Flight Details
The accident involved a certified flight instructor (CFI) and a student pilot on a long night cross-country instructional flight back to their home airport. The flight followed a business meeting attended by the student pilot. Neither a formal weather briefing nor a flight plan was filed. Reported and forecast marginal visual flight rules (MVFR) conditions, along with areas of instrument meteorological conditions (IMC), prevailed along the intended route.
Radar Data
Recorded radar data showed the airplane generally flew at altitudes between 2,000 and 3,000 feet above mean sea level (msl), consistent with staying just below reported scattered to broken cloud layers. The flight path was nearly straight toward the destination. Radar coverage ended about 40 miles southeast of the accident site, when the airplane was at 2,200 feet msl, approximately 1,000 feet above the accident site elevation.
Witness and Crash Site
A witness living near the crash site reported hearing the airplane fly overhead with the engine sounding like it was at high power, followed by an impact sound. Examination of the crash site revealed the airplane collided with trees and terrain in a steep nose-down attitude at high velocity. The engine and forward portion of the airplane were embedded about four feet into the ground. The impact direction was nearly opposite the intended route of flight. The flaps and landing gear were retracted, consistent with cruise configuration.
Wreckage Examination
No evidence of preimpact mechanical malfunctions was found in the airframe, engine, or systems. Impact damage signatures were consistent with a loss of aircraft control while under engine power. The accident site was in remote, hilly terrain with very few lights.
Night Conditions and Pilot Factors
The accident occurred in dark night conditions with reduced visibility due to a low cloud ceiling and possible localized fog. The airplane likely entered IMC or conditions where the horizon was not visible, leading to a failure by the CFI and/or student pilot to maintain level flight. A loss of control possibly precipitated by spatial disorientation could not be determined due to lack of recorded radar or flight recorder data at the time of the accident. It also could not be determined who was manipulating the controls; however, the CFI was pilot-in-command.
Review of sleep patterns and duty day for both pilots indicated they were susceptible to fatigue based on sleep lengths in the 24 hours prior and time awake before the accident. Research shows fatigue can degrade performance and judgment, which likely impaired the CFI and student.