# NTSB LAX87DVG03: Grumman G-164B, N8412K, Marysville, CA, April 18, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: April 18, 1987, 14:00 local (21:00 UTC)
- Place: Marysville, CA
- Coordinates: 39.229213, -121.779418 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.2292&lon=-121.7794&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report July 5, 1988
- Report: Approved by Office Director
- NTSB case key (mKey): 25340
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX87DVG03
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/25340/pdf
- Page: https://openairdocs.org/ntsb/LAX87DVG03

## Sequence of events

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

- Main gear collapsed, landing - roll
  - landing gear,main gear - separation
  - reason for occurrence undetermined (cause)
- Loss of control - on ground/water, landing - roll
  - directional control - not possible, pilot in command (cause)
  - ground loop/swerve - uncontrolled, pilot in command (cause)
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - dirt bank/rising embankment
- Nose down, landing - roll

## Analysis

AT THE END OF AN AERIAL APPLICATION FLT, THE PLT WAS AWARE OF A CROSS WIND FROM THE RIGHT. THE PLT TOUCHED THE ACFT DOWN ON THE RIGHT MAIN LANDING GEAR AND HELD THAT ATTITUDE FOR APRX 300 FT DOWN THE RWY. WHEN THE LEFT MAIN GEAR CONTACTED THE RWY IT FOLDED BACK AND SEPARATED FROM THE FUSELAGE. THE ACFT SKIDDED TO THE LEFT SIDE OF THE RWY, HIT A DIRT BANK AND NOSED DOWN. THE ACCIDENT WAS REPORTED AFTER THE ACFT HAD BEEN MOVED BY MAINTENANCE PERSONNEL. IN THE PROCESS EVIDENCE WAS DESTROYED TO DETERMINE IF A BOLT FOUND BY THE ACFT, IDENTIFIED AS A GEAR BOLT, WHICH WAS THE SAME SIZE AND TYPE AS THAT USED TO FASTEN THE LANDING GEAR ROOT TO THE LANDING GEAR BOX HAD FALLEN FROM THE ACFT. THE BOLT FOUND WAS A MS-20009-140.

## Aircraft

- Registration: [N8412K](https://openairdocs.org/aircraft/N8412K), registered now, S/N 690B (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)
- Category: Airplane
- Serial number: 690B
- Airframe hours: 2893
- Engines: P&W R-1340-AN-1 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Bowles Flying Service
- Registered owner: Bowles Flying Service
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, November 3, 1986, 185 hours before
- Airport: Woodland Coop

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 48; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 9,750 total, 9,000 in this make and model, 9,500 as pilot in command, 20 in the last 90 days, 20 in the last 30 days, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 10 knots, gusting 12
- Visibility: 50 statute miles
- Lowest ceiling: none
- Temperature: 81 °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 19870418010829A](https://openairdocs.org/incident/19870418010829A), Apr 18, 1987: Scwzer G164B, Marysville, CA, Substantial damage. The left main gear collapsed on touchdown. Landing gear box attach bolt fell out. Loose box had been noted before.

## Other investigations on N8412K (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 LAX92LA215](https://openairdocs.org/ntsb/LAX92LA215), May 24, 1992: Schweizer G-164B (N8412K), Live Oak, CA, substantial damage. Probable cause: THE PILOT'S FAILURE TO MAINTAIN DIRECTIONAL CONTROL AND IMPROPER USE OF THE BRAKES.

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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