# NTSB DFW06CA081: Grumman-Schweizer G-164B, N6641Q, Texarkana, AR, March 4, 2006

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Data collection · Final report
- Date: March 4, 2006, 06:30 local (12:30 UTC)
- Place: Texarkana, AR
- Coordinates: 33.496387, -93.798057
- Nearby events: https://openairdocs.org/map.md?lat=33.4964&lon=-93.7981&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report May 30, 2006
- Report: Approved by Office Director
- Parties: FAA Flight Standards District Office
- NTSB case key (mKey): 63320
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DFW06CA081
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/63320/pdf
- Page: https://openairdocs.org/ntsb/DFW06CA081

## Probable cause

The loss of engine power due to a cracked cylinder.  Contributing factors were the pilot's failure to maintain adequate airspeed.

## Sequence of events

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

- Loss of engine power, climb
  - engine assembly,cylinder - cracked (cause)
- Loss of control - in flight, descent - uncontrolled
  - airspeed - not maintained, pilot in command (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - muddy

## Analysis

The 828-hour commercial pilot of the single-engine agricultural application airplane, took off from a 3,500-feet long by 100-feet wide private grass strip on a northerly heading.  During climb-out, as the pilot initiated a turn to the east, the engine began to vibrate and run rough, and subsequently lost power.  The pilot reported that he activated the dump valve to release the insecticide payload in order to lighten its weight.  The pilot then stated that the airplane "rolled to the left past 80-degrees. "  The airplane impacted muddy terrain in a near vertical attitude.  The airplane was equipped with a 5-point restraint system that held the pilot in place.  Examination of the radial engine by the operator revealed the number three cylinder was cracked.

## Factual narrative

The 828-hour commercial pilot of the single-engine agricultural application airplane, took off from a 3,500-feet long by 100-feet wide private grass strip on a northerly heading.  During climb-out, as the pilot initiated a turn to the east, the engine began to vibrate and run rough, and subsequently lost power.  The pilot reported that he activated the dump valve to released the insecticide payload in order to lighten its weight.  The pilot then stated the airplane "rolled to the left past 80-degrees. "  The airplane impacted muddy terrain in a near vertical attitude.  The airplane was equipped with a 5-point restrain system that held the pilot in place.  Examination of the radial engine by the operator revealed the number three cylinder was cracked.

## Aircraft

- Registration: [N6641Q](https://openairdocs.org/deregistered/N6641Q-2014-11-12), registration cancelled 2014-11-12, S/N 171B (OpenAirDocs)
- Reported make and model: Grumman-Schweizer 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: 171B
- Airframe hours: 9445
- Engines: Pratt & Whitney R1340 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Ark Tex Avation, Inc.
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, October 1, 2005
- Departed: Texarkana, AR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 28; injuries: minor; commercial; airplane ratings: single-engine land; medical: class 2, with waivers/limitations; last flight review April 1, 2004; seat: single; flight hours: 828 total, 600 in this make and model, 828 as pilot in command, 25 in the last 90 days, 25 in the last 30 days, 0 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 80° at 10 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 59 °F, dew point 30 °F
- Altimeter: 30.23 inHg
- Observed at: TXK, 15 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 20060304003039A](https://openairdocs.org/incident/20060304003039A), Mar 4, 2006: Scwzer G164B, Hervey, AR, Substantial damage. (-23) On 03/04/2006 N6641Q serial number 171B, a Grumman G-164-B, operated by ark-tex aviation incorporated, texarkana, Arkansas, flown by the pilot [privacy…

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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