# NTSB FTW90DRD10: Grumman G-164B, N6693Q, Mamou, LA, June 4, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 4, 1990, 08:30 local (13:30 UTC)
- Place: Mamou, LA
- Coordinates: 30.689054, -92.28009 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=30.6891&lon=-92.2801&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 2, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 22986
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW90DRD10
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22986/pdf
- Page: https://openairdocs.org/ntsb/FTW90DRD10

## Probable cause

PILOT MISJUDGED WIND INFORMATION. FACTORS CONTRIBUTING TO THE ACCIDENT WERE THE TAILWIND, THE TREES AND THE LEVEE.

## Sequence of events

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

- In flight encounter with weather, takeoff - initial climb
  - weather condition - tailwind (contributing factor)
  - compensation for wind conditions - inadequate, pilot in command (cause)
- In flight collision with object, takeoff - initial climb
  - object - tree(s) (contributing factor)
- In flight collision with terrain/water, descent - emergency
  - terrain condition - dirt bank/rising embankment (contributing factor)
- Nose over, landing

## Analysis

AG PILOT SAID HE WAS TAKING OFF ON 4TH TRIP FROM SAME STRIP THAT DAY, WHEN  AIRPLANE WOULD NOT CLIMB. HE SAID HE OVER- BOOSTED THE ENGINE TO TRY TO GET OVER TREES. WITH LOW A/S/ AND HIGH ANGLE OF ATTACK, AIRPLANE STARTED TO SETTLE. HE DUMPED LOAD AND LOWERED NOSE. AIRPLANE SETTLED INTO RICE FIELD, HIT A LEVEE, AND FLIPPED FORWARD TO INVERTED POSITION. FAA SAID AIRPLANE HIT SMALL TREES WHEN WIND SHIFTED FROM CROSSWIND TO TAILWIND DURING TAKEOFF.

## Aircraft

- Registration: [N6693Q](https://openairdocs.org/deregistered/N6693Q-2013-04-30), registration cancelled 2013-04-30, S/N 212B, built 1977 (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)
- Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 212B
- Airframe hours: 4541
- Engines: P&W R-985-AN1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Young Patrick Aaron
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, January 15, 1990, 387 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; commercial; airplane ratings: single-engine land; instrument ratings: helicopter, airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 10,213 total, 6,000 in this make and model, 10,069 as pilot in command, 268 in the last 90 days, 138 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 3 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 68 °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 19900604018429A](https://openairdocs.org/incident/19900604018429A), Jun 4, 1990: Scwzer G164B, Mamou, LA, Substantial damage. Struck trees on climbout from an unimproved strip. Blamed a windshift but wind was light and variable.

## Other investigations on N6693Q (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 FTW93LA179](https://openairdocs.org/ntsb/FTW93LA179), Jun 5, 1993: Grumman-Schweizer G-164B (N6693Q), Kaplan, LA, substantial damage. Probable cause: THE PILOT'S FAILURE TO HAVE THE AIRPLANE PROPERLY ATTENDED DURING START WHEN PEOPLE WERE AVAILABLE. A FACTOR WAS THE INADEQUATE TIE DOWN ROPE.
- [NTSB FTW89DRD06](https://openairdocs.org/ntsb/FTW89DRD06), Jun 6, 1989: Grumman-Schweizer G-164B (N6693Q), Ville Platte, LA, substantial damage. Probable cause: WEAR AND/OR FAILURE OF THE CARBURETOR/FLOAT. FACTORS RELATED TO THE ACCIDENT WERE: THE TERRAIN CONDITIONS.

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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