# NTSB FTW83LA019: North American F-51D, N11T, Piedmont, OK, October 23, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: October 23, 1982, 12:00 local (17:00 UTC)
- Place: Piedmont, OK
- Coordinates: 35.670295, -97.750907 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.6703&lon=-97.7509&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 23, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 72225
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW83LA019
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/72225/pdf
- Page: https://openairdocs.org/ntsb/FTW83LA019

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise - normal
  - accessory drive assy,drive shaft - failure,total (cause)
- Forced landing, landing - flare/touchdown
- Main gear collapsed, landing - flare/touchdown
  - gear down and locked - delayed, pilot in command

## Analysis

THE ENG FAILED AT 5,500 FT MSL. DURING AN EMERGENCY LANDING AT A 5,000 FT DIRT STRIP (UNDER CONSTRUCTION FOR PAVING), GEAR EXTENSION WAS DELAYED TO INCREASE GLIDE. THE RIGHT GEAR DID NOT HAVE TIME TO LOCK DOWN & RETRACTED DURING LANDING. INITIAL EXAM OF THE ENG REVEALED THAT THERE WAS NO VALVE ACTION IN THE CYLINDERS WHEN THE ENG WAS ROTATED ALTHOUGH BOTH MAGNETOS OPERATED NORMALLY. DISASSEMBLY CONFIRMED THAT THE GEAR SHAFT, P/N 620078, WHICH OPERATES THE TWO ENG CAMSHAFTS HAD SHEARED.

## Aircraft

- Registration: [N11T](https://openairdocs.org/deregistered/N11T-2005-04-07), registration cancelled 2005-04-07, S/N 44-74425, built 1957 (OpenAirDocs)
- Reported make and model: NORTH AMERICAN F-51D
- Registry model: [North American P-51D](https://openairdocs.org/model/north-american-p-51d) (registry code 6402319) (OpenAirDocs)
- Registry engine: [Rolls-Royce MERLIN](https://openairdocs.org/engine/rolls-royce-merlin) (registry code 54502, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 4474425
- Airframe hours: 911
- Engines: MERLIN V1650-9A 1375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Robert Amyx
- Registered owner: Robert Amyx
- Departed: WPA, OKLAHOMA CITY, OK
- Destination: WPA, OKLAHOMA CITY, OK
- Airport: OKI5, Jack Richards, runway 17, 5,000 × 0 ft, dirt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 61; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; flight hours: 12,385 total, 378 in this make and model, 7,990 as pilot in command, 35 in the last 90 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 6 knots
- Visibility: 20 statute miles
- Temperature: 167 °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 19821023054959A](https://openairdocs.org/incident/19821023054959A), Oct 23, 1982: Namer F51D, Piedmont, OK, Substantial damage. Engine quit on local flight. Landed at local strip. Right main in transit at touchdown. Upper camshaft gear failed.

## Other investigations on N11T (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 OAK75FVM12](https://openairdocs.org/ntsb/OAK75FVM12), Nov 10, 1974: N.American F-51D (N11T), Hf Moon Bay, CA, 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.

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