ASN Wikibase Occurrence # 166626
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| Date: | Saturday 10 May 2014 |
| Time: | 12:15 |
| Type: | Pazmany PL-4 |
| Owner/operator: | Private |
| Registration: | N44PL |
| MSN: | 001 |
| Year of manufacture: | 1972 |
| Total airframe hrs: | 428 hours |
| Engine model: | Volkswagen CONVERSION |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near the Tri-County Airport (2C6), Yates City, IL -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Yates City, IL (2C6) |
| Yates City, IL (2C6) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While in the airport traffic pattern, the airplane sustained a complete loss of thrust and an increase in engine speed, which the pilot interpreted as a loss of engine power to the propeller. He subsequently executed a forced landing to an open field. A postaccident examination revealed that the propeller reduction drive pulley had moved downward within the mounting bracket slot, creating slack in the cog belts that resulted in a loss of input drive power to the propeller. The reduction drive manufacturer did not provide any formal documentation for the installation. As a result, the pilot/builder was not aware that a secondary fitting to secure the pulley within the bracket needed to be installed with the drive unit components.
Probable Cause: A loss of propeller thrust due to a failure of the reduction drive unit resulting from the improper installation of the unit. Contributing to the accident was a lack of documentation for the reduction drive unit installation.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=44PL
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-May-2014 06:23 | Geno | Added |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 29-Nov-2017 14:23 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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