# NTSB FTW90DRD12: Grumman G-164A, N6572, Bastrop, LA, June 10, 1990

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Final report
- Date: June 10, 1990, 06:10 local (11:10 UTC)
- Place: Bastrop, LA
- Coordinates: 32.770637, -91.899429 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=32.7706&lon=-91.8994&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report September 21, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 22988
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW90DRD12
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22988/pdf
- Page: https://openairdocs.org/ntsb/FTW90DRD12

## Probable cause

THE PILOT'S IMPROPER ENGINE PROCEDURES DURING GROUND OPERATIONS AND PRIOR TO TAKEOFF WHICH RESULTED IN FOULED SPARK PLUGS.

## Sequence of events

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

- Loss of engine power(partial) - nonmechanical, maneuvering - aerial application
  - ignition system,spark plug - fouled (cause)
  - procedures/directives - not followed, pilot in command (cause)
- Forced landing, descent - emergency
  - stall/mush - inadvertent, pilot in command (contributing factor)
  - aerial application equipment - blocked(partial) (contributing factor)
- Nose over, landing - roll
  - terrain condition - soft (contributing factor)
  - terrain condition - rough/uneven (contributing factor)

## Analysis

THE AERIAL APPLICATION PILOT STATED THAT HE WAS IN A SLOW TURN TO THE LEFT LOOKING FOR THE FLAGMAN WHEN THE AIRPLANE 'BEGAN TO FALL.' HE ROLLED OUT OF THE TURN BUT WAS UNABLE TO MAINTAIN FLIGHT. FULL POWER WAS ADDED AND THE PILOT UNSUCCESSFULLY ATTEMPTED TO DUMP THE LOAD OF CHEMICAL. THE FORCED LANDING IN SOFT MUDDY TERRAIN RESULTED IN A NOSEOVER. THE OWNER OF THE AIRPLANE REPORTED THAT THE PILOT WAS ON THE GROUND APPROXIMATELY 20 MINUTES WITH THE ENGINE IDLING, AND THAT DURING TAKEOFF THE ENGINE DID NOT DEVELOP FULL POWER. HE FURTHER STATED THAT HE HAD CAUTIONED THE PILOT ABOUT CLEARING THE ENGINE BEFORE TAKEOFF. THE CHEMICAL DUMP LEVER WAS BLOCKED BY THE IMPROPERLY POSITIONED PRESSURE VALVE LEVER.

## Aircraft

- Registration: [N6572](https://openairdocs.org/deregistered/N6572-1990-12-12), registration cancelled 1990-12-12, S/N 712 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (OpenAirDocs)
- Category: Airplane
- Serial number: 712
- Airframe hours: 4700
- Engines: P&W R985-AN-1 450 horsepower reciprocating
- Damage: Destroyed
- Flight: Aerial application, Part 137
- Operator: Leroy Robinson
- Registered owner: Leroy Robinson
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, June 8, 1990, 10 hours before
- Departed: NONE
- Airport: NONE, runway 27, 3,000 × 100 ft, dirt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 32; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 1,200 total, 800 in this make and model, 250 in the last 90 days, 200 in the last 30 days, 15 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 40 statute miles
- Lowest ceiling: none
- Temperature: 75 °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 19900610019549A](https://openairdocs.org/incident/19900610019549A), Jun 10, 1990: Scwzer G164A, Bastrop, LA, Destroyed. Low and slow over rice field,stalled in a turn. Unable to dump load,struck ground full power in mush. Nosed over.

## Other investigations on N6572 (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 NYC78FFJ32](https://openairdocs.org/ntsb/NYC78FFJ32), Jul 31, 1978: Grumman G-164A (N6572), Huron, NY, substantial damage
- [NTSB FTW71FRA43](https://openairdocs.org/ntsb/FTW71FRA43), Mar 31, 1971: Grumman G-164 (N6572), Bay City, TX, destroyed

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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