What happened
On April 15, 2014, a Beechcraft V35B, registration TG-JOB, was performing an approach to the runway at the Puerto de San José aerodrome in the Escuintla Department of Guatemala. During communications with San José Tower, the pilot reported an electrical system malfunction.
As the aircraft prepared for landing, the pilot attempted to reset a tripped circuit breaker (C.B.) multiple times. This action resulted in a total loss of electrical power to the aircraft. Because the nose landing gear is electrically operated, the failure prevented the gear from extending properly. The pilot attempted to execute the emergency manual extension procedure; however, the nose gear failed to complete its extension cycle, leading to damage to the nose gear assembly upon touchdown.
The investigation
The DGAC/UIA investigation focused on the electrical system and the pilot's actions during the emergency. Investigators examined the aircraft's maintenance records, which showed that the engine, propeller, and airframe inspections were up to date.
Post-accident inspections of the aircraft's battery revealed a low voltage of approximately 8 volts. The investigation determined that the alternator contact switch had not been engaged, which prevented the alternator from maintaining the battery charge at the required 12 volts. Furthermore, the investigation noted that the pilot did not have the flight manual available during the flight to properly execute emergency procedures.