# NTSB LAX91LA384: North American AT-6D, N3660V, Hayward, CA, September 2, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: September 2, 1991, 14:28 local (21:28 UTC)
- Place: Hayward, CA
- Coordinates: 37.670288, -122.079574 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.6703&lon=-122.0796&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 3, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 27351
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX91LA384
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/27351/pdf
- Page: https://openairdocs.org/ntsb/LAX91LA384

## Probable cause

THE FAILURE OF THE PILOT TO MAINTAIN DIRECTIONAL CONTROL OF THE AIRCRAFT WHILE CORRECTING AN UNWANTED DEVIATION.

## Sequence of events

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

- Loss of control - on ground/water, landing - roll
  - landing gear,main gear strut - other
  - remedial action - excessive, pilot in command (cause)
  - directional control - not maintained, pilot in command (cause)
  - ground loop/swerve - inadvertent, pilot in command (cause)
- On ground/water encounter with terrain/water, landing - roll

## Analysis

THE PILOT SAID THE WHEEL LANDING WAS SMOOTH. DURING THE ROLL OUT, THE RIGHT LANDING GEAR STRUT LOWERED, WHICH DROPPED THE RIGHT WING, AND THE AIRCRAFT BEGAN A TURN TO THE RIGHT. THE PILOT SAID HE APPLIED LEFT AILERON AND RUDDER, AND, POWER TO CORRECT THE TURN. THE LEFT WING THEN CONTACTED THE GROUND, THE AIRCRAFT GROUND LOOPED, AND THE LANDING GEAR COLLAPSED.

## Aircraft

- Registration: [N3660V](https://openairdocs.org/aircraft/N3660V), registered now, S/N 42-44722, built 1943 (OpenAirDocs)
- Reported make and model: NORTH AMERICAN AT-6D
- Registry model: [North American AT-6](https://openairdocs.org/model/north-american-at-6) (registry code 6400402) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 42-44722
- Engines: P&W R-1340 600 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Richard D. Tabery
- Registered owner: Richard D. Tabery
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, September 10, 1990, 26 hours before
- Departed: N35, HALF MOON BAY, CA
- Airport: HWD, Hayward, runway 28, 5,024 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 63; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 1,620 total, 32 in this make and model, 1,398 as pilot in command, 55 in the last 90 days, 17 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 300° at 5 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Altimeter: 29.00 inHg
- Observed at: HWD, 1 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 19910902037349A](https://openairdocs.org/incident/19910902037349A), Sep 2, 1991: Namer AT6, Hayward, CA, Substantial damage. Ground looped on landing roll. Collapsing outside main gear. Blamed uneven olio on landing. No defects noted.

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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