Accident Sequence
The aircraft, loaded with mail and freight within 57 pounds of its maximum takeoff weight, departed from a near-midfield intersection on runway 08L at 0622:35 local time. No malfunctions were noted during engine start or taxi. According to the pilot and a loader (who held a private pilot certificate), the takeoff proceeded normally until the aircraft reached about 100 feet above ground level. At that point, the airplane yawed sharply to the left, as if the left engine had lost power. Despite application of full right rudder, the pilot could not maintain directional control. To counteract severe yawing and rolling tendencies, the pilot reduced the pitch attitude. The left wingtip then struck the right side of the runway, causing the tricycle landing gear to collapse. The aircraft slid to a stop and was consumed by fire.
Seconds before the accident, a Boeing 747 had completed its landing rollout on runway 4R, which intersected runway 8L near its departure end. Winds were from 285 degrees at 2 knots.
Investigation Findings
Examination of both engines revealed no evidence of failure before impact. Propeller ground scars on the runway indicated that both engines were operating during the impact sequence. Due to extensive fire damage and a lack of accurate records, investigators could not determine the total fuel load, the actual weight of the freight, the preimpact location of the cargo within the aircraft, or whether the cargo tie-down system was adequate. Additionally, weight and balance documents filed with the Federal Aviation Administration (FAA) were inconsistent with "duplicate" documents held by the operator. The accident occurred during the pilot's final flight as an employee of the company.
Probable Cause
The official probable cause is loss of aircraft control for undetermined reason(s).