# NTSB MIA91LA122: Grumman G-164B, N8386K, Clewiston, FL, April 15, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: April 15, 1991, 10:30 local (14:30 UTC)
- Place: Clewiston, FL
- Coordinates: 26.750505, -80.930061 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=26.7505&lon=-80.9301&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report January 25, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 32851
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA91LA122
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32851/pdf
- Page: https://openairdocs.org/ntsb/MIA91LA122

## Probable cause

DISINTEGRATION OF THE IMPELLER FOR UNDETERMINED REASONS RESULTING IN THE TOTAL LOSS OF ENGINE POWER NECESSITATING THE FORCED LANDING.

## Sequence of events

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

- Loss of engine power, maneuvering - aerial application
  - compressor assembly,impeller - disintegrated (cause)
  - compressor assembly,impeller - undetermined (cause)
- Forced landing, descent - emergency
- Nose over, landing - flare/touchdown

## Analysis

WHILE MANEUVERING AT AN ALT OF 35 FT AGL, THE PLT STATED THAT THE ENG LOST ALL POWER.  HE LANDED THE ACFT IN A FIELD & AFTER TOUCHDOWN, THE ACFT NOSED OVER & CAME TO REST INVERTED. EXAM OF THE ENG REVEALED THAT THE IMPELLER WAS DISINTEGRATED WITH PORTIONS LOCATED IN THE NO. 7 CYLINDER ASS'Y.  NO DETERMINATION COULD BE MADE AS TO THE REASON FOR THE IMPELLER FAILURE.  THE IMPELLER ASS'Y WAS OVERHAULED 912 HOURS EARLIER.

## Aircraft

- Registration: [N8386K](https://openairdocs.org/aircraft/N8386K), registered now, S/N 678B (OpenAirDocs)
- Reported make and model: GRUMMAN 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)
- Category: Airplane
- Serial number: 6788
- Airframe hours: 4750
- Engines: P&W R1340-AN1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Airwork Enterprises Of Fla,Inc
- Registered owner: Airwork Enterprises Of Fla,Inc
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, February 19, 1991, 21 hours before
- Airport: NONE, Tribritton

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; flight hours: 7,800 total, 6,000 in this make and model, 7,800 as pilot in command, 200 in the last 90 days, 80 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 2 knots
- Visibility: 6 statute miles
- Lowest ceiling: none
- Temperature: 81 °F
- Altimeter: 30.00 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 19910415014329A](https://openairdocs.org/incident/19910415014329A), Apr 15, 1991: Scwzer G164B, Clewiston, FL, Substantial damage. Engine quit on initial climbout. Nosed over on forced landing. Supercharger impeller had disintegrated.

## Other investigations on N8386K (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 ERA19LA267](https://openairdocs.org/ntsb/ERA19LA267), Sep 8, 2019: Grumman G164 (N8386K), Berlin, MD, substantial damage. Probable cause: The malfunction of the No. 9 pushrod, which resulted in a total loss of engine power.
- [NTSB SEA05CA157](https://openairdocs.org/ntsb/SEA05CA157), Aug 3, 2005: Grumman G-164B (N8386K), Paul, ID, substantial damage. Probable cause: The failure of the pilot to maintain direction control during the landing roll, which resulted in a nose over. Contributing factors included the weeds and the wet, soft terrain..

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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