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ASN Wikibase Occurrence # 133927
Last updated: 12 October 2020
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Type:Silhouette image of generic P28A model; specific model in this crash may look slightly different
Piper PA-28-180
Owner/operator:Daniel D. Deferie
Registration: N477SP
C/n / msn: 28-1210
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Lebanon, VA -   United States of America
Phase: En route
Departure airport:VJI
Destination airport:6V3
Investigating agency: NTSB
HISTORY OF FLIGHT On October 30, 1995, at 1830 eastern standard time, a Piper PA-28-180, N477SP, collided with the terrain during an emergency landing near Lebanon, Virginia. The private pilot, the sole occupant, was uninjured. The airplane was destroyed. No flight plan had been filed and night visual meteorological conditions (VMC) prevailed. The flight was conducted under 14 CFR Part 91. The flight originated from Virginia Highlands Airport, Abingdon, Virginia, at approximately 1820 eastern standard time, with an intended destination of Tazewell County Airport, Richlands, Virginia.

The pilot stated that he had just leveled off at five thousand five hundred feet when the airplane began to vibrate severely. He reported that the airplane's attitude was oscillating in the pitch and yaw axis to such an extreme that he immediately turned off the engine. The pilot stated that it was a dark night, but he was in VMC, and he found a pasture in which to make the emergency landing. He indicated that when the airplane touched down on the soft grassy terrain, the nose and left main landing gears separated. Post impact fire destroyed the airplane.

AIRCRAFT INFORMATION The airplane was equipped with the Lycoming O-360-A3A, 180 horsepower engine constructed with a hollow crank-shaft. Attached to the engine was a Sensenich propeller, Model No. 76EM8-0-60, S/N 7139. The owner stated that the airplane was in storage from 1973 until he purchased it in 1995. On May 1, 1995, the airplane was inspected by a certificated Airframe and Powerplant mechanic and was determined to be in airworthy condition.

WRECKAGE INFORMATION Post accident examination revealed that the outboard portion of one blade on the propeller had separated, and could not be found in the vicinity of the wreckage. The remainder of the propeller was removed, and was submitted to the National Transportation Safety Board's (NTSB) metallurgical laboratory for evaluation.

TEST AND RESEARCH Inspection of the propeller showed no "K" stamp after the serial number and the pilot stated that he knew of no placard that existed in the airplane showing that continuous operations at power settings between 2150-2350 RPM were to be avoided. Metallurgical examination of the propeller showed that the fracture in the propeller exhibited fatigue cracking features, which extended through about 80 percent of the cross section of the blade. The NTSB metallurgist reported that they stripped the paint from the propeller " the vicinity of the origin area. Examination revealed the presence of corrosion damage [in] localized areas, including an area directly adjacent to the origin area.

ADDITIONAL INFORMATION In 1969, the Sensenich Propeller Manufacturing Company, Inc. issued an Airworthiness Directive (AD), numbered 69-09-03. This AD pertained to the 76EM8 propeller installed on Lycoming O-360 type engines. The AD required all 76EM series propellers to be modified and a "K" stamped after the serial number. The "K" modification thinned and retuned the entire blade for improved vibratory characteristics. According to the manufacturer, this modification lowered the stresses in the minimum power operating range and narrowed the high stress RPM range to 2200 and 2300 on the hollow crankshaft engine. The AD also required that the tachometer be placarded to avoid continuous operation between 2150-2350 RPM.
PROBABLE CAUSE:failure of the propeller blade due to fatigue cracking originating from corrosion damage. A related factor was the soft terrain encountered during the forced landing.


NTSB id 20001207X04652

Revision history:

21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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