# NTSB ATL93LA132: Grumman G-164A, N4824, Atmore, AL, July 23, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: July 23, 1993, 10:00 local (15:00 UTC)
- Place: Atmore, AL
- Coordinates: 31.019388, -87.489479 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=31.0194&lon=-87.4895&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report July 25, 1994
- Report: Approved by Office Director
- NTSB case key (mKey): 3243
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL93LA132
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/3243/pdf
- Page: https://openairdocs.org/ntsb/ATL93LA132

## Probable cause

THE TOTAL FAILURE OF THE ENGINE SUPERCHARGER, WHICH RESULTED IN ENGINE STOPPAGE. A FACTOR WAS THE ROUGH TERRAIN AT THE FORCED LANDING SITE.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, climb - to cruise
  - eng assembly,blower/impeller/integral supercharger - failure,total (cause)
- Forced landing, descent - emergency
- Nose over, landing - roll
  - terrain condition - rough/uneven (contributing factor)

## Analysis

THE AG PILOT REPORTED THAT THE ENGINE LOST POWER ABOUT 1 MILE PAST THE DEPARTURE AIRSTRIP. THE AIRCRAFT CLEARED SOME TREES AND POWER LINES, AND WAS FORCE LANDED IN A CORN FIELD. THE AIRCRAFT NOSED OVER ON THE ROUGH TERRAIN. AN EXAMINATION OF THE ENGINE REVEALED THAT THE SUPERCHARGER ASSEMBLY HAD FAILED.

## Factual narrative

On July 23, 1993, at about 1000 central daylight time, a Grumman G-164A, N4824, nosed over during landing following a reported engine power loss near Atmore, Alabama. The commercial pilot was not injured. The aircraft was substantially damaged. The aircraft was operated under 14 CFR Part 137 by Wallace Flying Service, Inc., of Atmore. Visual meteorological conditions prevailed at the time, and no flight plan was filed for the local, aerial application flight. The flight was originating at the time of the accident.

The pilot reported the following: He took off on runway 27 and turned toward the west-southwest. At about one mile from the airstrip, and over a wooded area, the engine lost power. He force landed the airplane in a corn field after clearing power lines. After touchdown, the aircraft nosed over on the rough terrain.

The aircraft was recovered to the operator's facility following the accident. A partial disassembly of the engine revealed that the supercharger assembly had failed.

## Aircraft

- Registration: [N4824](https://openairdocs.org/deregistered/N4824-2016-11-16), registration cancelled 2016-11-16, S/N 1101, built 1973 (OpenAirDocs)
- Reported make and model: GRUMMAN G-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: 1101
- Airframe hours: 6539
- Engines: P&W R-1340-AN-1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Wallace Flying Service, Inc.
- Registered owner: Wallace Flying Service, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, March 6, 1993, 95 hours before

## 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: center; flight hours: 9,500 total, 495 in this make and model, 9,400 as pilot in command, 95 in the last 90 days, 40 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 340° at 11 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 86 °F, dew point 75 °F
- Altimeter: 30.00 inHg
- Observed at: MOB, 42 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 19930723025479A](https://openairdocs.org/incident/19930723025479A), Jul 23, 1993: Scwzer G164A, Atmore, AL, Substantial damage. Engine quit one mile after takeoff. Nosed over in rough terrain landing. Engine supercharger had failed.

## Other investigations on N4824 (1)

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 MIA77FKJ44](https://openairdocs.org/ntsb/MIA77FKJ44), Jun 1, 1977: Grumman G-164A (N4824), Centreville, AL, 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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