N3907T

On September 29, 2018, about 1240 eastern daylight time, a Diamond Aircraft Industries, Inc. (Diamond) DA20-C1, N397JA, owned and operated by Aamro Aviation Corporation, and a privately owned and operated Piper PA28R-180, N3907T, collided at the Sebring Regional Airport (SEF), Sebring, Florida. There were no injuries to the flight instructor aboard the Diamond or the private pilot and passenger aboard the Piper, while the student pilot aboard the Diamond sustained a minor injury. Both airplanes were substantially damaged. The Diamond and Piper airplanes were being operated under the provisions of Title 14 Code of Federal Regulations Part 91 as an instructional flight, and a personal flight, respectively. Visual meteorological conditions prevailed at the time and neither flight had filed a flight plan. The Diamond originated from SEF about 5 minutes earlier, while the Piper originated from the Peter O'Knight Airport (TPF), Tampa, Florida, about 1015.The flight instructor of the Diamond reported that he and the student pilot were practicing touch and go landings on runway 14 at SEF, an uncontrolled airport, with the wind from the east. During the second traffic pattern while on the upwind leg of the airport traffic pattern, he noticed a Piper arriving from the west, heading east. As the student pilot turned onto the crosswind and downwind legs of the airport traffic pattern, they lost sight of the Piper, and at that point he did not know if the Piper was transitioning the area or intended to enter the airport traffic pattern. If the Piper was to remain in the airport traffic pattern, he assumed that the pilot would enter left traffic of the airport traffic pattern for runway 14 behind them. The student pilot announced the Diamond's position on every leg of the airport traffic pattern making left turns, but neither pilot heard the pilot of the Piper acknowledge. The Diamond turned onto the base and final legs of the airport traffic pattern, and although the flight instructor was looking for the Piper, he did not see it. After landing on runway 14, the Diamond was configured for takeoff, and just as the student pilot advanced the throttle to full, the tail was contacted by the Piper's left wing.

The pilot of the Piper reported that he approached SEF from the northwest quadrant, and the first radio call he made on the SEF common traffic advisory frequency (CTAF) was when the airplane was near the airport crossing midfield at 1,200 feet mean sea level (msl). He reported turning onto the downwind leg of the airport traffic pattern for runway 19, which he announced, then turned onto the base and final legs of the airport traffic pattern, which he also announced making left turns. He planned to touchdown at the 1,000-foot marker, and when flaring about 1 to 2 feet above runway 19, just before the collision, he noted a flash off his right wing. After the collision, he touched down, taxied onto taxiway A2, and secured the airplane.

Postaccident examination of the Diamond revealed the transceiver was set to 122.7 MHz (published CTAF); however, the transceiver of the Piper was set to 122.725 MHz. Operational testing of the transceiver in the Diamond revealed the transmissions were heard on a portable VHF transceiver, while transmissions from the Piper on the as-found frequency could not be heard. After switching to the published CTAF frequency, the transmissions were heard.

NTSB review of recorded LiveATC.net audio for SEF for the period 1230 to 1300 revealed radio calls from the Diamond were heard for every leg of the airport traffic pattern prior to the collision; however, only 2 radio calls attributed to be from the Piper were heard. Both radio calls from the Piper were garbled and difficult to comprehend.