC)
- Place: Becker, MN
- Coordinates: 45.439651, -93.830566 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=45.4397&lon=-93.8306&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12890
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI85FER02
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12890/pdf
- Page: https://openairdocs.org/ntsb/CHI85FER02

## Sequence of events

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

- Airframe/component/system failure/malfunction, maneuvering - aerial application
  - propeller system/accessories,counterweight - failure,total (cause)
- Loss of engine power(partial) - mech failure/malf, maneuvering - aerial application
  - remedial action - attempted, pilot in command
- In flight collision with terrain/water, descent - uncontrolled
- Nose over, descent - uncontrolled

## Analysis

THE PLT REPORTED THE ENG PWR DROPPED FROM 2000 TO 1550 RPM DURING THE AERIAL APPLICATION FLT. THE PLT INCREASED THROTTLEAND ADVANCED THE PROP WITH NO INCREASE IN PWR. THE ACFT THEN SETTLED TO GROUND IMPACT AND NOSED OVER. POST ACCIDENT INSPECTION DISCLOSED ONE OF THE PROP BLADE COUNTER WEIGHTS HAD FAILED ALLOWING ONE PROP BLADE TO TRAVEL TO A HIGH PITCH (LOW RPM) SETTING WHILE THE OTHER REMAINED IN A LOW PITCH (HIGH RPM) SETTING.

## Aircraft

- Registration: [N48405](https://openairdocs.org/aircraft/N48405), registered now, S/N 1632 (OpenAirDocs)
- Reported make and model: GRUMMAN 164A
- 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: 1632
- Airframe hours: 3195
- Engines: P&W R1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Randy Lahren
- Registered owner: Frank Kasowski
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, May 2, 1985, 339 hours before
- Departed: NONE, BECKER, MN

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 26; commercial; airplane ratings: multi-engine land, single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 2,588 total, 1,754 in this make and model, 2,300 as pilot in command, 270 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 150° at 3 knots
- Visibility: 10 statute miles
- Temperature: 64 °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 19850918045639A](https://openairdocs.org/incident/19850918045639A), Sep 18, 1985: Scwzer G164A, Becker, MN, Substantial damage. Engine lost power on swath turnaround. Nosed over on landing. Prop blade counterweight bolts broke. Lacked lube.

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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