# NTSB LAX83LA062: Piper PA-34-200T, N477BL, Prescott, AZ, December 31, 1982

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 31, 1982, 11:40 local (18:40 UTC)
- Place: Prescott, AZ
- Coordinates: 34.620491, -112.419975 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=34.6205&lon=-112.4200&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report December 31, 1983
- Report: Approved by Office Director
- NTSB case key (mKey): 72307
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX83LA062
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/72307/pdf
- Page: https://openairdocs.org/ntsb/LAX83LA062

## 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 - cracked (cause)
  - landing gear,main gear - failure,total (cause)

## Analysis

THE RIGHT MAIN LANDING GEAR COLLAPSED DURING THE LANDING ROLL. ON-SCENE EXAMINATION REVEALED THAT THE RIGHT MAIN GEAR WAS DOWN & LOCKED, BUT A MATERIAL FAILURE IN THE TRUNNION ALLOWED THE GEAR TO ROTATE OUT & CLOCKWISE LEADING TO COLLAPSE. A SIMILARLY LOCATED CRACK HAD BEEN DISCOVERED ON THE LEFT MAIN GEAR ASSEMBLY 67 FLIGHT-HOURS BEFORE THE ACCIDENT. INSPECTION OF THE RIGHT GEAR ASSEMBLY AT THAT TIME REVEALED NO DISCREPANCIES.

## Aircraft

- Registration: [N477BL](https://openairdocs.org/deregistered/N477BL-1992-05-05), registration cancelled 1992-05-05, S/N 347870292 (OpenAirDocs)
- Reported make and model: PIPER PA-34-200T
- Registry model: [Piper PA-34-200T](https://openairdocs.org/model/piper-pa-34-200t) (registry code 7103406) (OpenAirDocs)
- Category: Airplane
- Serial number: 34-7870292
- Airframe hours: 1756
- Engines: CONTINENTAL TSIO-36O-EB1A 200 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Robert G. Milne,III
- Registered owner: Robert G. Milne,III
- Departed: C, SANTA MONICA, CA
- Destination: C, PRESCOTT, AZ
- Flight plan: IFR
- Airport: PRC, Ernest A. Love, runway 3, 7,618 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; private; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: unknown, valid medical--no waivers/lim.; flight hours: 920 total, 413 in this make and model, 751 as pilot in command, 22 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 310° at 7 knots
- Visibility: 40 statute miles
- Temperature: 82 °F
- Altimeter: 30.00 inHg
- Observed at: PRC

## 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 19821231065399A](https://openairdocs.org/incident/19821231065399A), Dec 31, 1982: Piper PA34200T, Prescott, AZ, Substantial damage. Right main gear collapsed on the landing roll. Aircraft ground looped into a snowbank. Cracked trunion failed.

## Other investigations on N477BL (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 LAX87LA292](https://openairdocs.org/ntsb/LAX87LA292), Aug 4, 1987: Piper PA-34-200T (N477BL), El Monte, 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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