What happened
The incident occurred during a flight operation involving an approach at Frederick Regional Airport (FDK) in Maryland. The pilot was conducting a second attempt to intercept the localizer on the Instrument Landing System Runway 23 approach when a fuel issue arose. At this stage of the flight, the pilot communicated with Baltimore Air Route Traffic Control Center (ARTCC) to report a low fuel condition.
In response to the situation, air traffic control offered alternatives for an approach, suggesting either Baltimore/Washington International Thurgood Marshall Airport (BWI), located 34 miles to the southeast, or Washington Dulles International Airport (IAD), situated 25 miles to the southwest. A heading of 090 degrees was initially issued to direct the aircraft toward Baltimore.
Subsequently, the pilot informed ATC that one of the fuel tanks had become empty. Consequently, vectors were provided for a Non-Directional Beacon approach at Montgomery County Airpark (GAI) in Gaithersburg, Maryland. While approximately 3.5 miles northeast of Montgomery County Airpark, the pilot reported a total loss of engine power.
The time elapsed between the initial low fuel report and the declaration of total power failure was 19 minutes. Following the power loss, the aircraft crashed into a residential area located 2.5 miles northwest of Montgomery County Airpark.
The investigation
The investigation focused on the operational timeline and fuel management during the approach phase. Key findings included:
- The pilot's initial report of low fuel occurred while still attempting the ILS approach at Frederick.
- The transition from the initial approach to alternative airports involved significant distance and time.
- The confirmation that one tank was empty indicated a progressive depletion rather than an immediate total failure at the start of the distress call.
- The 19-minute interval between the first warning and total power loss suggests the aircraft was operating on reserve fuel during the vectoring phase.
Findings
The primary factor leading to the accident was the fuel exhaustion of the aircraft. The sequence of events indicates that the pilot continued flight operations after reporting low fuel, eventually depleting all available fuel reserves while being vectored for an approach at a different airport. The crash site in a residential area resulted from the inability to maintain altitude due to the lack of power.
Safety message
Pilots must recognize that a low fuel warning requires immediate action to land at the nearest suitable airport. Diverting to a distant airport after reporting low fuel can lead to critical fuel states if not managed with extreme caution and accurate endurance calculations.