On July 13, 2000, at 1500 central daylight time (CDT), a Cessna 152, N69066, piloted by a commercial pilot, was substantially damaged following a loss of control and subsequent nose-over during landing on runway 30 (3,100 feet by 60 feet, dry/asphalt), at the Park River W C Skjerven Field Airport (Y37), Park River, North Dakota. The flight was operating under the provisions of 14 CFR Part 91 and was not operating on a flight plan. Visual meteorological conditions prevailed at the time of the accident. The pilot reported no injuries. The flight departed the Grand Forks International Airport at 1350 CDT, with a planned destination of Y37. The pilot reported that during landing rollout the left brake had locked up and he could not control the aircraft with opposite rudder and/or braking. Postaccident investigation revealed black tire-skid marks, deposited from the right main and nose landing gear, leading up to the wreckage of the aircraft. The brakes, tires, and wheel assemblies were inspected and no anomalies were found. An operational test of the brake system was conducted and no anomalies were noted. No anomalies were found with the aircraft or its flight control systems that would preclude the normal operation of the aircraft. The pilot was given, by an inspector with the Federal Aviation Administration (FAA) Fargo Flight Standards District Office (FSDO), Fargo, North Dakota, a NTSB Form 6120.1/2 (Pilot/Operator Aircraft Accident Report) to complete on July 14, 2000. The pilot failed to return the completed form to the NTSB or Fargo FAA-FSDO office. The pilot was sent, by the NTSB Investigator-In-Charge (IIC), via first-class mail, a NTSB Form 6120.1/2 (Pilot/Operator Aircraft Accident Report) to complete on October 2, 2000. The pilot failed to return the completed form to the NTSB. The pilot was sent, by the NTSB Investigator-In-Charge (IIC), via certified mail, a NTSB Form 6120.1/2 (Pilot/Operator Aircraft Accident Report) to complete on February 27, 2000. The certified letter was never claimed and was returned unopened to the NTSB IIC.