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ASN Wikibase Occurrence # 164225
Last updated: 20 January 2021
This record has been locked for editing.

Date:23-FEB-2014
Time:13:35
Type:Silhouette image of generic RV9 model; specific model in this crash may look slightly different
Van's RV-9A
Owner/operator:Private
Registration: N19VC
C/n / msn: 90319
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:South Mt. Plymouth, FL -   United States of America
Phase: Landing
Nature:Private
Departure airport:Marsh Harbour, FN (MYAM)
Destination airport:Sanford, FL (SFB)
Investigating agency: NTSB
Narrative:
The pilot reported that, during the approach to landing, the airplane’s propeller stopped spinning but that the engine continued functioning normally. He subsequently made a forced landing to a field. During the landing, the airplane flipped over and came to rest inverted, which resulted in substantial damage to the wings and vertical stabilizer.
Postaccident examination of the engine revealed that the spline shaft had uncoupled from the drive disk adapter. The splines of the spline shaft, the drive disk adapter, and the propeller speed reduction unit (PSRU) input spline exhibited signs of severe wear consistent with fretting corrosion. Research revealed that several spline shaft failures had occurred on other airplanes; some of the failures resulted in a loss of engine power and subsequent forced landings, whereas some of the failures were identified during inspection. The manufacturer issued guidance to users to apply a nickel or copper antiseize compound on the spline shaft during installation of the PSRU to decrease wear; however, the manufacturer did not provide users with any instructions or recommendations to routinely inspect and lubricate the spline components. The pilot/builder reported that the PSRU and spline shaft had not been removed, lubricated, or inspected since it had been installed about 325 hours before the accident.



Probable Cause: The failure of the propeller spline shaft, the drive disk adapter, and the propeller speed reduction unit (PSRU) input spline due to a lack of inspection and lubrication, which resulted in a total loss of propeller drive and a subsequent forced landing. Contributing to the accident was the lack of manufacturer guidance for inspecting and lubricating the PSRU gearbox spline components.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20140224X15602&key=1
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=19VC

https://flightaware.com/live/flight/N19VC


Revision history:

Date/timeContributorUpdates
24-Feb-2014 03:07 Geno Added
06-Mar-2014 01:51 Geno Updated [Time, Nature, Source, Damage, Narrative]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
29-Nov-2017 13:34 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]