SANDPOINT — A federal investigation into a fatal crash involving a plane with Idaho parts remains locked in a holding pattern.

The National Transportation Safety Board opened an inquiry into the Nov. 30, 2018, crash near Memphis, Indiana, but has been silent ever since a preliminary report was issued on Dec. 13, 2018, records show. The crash involved a Cessna Citation 52A, which was being flown by an airline transport-certified pilot.

Calls to the agency were not immediately returned on Tuesday.

The pilot and two passengers aboard the plane were killed in the crash. The plane was destroyed, according to NTSB.

The corporate-size aircraft crash killed Wayne Estopinal, 63; Sandra Holland Johnson, 54; and pilot Andrew Davis, 32. Estopinal was a prominent architect and a founder of the Louisville City FC soccer team, according to the Courier Journal newspaper in Indiana. The crash occurred in a rural area approximately 16 miles north of Louisville, Kentucky.

"The NTSB investigation of the November 2018 crash in Indiana is ongoing, and our hearts go out to the families of those we lost in the accident. Tamarack, along with the other manufacturers with equipment installed on the aircraft, is supporting the NTSB investigation and we look forward to the final NTSB factual report," Tamarack said in a statement.

The fixed-wing Cessna was reportedly fitted with Tamarack's active winglets, wing extensions which improve fuel efficiency by reducing drag.

The NTSB said the business flight was being operated under meteorological conditions which favored instrument flight rules. The Cessna departed The cross-country flight departed from Clark Regional Airport in Jeffersonville, Indiana, and was bound for Chicago Mid-Way Airport in Illinois.

The agency said the airplane was owned and operated by EstoAir, limited-liability corporation.

According to preliminary information from radar data and air traffic controllers, the Cessna was climbing through 6,000 feet mean sea level when it began a left turn, descended, and disappeared from radar, NTSB said. The pilot had previously been given a frequency change, which was acknowledged, however the pilot never reported to the next controller and no distress message was heard on either frequency. An alert notice was issued for the airplane, NTSB said.

Keith Kinnaird can be reached at kkinnaird@bonnercountydailybee.com or followed at @KeithDailyBee.