# NTSB FTW86LRG21: Grumman G-164B, N6740Q, Port O'Connor, TX, May 20, 1986

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: May 20, 1986, 16:00 local (21:00 UTC)
- Place: Port O'Connor, TX
- Coordinates: 28.440811, -96.48983 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=28.4408&lon=-96.4898&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 22156
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW86LRG21
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22156/pdf
- Page: https://openairdocs.org/ntsb/FTW86LRG21

## Sequence of events

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

- Loss of engine power(partial) - mech failure/malf, maneuvering - aerial application
  - engine assembly,push rod - failure,total (cause)
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
- Nose over, landing - flare/touchdown
  - terrain condition - soft (cause)
  - terrain condition - none suitable (cause)

## Analysis

ACFT FLIPPED OVER ON TOUCHDOWN DURING AN EMERGENCY LANDING IN A CULTIVATED FIELD FOLLOWING A PARTIAL POWER LOSS DURING A SWATH RUN AT 30 FT AGL. INVESTIGATION REVEALED THAT THE NO. 1 CYL EXHAUST VALVE PUSH ROD HAD FAILED. EXACT CAUSE OF THE PUSH ROD FAILURE WAS NOT DETERMINED.

## Aircraft

- Registration: N6740Q (not matched to a registry record)
- Reported make and model: GRUMMAN G-164B
- Category: Airplane
- Serial number: 254-B
- Airframe hours: 3533
- Engines: P&W R-1340-4N1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Donald R. White
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Unknown, April 20, 1986, 90 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 42; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 10,900 total

## Weather

- Conditions: Visual (VMC), Day
- Wind: 30° at 5 knots
- Visibility: 15 statute miles
- Temperature: 82 °F, dew point 55 °F
- Altimeter: 29.00 inHg
- Observed at: IAH, 130 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 19860520019119A](https://openairdocs.org/incident/19860520019119A), May 20, 1986: Scwzer G164B, Port Oconnor, TX, Substantial damage. The engine lost power and the aircraft flipped over on landing. Number one exhaust valve pushrod broken.

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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