# NTSB DEN90DQA02: Grumman G-164A, N668U, Deming, NM, August 1, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: August 1, 1990, 10:30 local (16:30 UTC)
- Place: Deming, NM
- Location: 32.2631° N, 107.7525° W: Placed by OpenAirDocs: center of Deming, NM, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=32.2631&lon=-107.7525&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report October 2, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 17792
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN90DQA02
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17792/pdf
- Page: https://openairdocs.org/ntsb/DEN90DQA02

## Probable cause

FAILURE OF THE PILOT TO MAINTAIN CONTROL DURING LANDING ROLL DUE TO THE CONDITION OF THE RUNWAY. CONTRIBUTING TO THE ACCIDENT WAS THE POOR MAINTENANCE OF THE RUNWAY SURFACE.

## Sequence of events

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

- Nose over, landing - roll
  - terrain condition - runway
  - runway maintenance - inadequate, company/operator management (contributing factor)
  - terrain condition - soft
  - aircraft control - not maintained, pilot in command (cause)

## Analysis

DURING LANDING ROLL AT A PRIVATE AIR STRIP USED BY THE AGRICULTURAL APPLICATOR THE AIRCRAFT MAIN LANDING GEAR HIT A SOFT SPOT IN THE RUNWAY AND THE AIRCRAFT FLIPPED OVER. THERE WAS NO SPILLAGE OF HAZARDOUS MATERIAL.

## Aircraft

- Registration: [N668U](https://openairdocs.org/deregistered/N668U-1996-01-08), registration cancelled 1996-01-08, S/N 408 (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: 408
- Airframe hours: 5255
- Engines: P&W R-985-AN-1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: By Ag Air Service
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, March 1, 1990, 110 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 3,214 total, 2,764 in this make and model, 3,184 as pilot in command, 540 in the last 90 days, 180 in the last 30 days, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 8 knots
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 84 °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 19900801029509A](https://openairdocs.org/incident/19900801029509A), Aug 1, 1990: Scwzer G164A, Deming, NM, Substantial damage. Wheels hit a soft spot on the ag strip on landing roll. Aircraft nosed over.

## Other investigations on N668U (1)

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 FTW70D0039](https://openairdocs.org/ntsb/FTW70D0039), Jun 27, 1969: Grumman G-164 (N668U), Danbury, TX, substantial damage

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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.