# NTSB FTW85LA162: North American AT-6G, N9035Z, Frederick, OK, March 23, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 23, 1985, 15:30 local (21:30 UTC)
- Place: Frederick, OK
- Coordinates: 34.380744, -99.010841 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.3807&lon=-99.0108&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21706
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85LA162
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21706/pdf
- Page: https://openairdocs.org/ntsb/FTW85LA162

## 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,tailwheel assembly - not engaged (cause)
  - directional control - not maintained, pilot in command (contributing factor)
- Gear collapsed, landing - roll
  - landing gear,main gear attachment - overload

## Analysis

THE PASSENGER HEARD A LOUD MECHANICAL NOISE FROM THE TAIL OF THE AIRCRAFT DURING ROLLOUT FROM A TOUCH-AND-GO LANDING. THE PILOT WAS UNABLE TO MAINTAIN DIRECTIONAL CONTROL, THE AIRCRAFT GROUND LOOPED, THE MAIN LANDING GEAR COLLAPSED, AND THE WINGS WERE SUBSTANTIALLY DAMAGED. CHEVRON-SHAPED SKID MARKS WERE LEFT BY THE TAIL WHEEL. THE PILOT ATTRIBUTED THE LOSS OF CONTROL TO AN IMPROPERLY SEATED TAILWHEEL LOCKING PIN.

## Aircraft

- Registration: [N9035Z](https://openairdocs.org/aircraft/N9035Z), registered now, S/N 168094, built 1949 (OpenAirDocs)
- Reported make and model: NORTH AMERICAN AT-6G
- Registry model: [North American T-6G](https://openairdocs.org/model/north-american-t-6g) (registry code 6400432) (OpenAirDocs)
- Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 49-2990
- Airframe hours: 8748
- Engines: P&W R1340-AN1 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Glen Johnson
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, September 10, 1984, 34 hours before
- Airport: FDR, Frederick Muni., runway 17, 6,000 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 37; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: front; flight hours: 490 total, 25 in this make and model, 391 as pilot in command, 28 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 130° at 5 knots, gusting 10
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 50 °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 19850323070439A](https://openairdocs.org/incident/19850323070439A), Mar 23, 1985: Namer T6G, Frederick, OK, Substantial damage. Ground looped on rollout with main gear failure. Tail wheel locking pin may not have been seated.

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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