# NTSB MIA87LA254: Grumman G-164B, N6647Q, Bristol, FL, September 21, 1987

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: September 21, 1987, 11:35 local (15:35 UTC)
- Place: Bristol, FL
- Coordinates: 30.420003, -84.96936 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=30.4200&lon=-84.9694&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report January 25, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 31969
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA87LA254
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/31969/pdf
- Page: https://openairdocs.org/ntsb/MIA87LA254

## Sequence of events

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

- Loss of engine power, cruise
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
- In flight collision with object, approach
  - object - tree(s) (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE ENG BEGAN LOSING POWER AS THE PLT WAS EN ROUTE TO SPRAY A FIELD. HE WAS UNABLE TO MAINTAIN ALTITUDE, DUMPED THE LOAD OF CHEMICALS & PREPARED FOR AN EMERG LANDING. WHILE HE WAS ATTEMPTING TO REACH AN OPEN FIELD, THE ACFT COLLIDED WITH 100 FOOT TREES, THEN CRASHED IN THE FIELD. NO REASON WAS FOUND FOR THE LOSS OF POWER.

## Aircraft

- Registration: [N6647Q](https://openairdocs.org/deregistered/N6647Q-2013-04-30), registration cancelled 2013-04-30, S/N 174B (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: 1748
- Airframe hours: 1745
- Engines: P&W R-985-AN1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Bobby W. Yon, doing business as Altha Air Service
- Registered owner: Bobby W Yon
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, July 26, 1987
- Departed: ALTHA, FL

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 48; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 6,099 total, 3,200 in this make and model, 6,054 as pilot in command, 140 in the last 90 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 10° at 10 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 82 °F, dew point 55 °F
- Altimeter: 30.00 inHg
- Observed at: PFN, 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 19870921054359A](https://openairdocs.org/incident/19870921054359A), Sep 21, 1987: Scwzer G164B, Bristol, FL, Substantial damage. Engine lost power enroute to spray field. Crash landed in trees. Engine problem could not be determined.

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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