# NTSB CHI85LA079: Piper PA-23-250, N6505Y, New Philadelphi, OH, December 27, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 26, 1984, 20:00 local (Dec 27, 1984, 01:00 UTC)
- Place: New Philadelphi, OH
- Coordinates: 40.480354, -81.439147 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.4804&lon=-81.4391&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12979
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI85LA079
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12979/pdf
- Page: https://openairdocs.org/ntsb/CHI85LA079

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise - normal
  - propeller system/accessories - separation (cause)
  - propeller system/accessories - fatigue (cause)
  - emergency procedure - performed, pilot in command
- Forced landing, landing

## Analysis

PLT FELT VIBRATION AND REDUCED POWER ON BOTH ENGINES TO IDLE. PLT HEARD A 'THUD' AND DISCOVERED THE LEFT PROPELLER HAD SEPARATED CUTTING THROUGH THE NOSE OF THE ACFT AS IT DEPARTED. THE PROPELLER WAS NOT LOCATED. TWO OF THE SIX PROPELLER BOLTS REMAINED WITH THE ACFT. METALLURGICAL EXAM OF THE TWO BOLTS REVEALED FATIGUE PROGRESSION STEMMING FROM NUMEROUS ORIGINS.

## Aircraft

- Registration: [N6505Y](https://openairdocs.org/deregistered/N6505Y-2013-08-19), registration cancelled 2013-08-19, S/N 27-3793, built 1967 (OpenAirDocs)
- Reported make and model: PIPER PA-23-250
- Registry model: [Piper PA-23-250](https://openairdocs.org/model/piper-pa-23-250) (registry code 7102308) (OpenAirDocs)
- Registry engine: [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series) (registry code 41533, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Serial number: 27-3793
- Airframe hours: 9890
- Engines: LYCOMING IO-540-C4B5 250 horsepower reciprocating
- Damage: Substantial damage
- Flight: Positioning, Part 91
- Operator: Appalachian Aviation
- Registered owner: Lewis J. Manyak
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, December 3, 1984, 353 hours before
- Departed: 22I, MCARTHUR, OH
- Destination: ERI, ERIE, PA
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 27; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; flight hours: 19,541 total, 3,026 in this make and model, 17,577 as pilot in command, 2,826 in the last 90 days, 10 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 90° at 8 knots
- Visibility: 12 statute miles
- Lowest ceiling: 8,000 ft overcast
- Temperature: 27 °F, dew point 18 °F
- Altimeter: 30.00 inHg
- Observed at: CAK, 28 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 19841226070589A](https://openairdocs.org/incident/19841226070589A), Dec 26, 1984: Piper PA23250, New Philadelphi, OH, Substantial damage. Pilot felt vibration and thud. Left propeller separated striking nose, two bolts remained. Safe landing made.

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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